A pumped prestressed concrete pipe pile and its preparation method

Abstract

The present invention relates to the technical field of building materials, and more particularly to a kind of pumping prestressed concrete pipe pile and preparation method thereof. The components of the concrete pipe pile include liquid material and dry material; the liquid material includes the following raw material components: water reducer, slump retaining agent, defoamer, stabilizer, modifier, setting regulator, polymer emulsion, viscosity reducer, preservative, water; the dry material includes the following raw material components: Portland cement, glass powder, silica fume, glass sand, silicon dioxide-ceramic high-strength composite micropowder, ground sand, crushed stone, fiber, water. The present invention can improve the problems such as poor workability, large water secretion, large viscosity, low compressive strength, long setting time, etc. brought about when polycarboxylic acid additives and recycled glass materials are applied to the production of pumping prestressed concrete pipe piles, and make up for the defects such as reduced compressive strength of concrete and long setting time, so as to meet the provisions of relevant standards of concrete pipe piles and be relatively affordable.

Description

Technical Field

[0001] The present invention relates to the technical field of building materials, in particular to a pumping prestressed concrete pipe pile and a preparation method thereof. Background Art

[0002] As one of the main types of pipe piles, PHC pipe piles have the characteristics of high single pile bearing capacity, wide application range, reliable pile quality, relatively lower cost, convenient construction and low pollution. They have significant advantages in bearing capacity, quality and cost, and have been widely used in high-rise civil buildings, industrial plants, large equipment foundations, transportation infrastructure, municipal foundations and other projects.

[0003] As far as the existing public prestressed concrete pipe pile product formula is concerned, its components can be roughly divided into six types, namely cementitious materials, mineral aggregates, setting agents, rheological agents, modified components and other components. Among them, ordinary Portland cement, sulfoaluminate cement, high-alumina cement, fly ash, mineral powder and silica fume can be selected as cementitious materials for prestressed concrete pipe piles according to different functions to give the concrete superior compressive, flexural and bonding strengths. At the same time, the particle grading of prestressed concrete pipe piles requires the use of coarser aggregates (such as crushed stone, etc.) and fine aggregates (such as machine-made sand, river sand, fine sand and ground sand, etc.) in combination to achieve the best compaction effect. Prestressed concrete pipe piles can also add early strength agents and coagulants to improve the early cement setting strength, and retarders can also be used to slow down the gypsum setting rate to extend the operable time of prestressed concrete pipe piles. When redispersible rubber powder and emulsion act on prestressed concrete pipe piles, they can modify the concrete to form a strong polymer film, improve the fluidity, tensile strength and flexural strength of the concrete, and also reduce the elastic modulus and reduce the internal stress of the concrete system.

[0004] On the other hand, superplasticizers, defoamers and stabilizers are all rheological agent components in prestressed concrete pipe piles. Superplasticizers play a role in reducing water and preventing collapse in prestressed concrete pipe piles, thereby providing flow properties. The main function of defoamers in prestressed concrete pipe piles when added to the liquid material is to reduce the air content, improve the later strength of the concrete, and obtain a uniform, smooth and strong surface. A small amount of stabilizer (such as cellulose ether) can prevent the segregation of concrete and the formation of a skin, which will have a negative impact on the final surface performance. In addition, when there are special anti-cracking requirements during the construction of prestressed concrete pipe piles, an appropriate amount of fiber will also be added to improve the crack resistance of the concrete and reduce and inhibit the occurrence of various cracks.

[0005] Existing literature and successful cases demonstrate the rich sources of raw materials for prestressed concrete piles. Currently, various aggregates, including machine-made sand, river sand, quartz sand, stone powder, and ceramic powder, can be used to prepare prestressed concrete piles, with machine-made sand being the most common. With the increasing availability of various raw material sources and in-depth research into related formulation technologies, recycled glass, as a recyclable raw material, is becoming an emerging research direction for prestressed concrete piles due to its stable acid and alkali resistance, chemical inertness, and low coefficient of expansion.

[0006] Literature confirms that recycled glass has a small particle size, good dispersibility, high transparency, and excellent anti-settling properties. It also has good compatibility and strong steric hindrance, making it easily dispersed in concrete systems. After forming a film, it can increase the volume of concrete and reduce its viscosity, while maintaining clear transparency and providing good scratch resistance. However, tests have shown that the use of recycled glass in prestressed concrete piles suffers from low compressive strength, high water exudation, and prolonged setting time. This is because, while recycled glass has a better gradation, its surface morphology is relatively smooth, and its reactivity with cement is lower than that of mineral powder. This weakens the bonding between the cementitious material and the aggregate, and prolongs the time required for the cement particles in the concrete system to connect and form a skeleton structure.

[0007] On the other hand, with regard to the existing production processes and additives used in prestressed concrete pipe piles, the production processes are mainly divided into open-mold non-pump processes and closed-mold pumping processes, and the additives used are mainly divided into naphthalene-based additives and polycarboxylic acid additives. The open-mold non-pump process and the use of naphthalene-based additives are traditional methods for producing prestressed concrete pipe piles. They feature good concrete workability, low sensitivity, and high process maturity, but also have issues such as high production costs, high pollution, easy crystallization in winter, and an inability to produce higher-grade pipe pile concrete. In contrast, when polycarboxylic acid additives are used in the open-mold non-pump process and closed-mold pumping process, they offer advantages such as low production costs, high construction efficiency, good additive homogeneity, and the ability to produce higher-grade pipe pile concrete. However, it should be noted that in order to achieve the designed ultra-high strength, the water-cement ratio and sand ratio of ultra-high-strength pipe pile concrete are low, and the formula of its supporting polycarboxylic acid additive product cannot add air-entraining agent to improve the workability of concrete. In addition, when using the mold pumping process to produce ultra-high-strength concrete pipe piles, the concrete is required to ensure a large flow state to reduce pump pressure and improve production efficiency. This leads to the situation that when polycarboxylic acid additives are used to pump ultra-high-strength concrete pipe piles, the concrete is prone to problems such as poor workability, large water exudation, and high sensitivity.

[0008] In summary, while recycled glass has a good gradation as a recyclable raw material, its use in prestressed concrete piles presents challenges such as low compressive strength, high water exudation, and prolonged setting time. Polycarboxylic acid additives, when used in both open-mold non-pumping and closed-mold pumping processes, offer advantages such as low production costs, high construction efficiency, good additive homogeneity, and the ability to produce higher-grade concrete for piles. However, when used in pumping ultra-high-strength concrete piles, these additives can lead to poor workability, high water exudation, and increased sensitivity.

[0009] How to improve the problems of poor workability, large water seepage, high viscosity, low compressive strength, and long setting time caused by the application of polycarboxylic acid additives and recycled glass materials in the production of pumped prestressed concrete pipe piles, so that the prepared pumped prestressed concrete pipe piles comply with the provisions of relevant standards such as JGJ / T 406 "Technical Standard for Prestressed Concrete Pipe Piles", GB 50081 "Test Methods for Physical and Mechanical Properties of Concrete" and GB 13476 "Pre-tensioned Prestressed Concrete Pipe Piles" is exactly the problem that technical personnel in this field are committed to solving. Summary of the Invention

[0010] In order to solve the problems mentioned in the above background technology, the present invention provides a pumped prestressed concrete pipe pile that is environmentally friendly, pollution-free, and has good working performance. The technical solution is as follows:

[0011] The pumped prestressed concrete pipe pile comprises components including liquid material and dry material; the liquid material comprises the following raw material components: a water reducer, a slump retaining agent, a defoamer, a stabilizer, a modifier, a setting regulator, a polymer emulsion, a viscosity reducer, a preservative, and water; the dry material comprises the following raw material components: silicate cement, glass powder, silica fume, glass sand, silica-ceramic high-strength composite micropowder, ground sand, crushed stone, fiber, and water; wherein the polymer emulsion is a silicone-modified styrene and acrylate copolymer; the modifier is a potassium lignin sulfonate-butenoic acid-maleic anhydride grafted multipolymer; and the raw material components of the silica-ceramic high-strength composite micropowder comprise: fused mullite, plate-shaped corundum, pure calcium aluminate cement, ceramic micropowder, methyl propylene p-methylphenyl silicone rubber, triallyl isocyanurate, fumed silica, butene-1-decene copolymer, calcium polyacrylate, hydroxybutyl distarch phosphate, and silica fume.

[0012] In one embodiment, the liquid material includes the following raw material components, calculated by mass: 10-30 parts of water reducer, 2-10 parts of slump retaining agent, 0.1-1 part of defoaming agent, 0.1-3 parts of stabilizer, 1-10 parts of modifier, 1-10 parts of setting regulator, 10-30 parts of polymer emulsion, 0.5-5 parts of viscosity reducer, 1-5 parts of preservative, and 10-500 parts of water;

[0013] The dry material comprises the following raw material components: 30-60 parts of Portland cement, 5-10 parts of glass powder, 2-15 parts of silica fume, 45-65 parts of glass sand, 5-20 parts of silica-ceramic high-strength composite micropowder, 3-20 parts of ground sand, 80-130 parts of crushed stone, 0.5-2 parts of fiber, and 10-20 parts of water;

[0014] The raw material components of the silica-ceramic high-strength composite micropowder include: 10-30 parts of fused mullite, 5-25 parts of plate-shaped corundum, 1-15 parts of pure calcium aluminate cement, 30-100 parts of ceramic micropowder, 10-30 parts of methyl propylene p-methylphenyl silicone rubber, 1-7 parts of triallyl isocyanurate, 30-100 parts of fumed silica, 1-15 parts of butene-1-decene copolymer, 1-8 parts of calcium polyacrylate, 1-3 parts of hydroxybutyl distarch phosphate, and 3-20 parts of silica fume;

[0015] Wherein, the mass ratio of the liquid material to the dry material is (0.3-2):(100-500).

[0016] In one embodiment, the preparation process of the silica-ceramic high-strength composite micropowder is as follows: weigh each raw material component according to a certain weight portion, mix and grind until the fineness of the mixed powder is (170-270) mesh.

[0017] In one embodiment, the polymer emulsion is prepared by a pre-emulsification method, and the preparation process is as follows:

[0018] Add the first part of the composite emulsifier to a certain amount of water, stir and dissolve, to prepare solution A;

[0019] Adding butyl acrylate, styrene and acrylic acid monomer to the solution A, stirring and mixing to form a pre-emulsion;

[0020] Dissolve the initiator potassium persulfate in a certain amount of water to prepare an initiator solution;

[0021] Add sodium bicarbonate, water and the second part of the composite emulsifier into a reaction vessel, stir and dissolve, then heat to (50-70)°C, add the first part of the initiator solution, and add the first part of the pre-emulsion within (20-40) minutes, and keep the temperature at (75-80)°C to react until the liquid turns blue;

[0022] Add vinyltriethoxysilane to the second part of the pre-emulsion and mix them. Add the pre-emulsion and the second part of the initiator solution into the reaction vessel within (2-3) hours, then keep warm at (75-80)°C for (1-2) hours, cool to below (20-40)°C, adjust the pH to 7-8, and filter to obtain the product.

