139results about How to "Good early strength" patented technology

The invention proposes a compounding formula and manufacture method of an early-strength polyocarboxy acid high performance water reducing agent. The compounding formula is as follows: (1) the mass ratio of 37 61.5percent allyl polyethyleneoxide ether water-soluble fluid with polymerization degree 37, allyl polyethyleneoxide ether, acrylic acid, 27.7percent acrylic amide water-soluble fluid, 26.2percent methyl propylene sulfonic acid sodium water-soluble liquid is 2321:882:311:276.7:542.2; (2) the consumed amount of the initiator hydrogen peroxide is 0.2percent of a monomer mole number; (3) the initiator Sodium bisulfoxylate is 0.06percent of a monomer mole number; (4) the five elements copolymerization is carried on in the 60percent density system under 55 DEG C. The invention synthesizes carboxylic acid series product with strong early-strength performance, which especially are used for increasing the early-strength of the concrete largely under the low temperature of the winter to speed up the concrete construction progress and enhance the use efficiency of the construction template though the adjustment of the formula and craft. The invention is suitable for the concrete project with high requirements for the concrete early-strength (within 2 days).

The invention discloses a preparation technology for a slag foamed concrete block. The preparation technology comprises: (1) preparing a slag early strength agent; (2) preparing a slag cementing material; (3) preparing a compound admixture; (4) preparing foam of a foaming agent; (5) preparing a mixed slurry; (6) mixing the mixed slurry and the foam of the foaming agent according to a volume ratio of 1:6, followed by carrying out stirring to prepare a foamed slurry having a volume weight of 20-130 mm; (7) conveying the foamed slurry in a standing room, and supplying saturated vapor to the standing room, wherein a heating rate on the standing room is 5-8 DEG C per hour, followed by standing for 3-6 hours at a temperature of 55-60 DEG C, then conveying the stood foamed slurry in a autoclave, wherein steam pressure in the autoclave is increased to 0.8-1.2 Mpa in 2-3 hours, then remaining a constant temperature for 4-6 hours, followed by decreasing the steam pressure to zero in 2-2.5 hours to prepare the finished product. Each technical index of the solid slag autoclaved foamed concrete block provided by the present invention is superior to or accords with standard requirements of JC/T1062-2007 foamed concrete block.

The invention discloses a preparation method of an ester early-strength polycarboxylic acid water reducing agent. The technical scheme is as follows: the preparation method comprises the following steps: preparing amide small monomer by amidation reaction, preparing esterified big monomer by esterification reaction, and carrying out free radical copolymerization with other unsaturated monomers to obtain the ester early-strength polycarboxylic acid water reducing agent. The product has excellent early-strength property, and can effectively enhance the early strength of the concrete.

The invention discloses a preparation method of a synthetic type polycarboxylic acid water reducer. The synthetic type polycarboxylic acid water reducer has a solid content of 40-50%, and is prepared from the following raw materials in parts by weight: 100 parts of unsaturated polyoxyethylene ether, 7-15 parts of unsaturated acid, 4-10 parts of unsaturated ester, 1-3 parts of an amide derivative, 0.5-2 parts of an oxidant, 0.2-1.2 parts of a chain transfer agent, 0.3-2 parts of a reducing agent, 0.1-1 part of a crosslinking agent, 0.01-0.1 part of ferrous sulfate heptahydrate, 5-10 parts of a commercially available mud-resistant auxiliary agent, 90-130 parts of deionized water and an appropriate amount of liquid caustic soda. The preparation method disclosed by the invention adopts a normal-temperature oxidation-reduction initiating system to synthesize the synthetic type polycarboxylic acid water reducer which not only has functions of water reduction and slump loss resistance, but also has functions of mud resistance and early strength, heating is not needed for reaction, the energy consumption is reduced, and the production cost is greatly reduced.

The invention discloses a rapid-hardened super-early strength polycarboxylate water reducer and a preparation method thereof. According to the rapid-hardened super-early strength polycarboxylate waterreducer disclosed by the invention, by using a molecular cutting technique, molecular structures of main chain groups, side chain groups and the like are designed, a polyether monomer of a super-highmolecular weight is adopted as an active large monomer, a structure with a long side chain and a short main chain is formed by molecular chains, a small monomer of self-made unsaturated alcohol aminoester and small monomers such as ethyl methacrylate with N groups and triallylamine are introduced, and solution polymerization is carried out at a low temperature. The synthesized polycarboxylate water reducer has an outstanding function of promoting cement hydration reactions, can be applied to steam-curing concrete, low-temperature environment concrete and concrete with a requirement of demolding in advance, is capable of remarkably shortening the plastering and primary curing time of a molded plate, has a remarkable early strength effect, and is capable of accelerating the construction progress of concrete and increasing the transfer rate of mold plates.

The invention discloses alkali-activating-agent-doped early strength super-high performance concrete and a preparation method thereof. The concrete comprises, by mass, 1019-1059 parts of a cementing material, 1120-1271 parts of quartz sand, 165-205 parts of fibers, 20.38-21.18 parts of a water reducing agent, 12.2-25.6 parts of a de-foaming agent, 20.38-21.18 parts of an alkali activating agent and 152.85-180.03 parts of water. Under the effect of the alkali activating agent, the cementing material contains lots of Si-O and Al-O bond rupture, SiO4 and AlO4 tetrahedrons are made to be fast dissolved out, lots of inorganic high-molecular polymers are fast formed through a polycondensation reaction, the early strength of the concrete is improved fast, and the super early strength effect is achieved. The alkali activating agent is doped in, the initial setting time of the super-high performance concrete is greatly shortened, the super-high performance concrete is made to have very high early strength, the stripping time is shortened, and the circulation efficiency of preparation of the concrete is accelerated.

The invention discloses a preparation method of cheap single-component alkali-activated cement and an application method thereof. The preparation method comprises the following steps: respectively grinding salic raw material, calcareous raw material, cheap salt containing alkali metal and carbonaceous raw material; then mixing according to a certain sequence and proportion so as to generate a raw material; quickly heating the raw material powder till a preset maximum temperature; after preserving the temperature for 0.5-3.0 hours, quickly cooling till a normal temperature to obtain clinker; grinding the clinker till the fineness of cement so as to obtain cement; adding water into the cement to be mixed into slurry, wherein the water is added till the slurry of water and cement can be compacted through vibration in a mold; after the slurry added in the mold is compacted through vibration, moisturizing and curing for 1-3 days at the temperature of 50-80 DEG C so as to obtain required strength; and doping other aggregates and inert fillers in the cement slurry according to the requirement. The raw materials of the cheap single-component alkali-activated cement are rich, easily obtained and low in cost; and the whole preparation process is low-carbon and low in energy consumption, and the obtained product has good early strength so as to establish a new way for cement material.

The invention discloses a high-efficiency water-reducing agent, which is prepared by the following raw materials in parts by weight: 50-60 parts of beta-naphthalene sulfonate formaldehyde condensate, 20-30 parts of poly(ethylene glycol) monomethyl ether methacrylate, 15-25 parts of calcium lignosulphonate, 10-15 parts of ethylene oxide-propylene oxide copolymer, 2-4 parts of trehalose, 1.5-2.5 parts of silicone powder, 4-8 parts of shale ashes, 2.5-4.5 parts of sodium hydrogen sulfite, 5-10 parts of polyethylene oxide, 8-14 parts of aluminum tripolyphosphate, 2-3 parts of cocoanut oil diethanolamide, 1-2 parts of barium dinonyl naphthalenesulfonate, 2-3 parts of urotropine, and 3-5 parts of auxiliaries. The water-reducing agent is high in water-reducing rate, good in flowability, capable of obviously improving the flowability and working degree of the concrete, obvious in early-strength effect after being finally set, capable of greatly improving the strength of the concrete in all ages, and applicable to various concretes.

The invention discloses a reduced shrinkage early strength polycarboxylic acid water reducing agent mother liquid and a preparation process thereof. The water reducing agent mother liquid is preparedby the free radical copolymerization reaction of a polyether macro-monomer, an anionic active monomer, a cationic active monomer, a shrinkage reducing monomer, a chain transfer agent and an initiator;wherein the polyether macro-monomer is isopentenyl polyoxyethylene ether and/or methyl allyl polyoxyethylene ether; the anionic active monomer is acrylic acid; the cationic active monomer is methacrylatoethyl trimethyl ammonium chloride; the shrinkage reducing monomer is an esterification reaction product of a phenyl alcohol or a methyl phenyl alcohol with acrylic acid; the chain transfer agent is 2-methyl-2-propene-1-sulfonic acid sodium salt; and the initiator comprises an initiator system A and an initiator system B, the initiator system A comprises organic hydrogen peroxide and vitamin C,and the initiator system B comprises sodium bisulfite and a ferrous salt. According to the preparation process, different functional monomers are grafted to the high-performance polycarboxylic acid water reducing agent, and the length of the main chain is adjusted, so that the polycarboxylic acid water reducing agent has excellent water reducing rate, and also has early strength and reduced shrinkage.