[0023] In one embodiment, the sum of the amounts of the first part of the composite emulsifier and the second part of the composite emulsifier is the total amount of the composite emulsifier; the mass ratio of the first part of the composite emulsifier to the second part of the composite emulsifier is (2-6):(0.5-2);

[0024] The sum of the amounts of the first part of the initiator solution and the second part of the initiator solution is the total amount of the initiator solution;

[0025] The sum of the amounts of the first part of the pre-emulsion and the second part of the pre-emulsion is the total amount of the pre-emulsion; the mass ratio of the first part of the pre-emulsion to the second part of the pre-emulsion is (0.5-1.5):(2-6);

[0026] The raw material components of the composite emulsifier include nonylphenol polyoxyethylene ether and sodium lauryl sulfate, and the mass ratio of nonylphenol polyoxyethylene ether to sodium lauryl sulfate is 5:1 to 2:1;

[0027] The mass fraction of the composite emulsifier in the total amount of the pre-emulsion is 3% to 5%, the mass fraction of vinyltriethoxysilane in the total amount of the pre-emulsion is 2% to 6%, and the mass fractions of butyl acrylate, styrene, and acrylic acid monomer in the total amount of the pre-emulsion are 10% to 40%, 15% to 40%, and 1% to 10%, respectively.

[0028] In one embodiment, the preparation process of the modifier is:

[0029] Potassium lignin sulfonate, crotonic acid and maleic anhydride were added to the reactor, and the pH value of the reaction system was adjusted to 2-5. (Ⅱ) Under the action of H2O2, the graft copolymerization reaction is carried out at a reaction temperature of (50-90) ° C for (2-5) hours. After the reaction is completed, impurities are removed and purified to obtain;

[0030] Wherein, the potassium lignin sulfonate, butenoic acid, maleic anhydride, Fe (Ⅱ) The mass ratio of H2O2 is 100:(15~40):(5~30):(1~8):(2~10).

[0031] In one embodiment, the viscosity reducer is prepared from 1,3-dihydro-1,3-dioxo-5-isobenzofuranoic acid, a polyol compound, N-(1,1-dimethyl-3-oxobutyl) acrylamide, 2,2-dimethoxypropane, butynediol monopropoxy ether, 2-hydroxyethyl acrylate, polyphosphate, and 15-crown ether-5 by polymerization reaction under the action of a catalyst:

[0032] The molar ratio of 1,3-dihydro-1,3-dioxo-5-isobenzofuranoic acid, polyol compound, N-(1,1-dimethyl-3-oxobutyl)acrylamide, 2,2-dimethoxypropane, butynediol monopropoxy ether, 2-hydroxyethyl acrylate, polyphosphate, and 15-crown ether-5 is 1:(1-3):(1-5):(1-4):(1-3):(1-5):(1-4):(1-3);

[0033] The polyol compound is one or more combinations of 2,2-bishydroxymethyl-1,3-propanediol and 2,4,7,9-tetramethyl-5-decyne-4,7-diol; and the catalyst is one or more combinations of hydrogen peroxide, concentrated sulfuric acid and concentrated nitric acid.

[0034] In one embodiment, the viscosity reducer is prepared as follows: a polyol compound and N-(1,1-dimethyl-3-oxobutyl)acrylamide are added to a reactor, the system temperature is controlled at 25° C. to 45° C., and the mixture is stirred and mixed; then 1,3-dihydro-1,3-dioxo-5-isobenzofuranoic acid is added, and then the first portion of the catalyst is added, and the mixture is reacted at 30° C. to 50° C. for 3 to 4 hours;

[0035] Continue to add polyphosphate, 15-crown ether-5, and the second part of the catalyst, control the system temperature at 45°C to 65°C, and react at this temperature for 20 to 24 hours;

[0036] Continue to add 2,2-dimethoxypropane, butynediol monopropoxy ether and 2-hydroxyethyl acrylate, and the third part of the catalyst, react at 40°C to 70°C for (15 to 25) hours, and cool to room temperature to obtain;

[0037] The amount of the catalyst is the sum of the amounts of the first part of the catalyst, the second part of the catalyst and the third part of the catalyst; the amount of the first part of the catalyst accounts for 0.1% to 1.0% of the total mass of the polyol compound, N-(1,1-dimethyl-3-oxobutyl) acrylamide and 1,3-dihydro-1,3-dioxo-5-isobenzofuranoic acid; the amount of the second part of the catalyst accounts for 0.2% to 3.0% of the total mass of the polyphosphate and 15-crown ether-5; and the amount of the third part of the catalyst accounts for 0.1% to 3.0% of the total mass of 2,2-dimethoxypropane, butynediol monopropoxy ether and 2-hydroxyethyl acrylate.

[0038] In one embodiment, the water reducing agent and slump retaining agent are polycarboxylic acid grafted multi-polymers;

[0039] And / or, the defoaming agent is a polysiloxane organic compound;

[0040] And / or, the stabilizer is one or more combinations of Brunei gum, diutan gum, nanocellulose, xanthan gum, and hydroxyethyl cellulose;

[0041] And / or, the setting agent includes a reinforcing agent and a coagulant, wherein the reinforcing agent is one or more combinations of calcium nitrate, sodium sulfate, triethanolamine, and nanocrystalline core reinforcing agent; the coagulant is one or more combinations of calcium fluoroaluminate, sodium thiocyanate, lithium sulfate, and potassium silicate;

[0042] And / or, the preservative is potassium 2,4-hexadienoate;

[0043] And / or, the Portland cement is 52.5 grade ordinary Portland cement;

[0044] And / or, the mesh number of the glass powder is (170-270);

[0045] And / or, the mesh number of the glass sand is (70-140);

[0046] And / or, the particle size of the crushed stone is (5-25) mm;

[0047] And / or, the fiber is polypropylene fiber.

[0048] The present invention also provides a method for preparing the pumped prestressed concrete pipe pile as described above, which comprises the following preparation steps:

[0049] Weighing and mixing the raw material components of the dry material to prepare the dry material;

[0050] Weighing and mixing the raw material components of the liquid material to prepare the liquid material;

[0051] The liquid material and the dry material are weighed and mixed, and the mixture is stirred evenly, and then the mold is closed, the material is pumped, and the centrifugal molding is performed; and the centrifugally molded pipe pile is steamed and autoclaved for curing, and finally formed to obtain the product.

[0052] Compared with the existing technology, the present invention has the following technical effects:

[0053] The present invention can improve the problems of poor workability, large water exudation, high viscosity, low compressive strength, and long setting time caused by the application of polycarboxylic acid additives and recycled glass materials in the production of pumped prestressed concrete pipe piles, and compensate for the defects of reduced concrete compressive strength and long setting time caused by the use of recycled glass materials instead of mineral powder, so that the prepared pumped prestressed concrete pipe piles meet the requirements of relevant standards and are relatively affordable. In addition, the scheme of the present invention can enrich the source of raw materials for prestressed concrete pipe piles and improve the utilization rate of solid waste building materials while ensuring the working performance of the prestressed concrete pipe piles. DETAILED DESCRIPTION

[0054] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the following will be described clearly and completely in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0055] The present invention provides an operational example of a method for preparing a pumped prestressed concrete pipe pile, which includes the following preparation steps:

[0056] Step 1, weighing and mixing the raw material components of the dry material to prepare the dry material;

[0057] Step 2: Weigh and mix the raw material components of the liquid material to obtain the liquid material;

[0058] Step 3: Weigh the liquid material and the dry material, mix them, stir them evenly, close the mold, pump the materials, and centrifuge them; and steam and autoclave the centrifugally formed pipe piles to finally form them.

[0059] The raw material formula of concrete pipe pile is:

[0060] The liquid material includes the following raw material components by mass: 10-30 parts of water reducing agent, 2-10 parts of slump retaining agent, 0.1-1 part of defoaming agent, 0.1-3 parts of stabilizer, 1-10 parts of modifier, 1-10 parts of setting regulator, 10-30 parts of polymer emulsion, 0.5-5 parts of viscosity reducer, 1-5 parts of preservative, and 10-500 parts of water;

[0061] The dry material includes the following raw material components: 30-60 parts of silicate cement, 5-10 parts of glass powder, 2-15 parts of silica fume, 45-65 parts of glass sand, 5-20 parts of silicon dioxide-ceramic high-strength composite micropowder, 3-20 parts of ground sand, 80-130 parts of crushed stone, 0.5-2 parts of fiber, and 10-20 parts of water.

[0062] Wherein, the mass ratio of the liquid material to the dry material is (0.3-2):(100-500).

[0063] For the selection of raw materials for each component:

[0064] 1.Silica-ceramic high-strength composite micropowder

[0065] The raw material components of the silica-ceramic high-strength composite micropowder include, by weight, 10-30 parts of fused mullite, 5-25 parts of plate-shaped corundum, 1-15 parts of pure calcium aluminate cement, 30-100 parts of ceramic micropowder, 10-30 parts of methyl acrylate-p-methylphenyl silicone rubber, 1-7 parts of triallyl isocyanurate, 30-100 parts of fumed silica, 1-15 parts of butene-1-decene copolymer, 1-8 parts of calcium polyacrylate, 1-3 parts of hydroxybutyl distarch phosphate, and 3-20 parts of silica fume. The preparation process is as follows: weighing the above raw material components in certain parts by weight, mixing and grinding until the fineness of the mixed powder is (170-270) mesh.

[0066] 2. Polymer emulsion

[0067] The polymer emulsion is a silicone-modified styrene and acrylate copolymer (also known as silicone-styrene-acrylate ternary copolymer in the text), and its synthesis process is preferably implemented as follows:

[0068] Step 1: Add the first part of the composite emulsifier into a certain amount of deionized water and stir to dissolve;

[0069] Step 2: Then add butyl acrylate, styrene, and acrylic acid monomer, and stir vigorously for a certain period of time to prepare a pre-emulsion;

[0070] Step 3: Dissolve the initiator potassium persulfate in an appropriate amount of water to prepare an initiator solution.

[0071] Step 4: In a 250 mL four-necked flask equipped with a reflux condenser, an electric stirrer, a constant pressure dropping funnel, and a thermometer, add an appropriate amount of sodium bicarbonate, deionized water, and the second part of the composite emulsifier, stir and dissolve, raise the temperature to (50-70) ° C, add the first part of the initiator solution, add the first part of the pre-emulsion dropwise within (20-40) min, and keep the temperature at (75-80) ° C to react until the liquid turns blue;

[0072] Step 5: Mix vinyltriethoxysilane into the second part of the pre-emulsion, and drop the pre-emulsion and the second part of the initiator solution into the flask within (2-3) hours. After the addition is completed, keep the temperature for reaction for (1-2) hours, cool from (75-80)°C to below (20-40)°C, adjust the pH value to 7-8 with ammonia water, filter and store.

[0073] The sum of the amounts of the first part of the composite emulsifier and the second part of the composite emulsifier is the total amount of the composite emulsifier; the mass ratio of the first part of the composite emulsifier to the second part of the composite emulsifier is (2-6):(0.5-2); the sum of the amounts of the first part of the initiator solution and the second part of the initiator solution is the total amount of the initiator solution; the sum of the amounts of the first part of the pre-emulsion and the second part of the pre-emulsion is the total amount of the pre-emulsion; the mass ratio of the first part of the pre-emulsion to the second part of the pre-emulsion is (0.5-1.5):(2-6);

[0074] The raw material components of the composite emulsifier include nonylphenol polyoxyethylene ether and sodium lauryl sulfate, and the mass ratio of the nonylphenol polyoxyethylene ether to sodium lauryl sulfate is 5:1 to 2:1; the mass fraction of the composite emulsifier in the total amount of the pre-emulsion is 3% to 5%, the mass fraction of vinyl triethoxysilane in the total amount of the pre-emulsion is 2% to 6%, and the mass fractions of butyl acrylate, styrene, and acrylic acid monomer in the total amount of the pre-emulsion are 10% to 40%, 15% to 40%, and 1% to 10%, respectively.

[0075] 3. Modifier

[0076] The modifier is a potassium lignin sulfonate-butenoic acid-maleic anhydride grafted multipolymer, and the preferred embodiment of its synthesis process is:

[0077] Potassium lignin sulfonate, crotonic acid and maleic anhydride were added to the reactor, and the pH value of the reaction system was adjusted to 2-5. (Ⅱ) and H2O2, at a reaction temperature of (50-90) ° C, carry out graft copolymerization reaction for (2-5) h, remove impurities and purify after the reaction, and obtain; wherein the potassium lignin sulfonate, butenoic acid, maleic anhydride, Fe (Ⅱ) The mass ratio of H2O2 is 100:(15~40):(5~30):(1~8):(2~10).

[0078] 4. Viscosity reducer

[0079] The preferred embodiment of the synthesis process of the viscosity reducer is:

[0080] Step 1: Add a polyol compound and N-(1,1-dimethyl-3-oxobutyl)acrylamide to a reactor, control the system temperature at 25°C to 45°C, and stir to mix; then add 1,3-dihydro-1,3-dioxo-5-isobenzofuranoic acid, and then add the first part of the catalyst, and react at 30°C to 50°C for 3 to 4 hours;

[0081] Step 2: Continue to add polyphosphate, 15-crown ether-5, and the second part of the catalyst, control the system temperature at 45°C to 65°C, and react at this temperature for 20 to 24 hours;

[0082] Step 3, continue to add 2,2-dimethoxypropane, butynediol monopropoxy ether and 2-hydroxyethyl acrylate, and the third part of the catalyst, react at 40°C to 70°C for (15 to 25) hours, and cool to room temperature to obtain;

[0083] Among them, the molar ratio of 1,3-dihydro-1,3-dioxo-5-isobenzofuranoic acid, polyol compound, N-(1,1-dimethyl-3-oxobutyl)acrylamide, 2,2-dimethoxypropane, butynediol monopropoxy ether, 2-hydroxyethyl acrylate, polyphosphate, and 15-crown ether-5 is 1:(1-3):(1-5):(1-4):(1-3):(1-5):(1-4):(1-3); the polyol compound is one or more combinations of 2,2-bishydroxymethyl-1,3-propanediol and 2,4,7,9-tetramethyl-5-decyn-4,7-diol; and the catalyst is one or more combinations of hydrogen peroxide, concentrated sulfuric acid, and concentrated nitric acid.

[0084] The amount of the catalyst is the sum of the amounts of the first part of the catalyst, the second part of the catalyst and the third part of the catalyst; the amount of the first part of the catalyst accounts for 0.1% to 1.0% of the total mass of the polyol compound, N-(1,1-dimethyl-3-oxobutyl) acrylamide and 1,3-dihydro-1,3-dioxo-5-isobenzofuranoic acid; the amount of the second part of the catalyst accounts for 0.2% to 3.0% of the total mass of the polyphosphate and 15-crown ether-5; and the amount of the third part of the catalyst accounts for 0.1% to 3.0% of the total mass of 2,2-dimethoxypropane, butynediol monopropoxy ether and 2-hydroxyethyl acrylate.

[0085] The present invention also provides the formulas of the embodiments and comparative examples shown in Tables 1-4 (unit: parts by weight):

[0086] Table 1

[0087]

[0088]

[0089] Table 2

[0090]

[0091]

[0092] Table 3

[0093]

[0094]

[0095] Table 4

[0096]

[0097]

[0098] The present invention provides the above-mentioned embodiment and comparative example specific preparation process is:

[0099] Embodiment 1:

[0100] The liquid and dry materials of the pumped prestressed concrete piles were prepared in the following proportions: 130 kg of water reducer, 50 kg of slump retaining agent, 3 kg of polysiloxane organic matter, 5 kg of hydroxyethyl cellulose, 30 kg of potassium lignin sulfonate-crotonic acid-maleic anhydride grafted multipolymer, 20 kg of triethanolamine, 30 kg of lithium sulfate, 200 kg of organosilicon-styrene-acrylate ternary copolymer, 30 kg of alcohol-ester-ether-phosphoric acid-amide multipolymer derivative, 15 kg of potassium 2,4-hexadienoate, and 487 kg of water.

[0101] Dry material part: 400kg of 52.5 grade ordinary Portland cement, 75kg of 200 mesh glass powder, 95kg of silica fume, 550kg of (70-140) mesh glass sand, 120kg of 200 mesh silica-ceramic high-strength composite micropowder, 90kg of ground sand, 1150kg of (5-25) mm crushed stone, 10kg of polypropylene fiber, and 150kg of water.

[0102] After preparing the liquid and dry materials, 12 kg of liquid and 2650 kg of dry materials were mixed and stirred evenly, then molded, pumped, and centrifugally formed. The centrifugally formed pipe piles were steamed and autoclaved before finally forming. The C115 pumpable prestressed concrete pipe pile products were thus obtained. Their performance was tested and compared with that of a competing product (a certain brand of high-performance water reducer specially used for early-strength prestressed high-strength concrete pipe piles).

[0103] Example 2:

[0104] The liquid and dry materials of the pumped prestressed concrete pipe piles were prepared in the following proportions: 130 kg of water reducer, 50 kg of slump retaining agent, 3 kg of polysiloxane organic matter, 3 kg of nanocellulose, 6 kg of Brunei gum, 30 kg of potassium lignin sulfonate-butenoic acid-maleic anhydride grafted multipolymer, 10 kg of calcium nitrate, 15 kg of sodium sulfate, 30 kg of calcium fluoroaluminate, 200 kg of organosilicon-styrene-acrylate ternary copolymer latex, 30 kg of alcohol-ester-ether-phosphoric acid-amide multipolymer derivative, 15 kg of potassium 2,4-hexadienoate, and 478 g of water.

[0105] Dry material part: 400kg of 52.5 grade ordinary Portland cement, 75kg of 200 mesh glass powder, 95kg of silica fume, 600kg of (70-140) mesh glass sand, 110kg of 200 mesh silica-ceramic high-strength composite micropowder, 60kg of ground sand, 1150kg of (5-25) mm crushed stone, 10kg of polypropylene fiber, and 150kg of water.

[0106] After preparing the liquid and dry materials, 12 kg of liquid and 2650 kg of dry materials were mixed and stirred evenly, then molded, pumped, and centrifugally formed. The centrifugally formed pipe piles were steamed and autoclaved before finally forming. The C115 pumpable prestressed concrete pipe pile products were thus obtained. Their performance was tested and compared with that of a competing product (a certain brand of high-performance water reducer specially used for early-strength prestressed high-strength concrete pipe piles).

[0107] Example 3:

[0108] The liquid and dry materials of the pumped prestressed concrete piles were prepared in the following proportions: 130 kg of water reducer, 50 kg of slump retaining agent, 3 kg of polysiloxane organic matter, 5 kg of dimethicone, 5 kg of xanthan gum, 30 kg of potassium ligninsulfonate-crotonic acid-maleic anhydride grafted multipolymer, 30 kg of nanocrystalline core enhancer, 30 kg of sodium thiocyanate, 200 kg of organosilicon-styrene-acrylate ternary copolymer, 30 kg of alcohol-ester-ether-phosphoric acid-amide multipolymer derivative, 15 kg of potassium 2,4-hexadienoate, and 472 kg of water.

[0109] Dry material part: 400kg of 52.5 grade ordinary Portland cement, 75kg of 200 mesh glass powder, 95kg of silica fume, 600kg of (70-140) mesh glass sand, 110kg of 200 mesh silica-ceramic high-strength composite micropowder, 60kg of ground sand, 1150kg of (5-25) mm crushed stone, 10kg of polypropylene fiber, and 150kg of water.

[0110] After preparing the liquid and dry materials, 12 kg of liquid and 2650 kg of dry materials were mixed and stirred evenly, then molded, pumped, and centrifugally formed. The centrifugally formed pipe piles were steamed and autoclaved before finally forming. The C115 pumpable prestressed concrete pipe pile products were thus obtained. Their performance was tested and compared with that of a competing product (a certain brand of high-performance water reducer specially used for early-strength prestressed high-strength concrete pipe piles).

[0111] Embodiment 4:

[0112] The liquid and dry materials of the pumped prestressed concrete piles were prepared in the following proportions: 130 kg of water reducer, 50 kg of slump retaining agent, 3 kg of polysiloxane organic matter, 5 kg of xanthan gum, 5 kg of Brunei gum, 30 kg of potassium lignin sulfonate-butenoic acid-maleic anhydride grafted multipolymer, 15 kg of sodium sulfate, 20 kg of nanocrystalline core reinforcing agent, 30 kg of potassium silicate, 200 kg of organosilicon-styrene-acrylate ternary copolymer, 30 kg of alcohol-ester-ether-phosphoric acid-amide multipolymer derivative, 15 kg of potassium 2,4-hexadienoate, and 467 kg of water.

[0113] Dry material part: 400kg of 52.5 grade ordinary Portland cement, 75kg of 200 mesh glass powder, 95kg of silica fume, 600kg of (70-140) mesh glass sand, 110kg of 200 mesh silica-ceramic high-strength composite micropowder, 60kg of ground sand, 1150kg of (5-25) mm crushed stone, 10kg of polypropylene fiber, and 150kg of water.

[0114] After preparing the liquid and dry materials, 12 kg of liquid and 2650 kg of dry materials were mixed and stirred evenly, then molded, pumped, and centrifugally formed. The centrifugally formed pipe piles were steamed and autoclaved before finally forming. The C115 pumpable prestressed concrete pipe pile products were thus obtained. Their performance was tested and compared with that of a competing product (a certain brand of high-performance water reducer specially used for early-strength prestressed high-strength concrete pipe piles).

[0115] Comparative Example 1:

[0116] The liquid and dry materials of the pumped prestressed concrete piles were prepared in the following proportions: 130 kg of water reducer, 50 kg of slump retaining agent, 3 kg of polysiloxane organic matter, 5 kg of hydroxyethyl cellulose, 30 kg of potassium lignin sulfonate-crotonic acid-maleic anhydride grafted multipolymer, 20 kg of triethanolamine, 30 kg of lithium sulfate, 200 kg of organosilicon-styrene-acrylate ternary copolymer, 30 kg of alcohol-ester-ether-phosphoric acid-amide multipolymer derivative, 15 kg of potassium 2,4-hexadienoate, and 487 kg of water.

[0117] Dry material part: 400kg of 52.5 grade ordinary Portland cement, 75kg of 200 mesh glass powder, 95kg of silica fume, 400kg of (70-140) mesh glass sand, 200kg of 200 mesh silica-ceramic high-strength composite micropowder, 170kg of ground sand, 1150kg of (5-25) mm crushed stone, 10kg of polypropylene fiber, and 150kg of water.

[0118] After preparing the liquid and dry materials, 12 kg of liquid and 2650 kg of dry materials were mixed and stirred evenly, then molded, pumped, and centrifugally formed. The centrifugally formed pipe piles were steamed and autoclaved before finally forming. The C115 pumpable prestressed concrete pipe pile products were thus obtained. Their performance was tested and compared with that of a competing product (a certain brand of high-performance water reducer specially used for early-strength prestressed high-strength concrete pipe piles).

[0119] Comparative Example 2:

[0120] The liquid and dry materials of the pumped prestressed concrete piles were prepared in the following proportions: 130 kg of water reducer, 50 kg of slump retaining agent, 3 kg of polysiloxane organic matter, 5 kg of hydroxyethyl cellulose, 30 kg of potassium lignin sulfonate-crotonic acid-maleic anhydride grafted multipolymer, 20 kg of triethanolamine, 30 kg of lithium sulfate, 200 kg of organosilicon-styrene-acrylate ternary copolymer, 30 kg of alcohol-ester-ether-phosphoric acid-amide multipolymer derivative, 15 kg of potassium 2,4-hexadienoate, and 487 kg of water.

[0121] Dry material part: 400kg of 52.5 grade ordinary Portland cement, 75kg of 200 mesh glass powder, 95kg of silica fume, 680kg of (70-140) mesh glass sand, 50kg of 200 mesh silica-ceramic high-strength composite micropowder, 40kg of ground sand, 1150kg of (5-25) mm crushed stone, 10kg of polypropylene fiber, and 150kg of water.

[0122] After preparing the liquid and dry materials, 12 kg of liquid and 2650 kg of dry materials were mixed and stirred evenly, then molded, pumped, and centrifugally formed. The centrifugally formed pipe piles were steamed and autoclaved before finally forming. The C115 pumpable prestressed concrete pipe pile products were thus obtained. Their performance was tested and compared with that of a competing product (a certain brand of high-performance water reducer specially used for early-strength prestressed high-strength concrete pipe piles).

[0123] Comparative Example 3:

[0124] The liquid and dry materials of the pumped prestressed concrete piles were prepared in the following proportions: 130 kg of water reducer, 50 kg of slump retaining agent, 3 kg of polysiloxane organic matter, 5 kg of hydroxyethyl cellulose, 30 kg of potassium lignin sulfonate-crotonic acid-maleic anhydride grafted multipolymer, 20 kg of triethanolamine, 30 kg of lithium sulfate, 200 kg of organosilicon-styrene-acrylate ternary copolymer, 30 kg of alcohol-ester-ether-phosphoric acid-amide multipolymer derivative, 15 kg of potassium 2,4-hexadienoate, and 487 kg of water.

[0125] Dry material part: 400kg of 52.5 grade ordinary Portland cement, 75kg of 200 mesh glass powder, 95kg of silica fume, 650kg of (70-140) mesh glass sand, 20kg of 200 mesh silica-ceramic high-strength composite micropowder, 80kg of ground sand, 1150kg of (5-25) mm crushed stone, 10kg of polypropylene fiber, and 150kg of water.

[0126] After preparing the liquid and dry materials, 12 kg of liquid and 2650 kg of dry materials were mixed and stirred evenly, then molded, pumped, and centrifugally formed. The centrifugally formed pipe piles were steamed and autoclaved before finally forming. The C115 pumpable prestressed concrete pipe pile products were thus obtained. Their performance was tested and compared with that of a competing product (a certain brand of high-performance water reducer specially used for early-strength prestressed high-strength concrete pipe piles).

[0127] Comparative Example 4:

[0128] The liquid and dry materials of the pumped prestressed concrete piles were prepared in the following proportions: 130 kg of water reducer, 50 kg of slump retaining agent, 3 kg of polysiloxane organic matter, 5 kg of hydroxyethyl cellulose, 30 kg of potassium lignin sulfonate-crotonic acid-maleic anhydride grafted multipolymer, 20 kg of triethanolamine, 30 kg of lithium sulfate, 200 kg of organosilicon-styrene-acrylate ternary copolymer, 30 kg of alcohol-ester-ether-phosphoric acid-amide multipolymer derivative, 15 kg of potassium 2,4-hexadienoate, and 487 kg of water.

[0129] Dry material part: 400kg of 52.5 grade ordinary Portland cement, 75kg of 200 mesh glass powder, 95kg of silica fume, 490kg of (70-140) mesh glass sand, 230kg of 200 mesh silica-ceramic high-strength composite micropowder, 50kg of ground sand, 1150kg of (5-25) mm crushed stone, 10kg of polypropylene fiber, and 150kg of water.

[0130] After preparing the liquid and dry materials, 12 kg of liquid and 2650 kg of dry materials were mixed and stirred evenly, then molded, pumped, and centrifugally formed. The centrifugally formed pipe piles were steamed and autoclaved before finally forming. The C115 pumpable prestressed concrete pipe pile products were thus obtained. Their performance was tested and compared with that of a competing product (a certain brand of high-performance water reducer specially used for early-strength prestressed high-strength concrete pipe piles).

[0131] Comparative Example 5:

[0132] The liquid and dry materials of the pumped prestressed concrete piles were prepared in the following proportions: 130 kg of water reducer, 50 kg of slump retaining agent, 3 kg of polysiloxane organic matter, 5 kg of hydroxyethyl cellulose, 30 kg of potassium lignin sulfonate-crotonic acid-maleic anhydride grafted multipolymer, 20 kg of triethanolamine, 30 kg of lithium sulfate, 200 kg of organosilicon-styrene-acrylate ternary copolymer, 30 kg of alcohol-ester-ether-phosphoric acid-amide multipolymer derivative, 15 kg of potassium 2,4-hexadienoate, and 487 kg of water.

[0133] Dry material part: 430kg of 52.5 grade ordinary Portland cement, 30kg of 200 mesh glass powder, 110kg of silica fume, 600kg of (70-140) mesh glass sand, 110kg of 200 mesh silica-ceramic high-strength composite micropowder, 60kg of ground sand, 1150kg of (5-25) mm crushed stone, 10kg of polypropylene fiber, and 150kg of water.

[0134] After preparing the liquid and dry materials, 12 kg of liquid and 2650 kg of dry materials were mixed and stirred evenly, then molded, pumped, and centrifugally formed. The centrifugally formed pipe piles were steamed and autoclaved before finally forming. The C115 pumpable prestressed concrete pipe pile products were thus obtained. Their performance was tested and compared with that of a competing product (a certain brand of high-performance water reducer specially used for early-strength prestressed high-strength concrete pipe piles).

[0135] Comparative Example 6:

[0136] The liquid and dry materials of the pumped prestressed concrete piles were prepared in the following proportions: 130 kg of water reducer, 50 kg of slump retaining agent, 3 kg of polysiloxane organic matter, 5 kg of hydroxyethyl cellulose, 30 kg of potassium lignin sulfonate-crotonic acid-maleic anhydride grafted multipolymer, 20 kg of triethanolamine, 30 kg of lithium sulfate, 200 kg of organosilicon-styrene-acrylate ternary copolymer, 30 kg of alcohol-ester-ether-phosphoric acid-amide multipolymer derivative, 15 kg of potassium 2,4-hexadienoate, and 487 kg of water.

[0137] Dry material part: 380kg of 52.5 grade ordinary Portland cement, 130kg of 200 mesh glass powder, 60kg of silica fume, 600kg of (70-140) mesh glass sand, 110kg of 200 mesh silica-ceramic high-strength composite micropowder, 60kg of ground sand, 1150kg of (5-25) mm crushed stone, 10kg of polypropylene fiber, and 150kg of water.

[0138] After preparing the liquid and dry materials, 12 kg of liquid and 2650 kg of dry materials were mixed and stirred evenly, then molded, pumped, and centrifugally formed. The centrifugally formed pipe piles were steamed and autoclaved before finally forming. The C115 pumpable prestressed concrete pipe pile products were thus obtained. Their performance was tested and compared with that of a competing product (a certain brand of high-performance water reducer specially used for early-strength prestressed high-strength concrete pipe piles).

[0139] Comparative Example 7:

[0140] The liquid and dry materials of the pumped prestressed concrete piles were prepared in the following proportions: 130 kg of water reducer, 50 kg of slump retaining agent, 3 kg of polysiloxane organic matter, 5 kg of hydroxyethyl cellulose, 30 kg of potassium lignin sulfonate-crotonic acid-maleic anhydride grafted multipolymer, 20 kg of triethanolamine, 30 kg of lithium sulfate, 50 kg of organosilicon-styrene-acrylate ternary copolymer, 30 kg of alcohol-ester-ether-phosphoric acid-amide multipolymer derivative, 15 kg of potassium 2,4-hexadienoate, and 637 kg of water;

[0141] Dry material part: 400kg of 52.5 grade ordinary Portland cement, 75kg of 200 mesh glass powder, 95kg of silica fume, 600kg of (70-140) mesh glass sand, 110kg of 200 mesh silica-ceramic high-strength composite micropowder, 60kg of ground sand, 1150kg of (5-25) mm crushed stone, 10kg of polypropylene fiber, and 150kg of water.

[0142] After preparing the liquid and dry materials, 12 kg of liquid and 2650 kg of dry materials were mixed and stirred evenly, then molded, pumped, and centrifugally formed. The centrifugally formed pipe piles were steamed and autoclaved before finally forming. The C115 pumpable prestressed concrete pipe pile products were thus obtained. Their performance was tested and compared with that of a competing product (a certain brand of high-performance water reducer specially used for early-strength prestressed high-strength concrete pipe piles).

[0143] Comparative Example 8:

[0144] The liquid and dry materials of the pumped prestressed concrete piles were prepared in the following proportions: 130 kg of water reducer, 50 kg of slump retaining agent, 3 kg of polysiloxane organic matter, 5 kg of hydroxyethyl cellulose, 30 kg of potassium lignin sulfonate-crotonic acid-maleic anhydride grafted multipolymer, 20 kg of triethanolamine, 30 kg of lithium sulfate, 350 kg of organosilicon-styrene-acrylate ternary copolymer, 30 kg of alcohol-ester-ether-phosphoric acid-amide multipolymer derivative, 15 kg of potassium 2,4-hexadienoate, and 337 kg of water;

[0145] Dry material part: 400kg of 52.5 grade ordinary Portland cement, 75kg of 200 mesh glass powder, 95kg of silica fume, 600kg of (70-140) mesh glass sand, 110kg of 200 mesh silica-ceramic high-strength composite micropowder, 60kg of ground sand, 1150kg of (5-25) mm crushed stone, 10kg of polypropylene fiber, and 150kg of water.

[0146] After preparing the liquid and dry materials, 12 kg of liquid and 2650 kg of dry materials were mixed and stirred evenly, then molded, pumped, and centrifugally formed. The centrifugally formed pipe piles were steamed and autoclaved before finally forming. The C115 pumpable prestressed concrete pipe pile products were thus obtained. Their performance was tested and compared with that of a competing product (a certain brand of high-performance water reducer specially used for early-strength prestressed high-strength concrete pipe piles).

[0147] Comparative Example 9:

[0148] The liquid and dry materials of the pumped prestressed concrete piles were prepared in the following proportions: 130 kg of water reducer, 50 kg of slump retaining agent, 3 kg of polysiloxane organic matter, 5 kg of hydroxyethyl cellulose, 5 kg of potassium lignin sulfonate-crotonic acid-maleic anhydride grafted multipolymer, 20 kg of triethanolamine, 30 kg of lithium sulfate, 200 kg of organosilicon-styrene-acrylate ternary copolymer, 30 kg of alcohol-ester-ether-phosphoric acid-amide multipolymer derivative, 15 kg of potassium 2,4-hexadienoate, and 512 kg of water;

[0149] Dry material part: 400kg of 52.5 grade ordinary Portland cement, 75kg of 200 mesh glass powder, 95kg of silica fume, 600kg of (70-140) mesh glass sand, 110kg of 200 mesh silica-ceramic high-strength composite micropowder, 60kg of ground sand, 1150kg of (5-25) mm crushed stone, 10kg of polypropylene fiber, and 150kg of water.

[0150] After preparing the liquid and dry materials, 12 kg of liquid and 2650 kg of dry materials were mixed and stirred evenly, then molded, pumped, and centrifugally formed. The centrifugally formed pipe piles were steamed and autoclaved before finally forming. The C115 pumpable prestressed concrete pipe pile products were thus obtained. Their performance was tested and compared with that of a competing product (a certain brand of high-performance water reducer specially used for early-strength prestressed high-strength concrete pipe piles).

[0151] Comparative Example 10:

[0152] The liquid and dry materials of the pumped prestressed concrete piles were prepared in the following proportions: 130 kg of water reducer, 50 kg of slump retaining agent, 3 kg of polysiloxane organic matter, 5 kg of hydroxyethyl cellulose, 150 kg of potassium lignin sulfonate-crotonic acid-maleic anhydride grafted multipolymer, 20 kg of triethanolamine, 30 kg of lithium sulfate, 200 kg of organosilicon-styrene-acrylate ternary copolymer, 30 kg of alcohol-ester-ether-phosphoric acid-amide multipolymer derivative, 15 kg of potassium 2,4-hexadienoate, and 367 kg of water.

[0153] Dry material part: 400kg of 52.5 grade ordinary Portland cement, 75kg of 200 mesh glass powder, 95kg of silica fume, 600kg of (70-140) mesh glass sand, 110kg of 200 mesh silica-ceramic high-strength composite micropowder, 60kg of ground sand, 1150kg of (5-25) mm crushed stone, 10kg of polypropylene fiber, and 150kg of water.

[0154] After preparing the liquid and dry materials, 12 kg of liquid and 2650 kg of dry materials were mixed and stirred evenly, then molded, pumped, and centrifugally formed. The centrifugally formed pipe piles were steamed and autoclaved before finally forming. The C115 pumpable prestressed concrete pipe pile products were thus obtained. Their performance was tested and compared with that of a competing product (a certain brand of high-performance water reducer specially used for early-strength prestressed high-strength concrete pipe piles).

[0155] Comparative Example 11:

[0156] The liquid and dry materials of the pumped prestressed concrete piles were prepared in the following proportions: 130 kg of water reducer, 50 kg of slump retaining agent, 3 kg of polysiloxane organic matter, 5 kg of hydroxyethyl cellulose, 30 kg of potassium lignin sulfonate-crotonic acid-maleic anhydride grafted multipolymer, 20 kg of triethanolamine, 30 kg of lithium sulfate, 200 kg of organosilicon-styrene-acrylate ternary copolymer, 2 kg of alcohol-ester-ether-phosphoric acid-amide multipolymer derivative, 15 kg of potassium 2,4-hexadienoate, and 515 kg of water;

[0157] Dry material part: 400kg of 52.5 grade ordinary Portland cement, 75kg of 200 mesh glass powder, 95kg of silica fume, 600kg of (70-140) mesh glass sand, 110kg of 200 mesh silica-ceramic high-strength composite micropowder, 60kg of ground sand, 1150kg of (5-25) mm crushed stone, 10kg of polypropylene fiber, and 150kg of water.

[0158] After preparing the liquid and dry materials, 12 kg of liquid and 2650 kg of dry materials were mixed and stirred evenly, then molded, pumped, and centrifugally formed. The centrifugally formed pipe piles were steamed and autoclaved before finally forming. The C115 pumpable prestressed concrete pipe pile products were thus obtained. Their performance was tested and compared with that of a competing product (a certain brand of high-performance water reducer specially used for early-strength prestressed high-strength concrete pipe piles).

[0159] Comparative Example 12:

[0160] The liquid and dry materials of the pumped prestressed concrete piles were prepared in the following proportions: 130 kg of water reducer, 50 kg of slump retaining agent, 3 kg of polysiloxane organic matter, 5 kg of hydroxyethyl cellulose, 30 kg of potassium lignin sulfonate-crotonic acid-maleic anhydride grafted multipolymer, 20 kg of triethanolamine, 30 kg of lithium sulfate, 200 kg of organosilicon-styrene-acrylate ternary copolymer, 75 kg of alcohol-ester-ether-phosphoric acid-amide multipolymer derivative, 15 kg of potassium 2,4-hexadienoate, and 442 kg of water.

[0161] Dry material part: 400kg of 52.5 grade ordinary Portland cement, 75kg of 200 mesh glass powder, 95kg of silica fume, 600kg of (70-140) mesh glass sand, 110kg of 200 mesh silica-ceramic high-strength composite micropowder, 60kg of ground sand, 1150kg of (5-25) mm crushed stone, 10kg of polypropylene fiber, and 150kg of water.

[0162] After preparing the liquid and dry materials, 12 kg of liquid and 2650 kg of dry materials were mixed and stirred evenly, then molded, pumped, and centrifugally formed. The centrifugally formed pipe piles were steamed and autoclaved before finally forming. The C115 pumpable prestressed concrete pipe pile products were thus obtained. Their performance was tested and compared with that of a competing product (a certain brand of high-performance water reducer specially used for early-strength prestressed high-strength concrete pipe piles).

[0163] Comparative Example 13:

[0164] The liquid and dry materials for pumping prestressed concrete piles were prepared in the following proportions: 130 kg of water reducer, 50 kg of slump retaining agent, 3 kg of polysiloxane organic matter, 5 kg of hydroxyethyl cellulose, 20 kg of triethanolamine, 30 kg of lithium sulfate, 200 kg of organosilicon-styrene-acrylate ternary copolymer latex, 30 kg of alcohol-ester-ether-phosphoric acid-amide multi-polymer derivative, 15 kg of potassium 2,4-hexadienoate, and 517 kg of water.

[0165] Dry material part: 400kg of 52.5 grade ordinary Portland cement, 75kg of 200 mesh glass powder, 95kg of silica fume, 550kg of (70-140) mesh glass sand, 120kg of 200 mesh silica-ceramic high-strength composite micropowder, 90kg of ground sand, 1150kg of (5-25) mm crushed stone, 10kg of polypropylene fiber, and 150kg of water.

[0166] After preparing the liquid and dry materials, 12 kg of liquid and 2650 kg of dry materials were mixed and stirred evenly, then molded, pumped, and centrifugally formed. The centrifugally formed pipe piles were steamed and autoclaved before finally forming. The C115 pumpable prestressed concrete pipe pile products were thus obtained. Their performance was tested and compared with that of a competing product (a certain brand of high-performance water reducer specially used for early-strength prestressed high-strength concrete pipe piles).

[0167] Comparative Example 14:

[0168] The liquid and dry materials of the pumped prestressed concrete piles were prepared in the following proportions: 130 kg of water reducer, 50 kg of slump retaining agent, 3 kg of polysiloxane organic matter, 5 kg of hydroxyethyl cellulose, 30 kg of potassium lignin sulfonate-crotonic acid-maleic anhydride grafted multipolymer, 20 kg of triethanolamine, 30 kg of lithium sulfate, 30 kg of alcohol-ester-ether-phosphoric acid-amide multipolymer derivative, 15 kg of potassium 2,4-hexadienoate, and 687 kg of water;

[0169] Dry material part: 400kg of 52.5 grade ordinary Portland cement, 75kg of 200 mesh glass powder, 95kg of silica fume, 550kg of (70-140) mesh glass sand, 120kg of 200 mesh silica-ceramic high-strength composite micropowder, 90kg of ground sand, 1150kg of (5-25) mm crushed stone, 10kg of polypropylene fiber, and 150kg of water.

[0170] After preparing the liquid and dry materials, 12 kg of liquid and 2650 kg of dry materials were mixed and stirred evenly, then molded, pumped, and centrifugally formed. The centrifugally formed pipe piles were steamed and autoclaved before finally forming. The C115 pumpable prestressed concrete pipe pile products were thus obtained. Their performance was tested and compared with that of a competing product (a certain brand of high-performance water reducer specially used for early-strength prestressed high-strength concrete pipe piles).

[0171] Comparative Example 15:

[0172] The liquid and dry materials for pumping prestressed concrete piles were prepared in the following proportions: 130 kg of water reducer, 50 kg of slump retaining agent, 3 kg of polysiloxane organic matter, 5 kg of hydroxyethyl cellulose, 30 kg of potassium lignin sulfonate-crotonic acid-maleic anhydride grafted multipolymer, 20 kg of triethanolamine, 30 kg of lithium sulfate, 200 kg of organosilicon-styrene-acrylate ternary copolymer, 15 kg of potassium 2,4-hexadienoate, and 507 kg of water.

[0173] Dry material part: 400kg of 52.5 grade ordinary Portland cement, 75kg of 200 mesh glass powder, 95kg of silica fume, 550kg of (70-140) mesh glass sand, 120kg of 200 mesh silica-ceramic high-strength composite micropowder, 90kg of ground sand, 1150kg of (5-25) mm crushed stone, 10kg of polypropylene fiber, and 150kg of water.

[0174] After preparing the liquid and dry materials, 12 kg of liquid and 2650 kg of dry materials were mixed and stirred evenly, then molded, pumped, and centrifugally formed. The centrifugally formed pipe piles were steamed and autoclaved before finally forming. The C115 pumpable prestressed concrete pipe pile products were thus obtained. Their performance was tested and compared with that of a competing product (a certain brand of high-performance water reducer specially used for early-strength prestressed high-strength concrete pipe piles).

[0175] Comparative Example 16:

[0176] The liquid and dry materials of the pumped prestressed concrete piles were prepared in the following proportions: 130 kg of water reducer, 50 kg of slump retaining agent, 3 kg of polysiloxane organic matter, 5 kg of hydroxyethyl cellulose, 30 kg of potassium lignin sulfonate-crotonic acid-maleic anhydride grafted multipolymer, 20 kg of triethanolamine, 30 kg of lithium sulfate, 200 kg of organosilicon-styrene-acrylate ternary copolymer, 30 kg of alcohol-ester-ether-phosphoric acid-amide multipolymer derivative, 15 kg of potassium 2,4-hexadienoate, and 487 kg of water.

[0177] Dry material part: 475kg of 52.5 grade ordinary Portland cement, 95kg of silica fume, 550kg of (70-140) mesh glass sand, 120kg of 200 mesh silica-ceramic high-strength composite micropowder, 90kg of ground sand, 1150kg of (5-25) mm crushed stone, 10kg of polypropylene fiber, and 150kg of water.

[0178] After preparing the liquid and dry materials, 12 kg of liquid and 2650 kg of dry materials were mixed and stirred evenly, then molded, pumped, and centrifugally formed. The centrifugally formed pipe piles were steamed and autoclaved before finally forming. The C115 pumpable prestressed concrete pipe pile products were thus obtained. Their performance was tested and compared with that of a competing product (a certain brand of high-performance water reducer specially used for early-strength prestressed high-strength concrete pipe piles).

[0179] Comparative Example 17:

[0180] The liquid and dry materials of the pumped prestressed concrete piles were prepared in the following proportions: 130 kg of water reducer, 50 kg of slump retaining agent, 3 kg of polysiloxane organic matter, 5 kg of hydroxyethyl cellulose, 30 kg of potassium lignin sulfonate-crotonic acid-maleic anhydride grafted multipolymer, 20 kg of triethanolamine, 30 kg of lithium sulfate, 200 kg of organosilicon-styrene-acrylate ternary copolymer, 30 kg of alcohol-ester-ether-phosphoric acid-amide multipolymer derivative, 15 kg of potassium 2,4-hexadienoate, and 487 kg of water.

[0181] Dry material part: 400kg of 52.5 grade ordinary Portland cement, 625kg of 200 mesh glass powder, 95kg of silica fume, 120kg of 200 mesh silica-ceramic high-strength composite micropowder, 90kg of ground sand, 1150kg of (5-25) mm crushed stone, 10kg of polypropylene fiber, and 150kg of water.

[0182] After preparing the liquid and dry materials, 12 kg of liquid and 2650 kg of dry materials were mixed and stirred evenly, then molded, pumped, and centrifugally formed. The centrifugally formed pipe piles were steamed and autoclaved before finally forming. The C115 pumpable prestressed concrete pipe pile products were thus obtained. Their performance was tested and compared with that of a competing product (a certain brand of high-performance water reducer specially used for early-strength prestressed high-strength concrete pipe piles).

[0183] Comparative Example 18:

[0184] The liquid and dry materials of the pumped prestressed concrete piles were prepared in the following proportions: 130 kg of water reducer, 50 kg of slump retaining agent, 3 kg of polysiloxane organic matter, 5 kg of hydroxyethyl cellulose, 30 kg of potassium lignin sulfonate-crotonic acid-maleic anhydride grafted multipolymer, 20 kg of triethanolamine, 30 kg of lithium sulfate, 200 kg of organosilicon-styrene-acrylate ternary copolymer, 30 kg of alcohol-ester-ether-phosphoric acid-amide multipolymer derivative, 15 kg of potassium 2,4-hexadienoate, and 487 kg of water.

[0185] Dry material part: 400kg of 52.5 grade ordinary Portland cement, 75kg of 200 mesh glass powder, 95kg of silica fume, 670kg of (70-140) mesh glass sand, 90kg of ground sand, 1150kg of (5-25) mm crushed stone, 10kg of polypropylene fiber, and 150kg of water.

[0186] After preparing the liquid and dry materials, 12 kg of liquid and 2650 kg of dry materials were mixed and stirred evenly, then molded, pumped, and centrifugally formed. The centrifugally formed pipe piles were steamed and autoclaved before finally forming. The C115 pumpable prestressed concrete pipe pile products were thus obtained. Their performance was tested and compared with that of a competing product (a certain brand of high-performance water reducer specially used for early-strength prestressed high-strength concrete pipe piles).

[0187] The selection of each raw material component in the above-described embodiment and comparative example is as follows:

[0188] 1) The water reducer is the Point-MS4404 polycarboxylate water reducer produced by Fujian Kezhijie New Materials Group Co., Ltd.;

[0189] 2) The collapse preventing agent is the Point-TS4404 polycarboxylic acid collapse preventing agent produced by Kezhijie New Materials Group Fujian Co., Ltd.;

[0190] 3) The defoaming agent is a polysiloxane organic compound, specifically the D508 defoaming agent commercially available from Guangzhou Jiantubao Building Materials Co., Ltd.;

[0191] 4) The preparation process of the modifier is as follows: potassium lignin sulfonate, crotonic acid and maleic anhydride are reacted in Fe (Ⅱ) and H2O2, pH value is 4, reaction temperature is 70 ℃, reaction time is 3h, graft copolymerization reaction is carried out, after the reaction is completed, unreacted raw materials are removed to obtain potassium lignin sulfonate-butenoic acid-maleic anhydride grafted multipolymer; wherein the potassium lignin sulfonate, butenoic acid, maleic anhydride, Fe (Ⅱ) The mass ratio of H2O2 is 100:30:20:5:5.

[0192] 5) The preparation process of the organosilicon-styrene-acrylate ternary copolymer is as follows:

[0193] Step 1: Add the first part of the composite emulsifier into a certain amount of deionized water and stir to dissolve.

[0194] Step 2: Then, butyl acrylate, styrene, and acrylic acid monomer were added and vigorously stirred for 45 minutes to prepare a pre-emulsion;

[0195] The raw material components of the composite emulsifier are composed of nonylphenol polyoxyethylene ether and sodium lauryl sulfate, and the mass ratio of the nonylphenol polyoxyethylene ether to sodium lauryl sulfate is 4:1; the mass fraction of the composite emulsifier in the total amount of the pre-emulsion is 4%, the mass fraction of vinyltriethoxysilane in the total amount of the pre-emulsion is 5%, the mass fraction of butyl acrylate, styrene, and acrylic acid monomer in the total amount of the pre-emulsion is 25%, 30%, and 5%, respectively, and the mass fraction of water in the total amount of the pre-emulsion is 31%.

[0196] In step 3, potassium persulfate as an initiator is dissolved in an appropriate amount of water to prepare an initiator solution, wherein the ratio of potassium persulfate to water is 1:3, and the mass ratio of the initiator solution to the total amount of the pre-emulsion is 1:50.

[0197] Step 4: In a 250 mL four-necked flask equipped with a reflux condenser, an electric stirrer, a constant pressure dropping funnel, and a thermometer, add an appropriate amount of sodium bicarbonate, deionized water, and the second part of the composite emulsifier, stir and dissolve, raise the temperature to 60° C., add the first part of the initiator solution, add the first part of the pre-emulsion dropwise within 35 minutes, and keep the temperature at 80° C. to react until the liquid turns blue;

[0198] The mass ratio of sodium bicarbonate to the total amount of the pre-emulsion is 1:500; the mass ratio of deionized water to the total amount of the pre-emulsion is 1:2.

[0199] Step 5: Mix vinyltriethoxysilane into the second part of the pre-emulsion, drip the pre-emulsion and the second part of the initiator solution into the flask within 3 hours, keep warm and react for 2 hours, cool from 80°C to below 35°C, adjust the pH value to 7.5 with ammonia water, filter and store to obtain the product.

[0200] Among them, the sum of the amounts of the first part of the composite emulsifier and the second part of the composite emulsifier is the total amount of the composite emulsifier; the mass ratio of the first part of the composite emulsifier to the second part of the composite emulsifier is 3:1; the sum of the amounts of the first part of the initiator solution and the second part of the initiator solution is the total amount of the initiator solution; the sum of the amounts of the first part of the pre-emulsion and the second part of the pre-emulsion is the total amount of the pre-emulsion; the mass ratio of the first part of the pre-emulsion to the second part of the pre-emulsion is 1:4.

[0201] 6) The preparation process of the alcohol-ester-ether-phosphoric acid-amide multinary copolymer derivative is:

[0202] Step 1: Add a polyol compound and N-(1,1-dimethyl-3-oxobutyl)acrylamide to a four-necked flask, control the temperature at 35°C, stir, add 1,3-dihydro-1,3-dioxo-5-isobenzofuranoic acid, then add a catalyst, and stir and react at 50°C for 3.5 hours. In this step, the amount of catalyst used accounts for 0.5% of the mass of the polyol compound, N-(1,1-dimethyl-3-oxobutyl)acrylamide and 1,3-dihydro-1,3-dioxo-5-isobenzofuranoic acid:

[0203] Step 2: adding polyphosphate and 15-crown ether-5 to step 1, and then adding a catalyst, controlling the temperature to 55° C., stirring and reacting for 22 hours, wherein the amount of catalyst used in this step is 1.5% by weight of the polyphosphate and 15-crown ether-5;

[0204] Step 3: Add 2,2-dimethoxypropane, butynediol monopropoxy ether and 2-hydroxyethyl acrylate in step 2, then add a catalyst, stir and react at 60° C. for 20 hours, and cool to room temperature to obtain a viscosity reducer. In this step, the amount of catalyst used accounts for 1.0% of the mass of 2,2-dimethoxypropane, butynediol monopropoxy ether and 2-hydroxyethyl acrylate.

[0205] Among them, the polyol compound is a mixture of 2,2-bishydroxymethyl-1,3-propanediol and 2,4,7,9-tetramethyl-5-decyn-4,7-diol, and the molar ratio thereof is 1:1; the catalyst is concentrated sulfuric acid: 1,3-dihydro-1,3-dioxo-5-isobenzofuranoic acid, polyol compound, N-(1,1-dimethyl-3-oxobutyl) acrylamide, 2,2-dimethoxypropane, butynediol monopropoxy ether, 2-hydroxyethyl acrylate, polyphosphate, and 15-crown ether, and the molar ratio thereof is 1:2.5:2:3:1.8:1.5:2.3:1.5.

[0206] 7) The preparation process of the silica-ceramic high-strength composite micropowder is as follows: weigh each raw material component according to a certain weight portion, mix and grind until the fineness of the mixed powder is 200 mesh, and obtain. Wherein, the raw material components of the silica-ceramic high-strength composite micropowder are composed of 25 parts of fused mullite, 20 parts of plate-shaped corundum, 12 parts of pure calcium aluminate cement, 90 parts of ceramic micropowder, 20 parts of methyl propylene silicone rubber, 3 parts of triallyl isocyanurate, 85 parts of fumed silica, 10 parts of butene-1-decene copolymer, 5 parts of calcium polyacrylate, 2 parts of hydroxybutyl distarch phosphate, and 16 parts of silica fume.

[0207] The products prepared in the above embodiments and comparative examples were subjected to performance tests, wherein the index control values ​​of the test items and the test results of competing products are shown in Table 5, and the test results of the embodiments, competing products and comparative examples are shown in Tables 6-9 below:

[0208] Table 5

[0209]

[0210]

[0211] The indicators in the table are derived from the provisions of relevant standards such as JGJ / T 406 "Technical Standard for Prestressed Concrete Piles", GB 50081 "Test Methods for Physical and Mechanical Properties of Concrete" and GB 13476 "Prestressed Concrete Piles by Pretensioning Method" and engineering practice experience.

[0212] Table 6

[0213]

[0214] Table 7

[0215]

[0216]

[0217] Table 8

[0218]

[0219]

[0220] Table 9

[0221]

[0222]

[0223] From the test results in the table above we can see that:

[0224] (1) From the test results of the embodiment of the present invention, it can be seen that:

[0225] Comparing the product qualified control value, the competitive product, and the data of Examples 1-4, it can be seen that:

[0226] Compared with the qualified control value and the data of the above embodiment, the emptying time of the inverted slump cone of the competitor's product is relatively long, the pumping efficiency is relatively low, the anti-seepage pressure is relatively low, cracks appear on the surface, and the workability is poor; the indicators of the above embodiment all meet the control value requirements, indicating that: the embodiment of the present invention improves the problems of poor workability, large water exudation, high viscosity, low compressive strength, and long setting time caused by the application of polycarboxylic acid additives and recycled glass materials in the production of pumped prestressed concrete pipe piles, and makes up for the defects of reduced compressive strength and long setting time of concrete caused by the use of recycled glass materials instead of mineral powder, so that the prepared pumped prestressed concrete pipe piles meet the requirements of relevant standards.

[0227] (2) Compared with the embodiment, the amount of glass sand used in Comparative Example 1 and Comparative Example 2 exceeds the specified range (too small or too large);

[0228] Therefore, compared with the examples and the qualified control values ​​of the product, the emptying time of the falling drum of Comparative Example 1 was too long, the pumping efficiency was too low, the pumping pressure was too high, and cracks appeared on the surface. It can be seen that compared with the examples and the qualified control values ​​of the product, the working performance of Comparative Example 1 was deteriorated. Compared with the examples and the qualified control values ​​of the product, the atmospheric pressure steam curing demoulding strength and high pressure steam curing strength of Comparative Example 2 were too low, the anti-seepage pressure was too low, the setting time was too long, the anti-crack bending moment was too small, and the workability was deteriorated. It can be seen that compared with the examples and the qualified control values ​​of the product, the working performance of Comparative Example 2 was deteriorated.

[0229] (3) Compared with the embodiment, the amount of silica-ceramic high-strength composite micropowder in Comparative Examples 3 and 4 exceeds the specified range (too small and too large); therefore, compared with the embodiment and the product qualified control value, the working performance of Comparative Examples 3 and 4 deteriorates.

[0230] (4) Compared with the embodiment, the amount of glass powder used in comparative examples 5 and 6 exceeds the specified range (too small and too large); therefore, compared with the embodiment and the qualified control value of the product, the working performance of comparative examples 5 and 6 deteriorates.

[0231] (5) Compared with the examples, the emulsion dosage of comparative examples 7 and 8 exceeded the specified range (too small and too large); therefore, compared with the examples and the qualified control values ​​of the products, the working performance of comparative examples 7 and 8 deteriorated.

[0232] (6) Compared with the examples, the amount of modifier used in Comparative Examples 9 and 10 exceeded the specified range (too small and too large); therefore, compared with the examples and the qualified control values ​​of the products, the working performance of Comparative Examples 9 and 10 deteriorated.

[0233] (7) Compared with the examples, the amount of viscosity reducer used in Comparative Examples 11 and 12 exceeded the specified range (too small and too large); therefore, compared with the examples and the qualified control values ​​of the products, the working performance of Comparative Examples 9 and 10 deteriorated.

[0234] (8) Compared with the embodiments, comparative examples 13, 14, 15, 16, 17 and 18 did not add modifiers, emulsions, viscosity reducers, glass powder, glass sand and silica-ceramic high-strength composite micropowder; therefore, compared with the embodiments and the qualified control values ​​of the products, the working performance of comparative examples 13, 14, 15, 16, 17 and 18 deteriorated.

[0235] In summary, the pumped prestressed concrete pipe pile and its preparation method provided by the present invention include at least the following design concepts, working mechanisms and beneficial effects:

[0236] 1. Technical Effect

[0237] The present invention utilizes the properties of recycled glass materials, adopts a specific polymer emulsion and a modifier to modify prestressed concrete pipe piles, and then uses a reinforcing agent in a setting regulator and a silica-ceramic high-strength composite micropowder to improve the problems of poor workability, large water bleeding, high viscosity, low compressive strength, and long setting time caused by the application of polycarboxylic acid additives and recycled glass materials in the production of pumped prestressed concrete pipe piles. The present invention also compensates for the defects of reduced compressive strength and long setting time of concrete caused by the use of recycled glass materials instead of mineral powder. The prepared pumped prestressed concrete pipe piles comply with the provisions of relevant standards such as JGJ / T406 "Technical Standard for Prestressed Concrete Pipe Piles", GB 50081 "Test Methods for Physical and Mechanical Properties of Concrete" and GB 13476 "Prestressed Concrete Pipe Piles by Pretensioning Method" and are relatively affordable.

[0238] The solution of the present invention can enrich the raw material sources of prestressed concrete pipe piles and improve the utilization rate of solid waste building materials while ensuring the working performance of the prestressed concrete pipe piles.

[0239] 2. Design concept and innovation

[0240] (1) Glass powder and glass sand are used to replace the mineral powder and machine-made sand in pipe pile concrete to reduce the viscosity of concrete, while also having the benefits of solid waste resource recycling, economy and environmental protection. This is different from the existing solution in which glass powder (sand) is used simply as concrete or concrete powder and aggregate;

[0241] (2) Using a specific polymer emulsion in combination with a specific modifier to modify the pipe pile concrete. The modifier was originally used in the food industry. When used in combination with a polymer emulsion in concrete, it can reduce water seepage, improve workability, pumpability, impermeability, and reduce viscosity. Currently, no other existing technology has been found to adopt this solution;

[0242] (3) The use of a special viscosity reducer, when applied to pipe pile concrete, can improve the gradation of concrete raw materials, reduce concrete viscosity, and increase the dispersion speed, fullness and construction performance of concrete during production;

[0243] (4) The reinforcing agent in the setting agent is combined with silica-ceramic high-strength composite micropowder to overcome the defect of insufficient compressive strength caused by the use of glass powder (sand) through the alkali excitation effect.

[0244] 3. Mechanism of action:

[0245] Among them, the mechanism of action of each component is:

[0246] Specific polymer emulsions modify concrete, forming a strong polymer film that improves its workability, softness, paste fullness, fluidity, tensile strength, and flexural strength. They also reduce the elastic modulus and internal stress in the concrete system. Furthermore, they enhance the plasticity and impermeability of cement, helping to slow shrinkage and cracking, and improve cement-to-concrete adhesion and tensile strength, thereby increasing the durability and lifespan of the project.

[0247] Applying specific modifiers to prestressed concrete pipe piles can adjust the electronic potential energy distribution between cement particles and reduce the surface activity of flocculant molecules. At the same time, due to its high activity, it can replace water reducers and slump retaining agents and be preferentially adsorbed by flocculant molecules, effectively improving the plasticizing effect of liquid materials, reducing concrete water exudation and viscosity, and improving the workability and performance of prestressed concrete pipe piles.

[0248] The specific viscosity reducer used has both hydrophobic and hydrophilic groups and is highly dispersible. The electrostatic force acting on cement particles is three-dimensional, which can introduce a large number of tiny, continuous, stable, closed spherical beneficial bubbles into the concrete system while ensuring the strength of the concrete. Since the water is evenly distributed on the surface of a large number of bubbles, the amount of water that can move freely is reduced, thereby reducing the water exudation and viscosity of the concrete and improving the workability of the concrete.

[0249] Water reducers and slump inhibitors are both polycarboxylic acid grafted multi-component copolymers. Their primary function is to adsorb onto the surface of cement particles. Due to their like charges, the particles repel each other, dispersing the cement particles and releasing excess water between them, resulting in a water-reducing effect. When added, these agents form an adsorption film on the surface of cement particles, slowing the hydration process and promoting the growth of cement stone crystals. This reduces capillary voids caused by water evaporation, thereby improving the strength, hardness, and structural density of concrete.

[0250] The main function of adding defoaming agent is to destroy the elastic membrane of harmful bubbles in concrete and inhibit the generation of harmful bubbles; if harmful bubbles have already been generated, the defoaming agent particles will immediately capture the hydrophobic chain ends on the foam surface after contacting the foam, and then quickly spread to form a very thin double membrane layer, further diffuse and invade in layers, replacing the membrane wall of the original foam, and destroying the mechanical balance of the directional membrane under the strong traction of the surrounding membrane layer with high surface tension, thereby achieving the effect of breaking and suppressing bubbles, thereby improving the strength of the concrete.

[0251] The main function of adding stabilizers is to form hydrogen bonds between the hydroxyl groups on the modifier molecules and the oxygen atoms on the ether bonds and water molecules. The mutual diffusion between the water molecules and the modifier molecular chains allows the water molecules to enter the interior of the modifier macromolecular chains and be subject to strong constraints, turning free water into bound water, thereby improving the water retention of concrete. On the other hand, the modifier improves the rheological properties of the freshly mixed cement paste. The porous network structure, osmotic pressure and film-forming properties of the modifier also hinder the diffusion of water, thereby improving the stability of concrete to heat, salt and acid and alkali.

[0252] The added setting regulator is used to adjust the setting time of prestressed concrete piles, prevent the concrete from setting quickly or too slowly, and improve the strength of the concrete through alkali stimulation.

[0253] The main function of adding preservatives is to inhibit the growth of microorganisms caused by the presence of organic matter during the storage of liquid materials. By coagulating and denaturing the proteins in the microorganisms, their survival and reproduction are interfered with, thereby extending the shelf life of the liquid materials.

[0254] The role of adding fiber is to inhibit the appearance and development of concrete cracks, reduce water outflow and aggregate settlement on the concrete surface, significantly reduce the content of tiny voids in the concrete, and effectively improve the impermeability, density and strength of prestressed concrete pipe piles.

[0255] In summary, the present invention provides a method for preparing pumped prestressed concrete pipe piles using recycled glass materials and silica-ceramic high-strength composite micropowder. Through the synergistic effect of modifiers, viscosity reducers and polymer emulsion modification and the stimulation of other components, the method can solve the problems of high system viscosity, poor workability, and large water exudation caused by the use of polycarboxylic acid additives in pumped prestressed concrete pipe piles, and make up for the defects of reduced concrete compressive strength and long setting time caused by the use of recycled glass materials instead of mineral powder, while retaining its advantages such as high transparency and strong scratch resistance, so that the concrete pipe piles meet application requirements; at the same time, it can enrich the source of raw materials for prestressed concrete pipe piles and improve the utilization rate of solid waste building materials while ensuring the working performance of prestressed concrete pipe piles.

[0256] It should be noted that:

[0257] In this article, “~” is used to indicate a numerical range, and the range indicated by this expression includes two endpoint values.

[0258] The production process of glass powder and glass sand used in this article can refer to the patent "A glass micropowder grinding aid, concrete admixture for PHC pipe piles and preparation method thereof" (patent number: CN114213054B).

[0259] The specific parameters or some commonly used reagents or raw materials in the above embodiments are specific embodiments or preferred embodiments of the present invention, but are not intended to limit the present invention. Those skilled in the art may make adaptive adjustments within the scope of the present invention.

[0260] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pumped prestressed concrete pipe pile, characterized in that: The components include liquid material and dry material; The liquid material comprises the following raw material components: 10-30 parts of water reducing agent, 2-10 parts of slump retaining agent, 0.1-1 part of defoaming agent, 0.1-3 parts of stabilizer, 1-10 parts of modifier, 1-10 parts of setting regulator, 10-30 parts of polymer emulsion, 0.5-5 parts of viscosity reducer, 1-5 parts of preservative, and 10-500 parts of water; The dry material comprises the following raw material components: 30-60 parts of Portland cement, 5-10 parts of glass powder, 2-15 parts of silica fume, 45-65 parts of glass sand, 5-20 parts of silica-ceramic high-strength composite micropowder, 3-20 parts of ground sand, 80-130 parts of crushed stone, 0.5-2 parts of fiber, and 10-20 parts of water; The polymer emulsion is a silicone-modified styrene and acrylate copolymer; the modifier is a potassium lignin sulfonate-butenoic acid-maleic anhydride grafted multipolymer; The raw material components of the silica-ceramic high-strength composite micropowder include: 10-30 parts of fused mullite, 5-25 parts of plate-shaped corundum, 1-15 parts of pure calcium aluminate cement, 30-100 parts of ceramic micropowder, 10-30 parts of methyl propylene p-methylphenyl silicone rubber, 1-7 parts of triallyl isocyanurate, 30-100 parts of fumed silica, 1-15 parts of butene-1-decene copolymer, 1-8 parts of calcium polyacrylate, 1-3 parts of hydroxybutyl distarch phosphate, and 3-20 parts of silica fume; Wherein, the mass ratio of the liquid material to the dry material is (0.3-2):(100-500).

2. The pumped prestressed concrete pile according to claim 1 is characterized in that The preparation process of the silica-ceramic high-strength composite micropowder is as follows: weigh each raw material component according to a certain weight portion, mix and grind until the fineness of the mixed powder is 170-270 mesh.

3. The pumped prestressed concrete pile according to claim 1 is characterized in that The polymer emulsion is prepared by a pre-emulsification method, and its preparation process comprises the following steps: Step 1: Add the first part of the composite emulsifier into a certain amount of deionized water and stir to dissolve; Step 2: Then add butyl acrylate, styrene, and acrylic acid monomer, and stir vigorously for a certain period of time to prepare a pre-emulsion; Step 3: Dissolve the initiator potassium persulfate in an appropriate amount of water to prepare an initiator solution; Step 4: In a flask equipped with a reflux condenser, an electric stirrer, a constant pressure dropping funnel, and a thermometer, add an appropriate amount of sodium bicarbonate, deionized water, and the second part of the composite emulsifier, stir and dissolve, raise the temperature to 50-70°C, add the first part of the initiator solution, add the first part of the pre-emulsion dropwise within 20-40 minutes, and keep the temperature at 75-80°C to react until the liquid turns blue; Step 5: Mix vinyltriethoxysilane into the second part of the pre-emulsion, and drop the second part of the pre-emulsion and the second part of the initiator solution into the flask within 2 to 3 hours. After the addition is completed, keep the temperature for reaction for 1 to 2 hours, cool it from 75 to 80°C to below 20 to 40°C, adjust the pH value to 7 to 8 with ammonia water, filter and store.

4. The pumped prestressed concrete pile according to claim 3 is characterized in that : The sum of the amounts of the first part of the composite emulsifier and the second part of the composite emulsifier is the total amount of the composite emulsifier; the mass ratio of the first part of the composite emulsifier to the second part of the composite emulsifier is (2-6): (0.5-2); The sum of the amounts of the first part of the initiator solution and the second part of the initiator solution is the total amount of the initiator solution; The sum of the amounts of the first part of the pre-emulsion and the second part of the pre-emulsion is the total amount of the pre-emulsion; the mass ratio of the first part of the pre-emulsion to the second part of the pre-emulsion is (0.5-1.5): (2-6); The raw material components of the composite emulsifier include nonylphenol polyoxyethylene ether and sodium lauryl sulfate, and the mass ratio of nonylphenol polyoxyethylene ether to sodium lauryl sulfate is 5:1 to 2:1; The mass fraction of the composite emulsifier in the total amount of the pre-emulsion is 3% to 5%, the mass fraction of vinyl triethoxysilane in the pre-emulsion is 2% to 6%, and the mass fractions of butyl acrylate, styrene, and acrylic acid monomer in the total amount of the pre-emulsion are 10% to 40%, 15% to 40%, and 1% to 10%, respectively.

5. The pumped prestressed concrete pile according to claim 1 is characterized in that : The preparation process of the modifier is: Potassium lignin sulfonate, crotonic acid and maleic anhydride were added to the reactor, and the pH value of the reaction system was adjusted to 2-5. (Ⅱ) Under the action of H2O2, the graft copolymerization reaction is carried out at a reaction temperature of 50-90°C for 2-5 hours. After the reaction is completed, impurities are removed and purified to obtain; Wherein, the potassium lignin sulfonate, butenoic acid, maleic anhydride, Fe (Ⅱ) The mass ratio of H2O2 is 100:(15~40):(5~30):(1~8):(2~10).

6. The pumped prestressed concrete pile according to claim 1 is characterized in that The viscosity reducer is prepared from 1,3-dihydro-1,3-dioxo-5-isobenzofuranoic acid, a polyol compound, N-(1,1-dimethyl-3-oxobutyl) acrylamide, 2,2-dimethoxypropane, butynediol monopropoxy ether, 2-hydroxyethyl acrylate, polyphosphate, and 15-crown ether-5 as raw materials, and is prepared by polymerization reaction under the action of a catalyst: The molar ratio of 1,3-dihydro-1,3-dioxo-5-isobenzofuranoic acid, polyol compound, N-(1,1-dimethyl-3-oxobutyl)acrylamide, 2,2-dimethoxypropane, butynediol monopropoxy ether, 2-hydroxyethyl acrylate, polyphosphate, and 15-crown ether-5 is 1:(1-3):(1-5):(1-4):(1-3):(1-5):(1-4):(1-3); The polyol compound is one or more combinations of 2,2-bishydroxymethyl-1,3-propanediol and 2,4,7,9-tetramethyl-5-decyne-4,7-diol; and the catalyst is one or more combinations of hydrogen peroxide, concentrated sulfuric acid and concentrated nitric acid.

7. The pumped prestressed concrete pipe pile according to claim 6 is characterized in that : The preparation process of the viscosity reducer is: Add a polyol compound and N-(1,1-dimethyl-3-oxobutyl)acrylamide to the reactor, control the system temperature at 25°C to 45°C, and stir to mix; then add 1,3-dihydro-1,3-dioxo-5-isobenzofuranoic acid, and then add the first part of the catalyst, and react at 30°C to 50°C for 3 to 4 hours; Continue to add polyphosphate, 15-crown ether-5, and the second part of the catalyst, control the system temperature at 45°C to 65°C, and react at this constant temperature for 20 to 24 hours; Continue to add 2,2-dimethoxypropane, butynediol monopropoxy ether and 2-hydroxyethyl acrylate, and the third part of the catalyst, react at 40°C to 70°C for 15 to 25 hours, and cool to room temperature to obtain; The amount of the catalyst is the sum of the amounts of the first part of the catalyst, the second part of the catalyst and the third part of the catalyst; the amount of the first part of the catalyst accounts for 0.1% to 1.0% of the total mass of the polyol compound, N-(1,1-dimethyl-3-oxobutyl) acrylamide and 1,3-dihydro-1,3-dioxo-5-isobenzofuranoic acid; the amount of the second part of the catalyst accounts for 0.2% to 3.0% of the total mass of the polyphosphate and 15-crown ether-5; the amount of the third part of the catalyst accounts for 0.1% to 3.0% of the total mass of 2,2-dimethoxypropane, butynediol monopropoxy ether and 2-hydroxyethyl acrylate.

8. The pumped prestressed concrete pipe pile according to claim 1 is characterized in that : The water reducing agent and slump retaining agent are polycarboxylic acid grafted multi-component copolymers; And / or, the defoaming agent is a polysiloxane organic compound; And / or, the stabilizer is one or more combinations of Brunei gum, diutan gum, nanocellulose, xanthan gum, and hydroxyethyl cellulose; And / or, the setting agent includes a reinforcing agent and a coagulant, wherein the reinforcing agent is one or more combinations of calcium nitrate, sodium sulfate, triethanolamine, and nanocrystalline core reinforcing agent; the coagulant is one or more combinations of calcium fluoroaluminate, sodium thiocyanate, lithium sulfate, and potassium silicate; And / or, the preservative is potassium 2,4-hexadienoate; And / or, the Portland cement is 52.5 grade ordinary Portland cement; And / or, the mesh number of the glass powder is 170 to 270; And / or, the mesh number of the glass sand is 70 to 140; and / or, the crushed stone has a particle size of 5 to 25 mm; And / or, the fiber is polypropylene fiber.

9. A method for preparing a pumped prestressed concrete pipe pile according to any one of claims 1 to 8, characterized in that: The method comprises the following preparation steps: Weighing and mixing the raw material components of the dry material to prepare the dry material; Weighing and mixing the raw material components of the liquid material to prepare the liquid material; The liquid material and the dry material are weighed and mixed, and the mixture is stirred evenly, and then the mold is closed, the material is pumped, and the centrifugal molding is performed; and the centrifugally molded pipe pile is steamed and autoclaved for curing, and finally formed to obtain the product.

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