The invention discloses a preparation method of a high-thixotropy early-strength type polycarboxylate superplasticizer. The preparation method comprises the following steps of (1) adding isobutene polyoxyethylene ether and/or isopentene polyoxyethylene ether, micromolecular polyether, unsaturated fatty acid glyceride, a quaternary ammonium salt monomer and an oxidant into water, and stirring the mixture under 15 to 30 DEG C until the mixture is dissolved; (2) preparing a first solution by a reducing agent and water, preparing a second solution by a chain transfer agent and the water, and preparing a third solution by unsaturated monocarboxylic acid, an unsaturated carboxylic ester monomer and the water; (3) dropping the first solution, the second solution and the third solution in materials in step (1) within 3 to 4 hours at the same time, and carrying out a heat-preservation reaction for 1 to 1.5 hours under 35 to 40 DEG C after dropping is completed; (4) adding an alkaline modifier to neutralize the pH (Potential Of Hydrogen) to be 6 to 7 after the reaction of the materials in step (3) is completed, thus obtaining the high-thixotropy early-strength type polycarboxylate superplasticizer. The high-thixotropy early-strength type polycarboxylate superplasticizer prepared by the invention has an excellent thixotropic property.

The present invention discloses a green expansive cementing material based on salt chemical industry solid waste and building garbage, and a preparation method thereof, wherein salt-containing chemical industry waste (salt mud, carbide slag and mirabilite), building garbage (gravel, broken bricks and concrete blocks), steelmaking plant waste residue (water residue and steel residue) and power plant desulfuration gypsum are matched with an expander, a water reducer, a soluble calcium salt and other components, and fine grinding and uniform mixing are performed to prepare the green expansive cementing material. According to the present invention, the salt mud, the carbide slag, the mirabilite and other solid waste produced by the salt chemical industry enterprise are digested while the building garbage, the desulfuration gypsum, the water residue and other solid water are subjected to the resource utilization, such that the green expansive cementing material is the green environmental protection cementing material; and the green expansive cementing material has characteristics of good expansion property, good fluidity, good consolidation property, good early strength, active tightening and effective earth's surface sinking control, is the cementing material for mine, and is particularly suitable for the filling mining of coal mines or non-coal mines.

The invention provides an additive for improving early strength of a cement based material. The additive is prepared by the reaction of an ionic copolymer and silane, wherein the ionic copolymer is prepared by the reaction of a monomer A, a monomer B, a monomer C and a monomer D. The invention further provides a preparation method of the additive for improving early strength of the cement based material and application of the additive in improvement of the early strength of the cement based material. The additive is simple in preparation process, convenient to use, low in cost and relatively high in water reduction rate, accelerates the hydration of the cement in the early stage, improves the early strength of the cement based material, particularly shows an obvious effect on improving the early strength of the cement based material at a low temperature environment, is relatively high in adaptability to the raw materials, has a good super early strength improving effect for different cement, and does not have any adverse effect on the future strength and durability.

The invention relates to the technical field of concrete additives in building materials, specifically to an early strength type polycarboxylate superplasticizer and a preparation method thereof. Theearly strength type polycarboxylate superplasticizer is prepared from the following raw materials through a polymerization reaction: block unsaturated polyoxyethylene ether, acrylic acid, a functionalmonomer, a chain transfer agent, an oxidative initiator and a reductive initiator. According to the invention, the block unsaturated polyoxyethylene ether is adopted as a raw material, and a macromolecular block polyether side chain can improve the water-reducing rate performance of a superplasticizer, also exerts the performances of early strength, viscosity reduction and shrinkage resistance, greatly reduces the content of air, shortens the setting time of concrete and has excellent working performance and adaptability.

The invention provides lime silica sand silicate cement and a use technique method thereof in tubular pile production. The lime silica sand silicate cement is obtained by the following steps: mixing lime silicate cement clinker, silica sand, quicklime, gypsum and the like in a certain proportion; and then grinding. The use technique method is as follows: the cement is used for replacing high-label silicate cement or ordinary silicate cement, and a tubular pile is produced by using a steam maintenance process. By using the cement, the concrete in the tubular pile under the normal-pressure maintenance condition has good early strength property, and the strength of the concrete in the tubular pile under the autoclave maintenance condition.

The invention discloses highly anti-bending and wearing-resistant lightweight concrete, which comprises the following raw material constituents in parts by weight: 200-250 parts of cement, 100-150 parts of coal ash, 150-200 parts of river sand, 100-180 parts of manganese residue, 150-200 parts of ceramsite, 20-50 parts of silicon carbide, 15-35 parts of plant fiber, 200-250 parts of water, 0.3-1.5 parts of dipropyl ethylene glycol monobutyl ether, 3-6 parts of silicon resin polyether emulsion, 0.3-1.8 parts of sodium chloride, 2-5 parts of triethanolamine, 0.3-1 part of sodium sulfate, 1-3 parts of epoxy resin, 1-3.5 parts of waste polyurethane, 1-2.3 parts of sodium stearate, 5-16 parts of nano calcium oxide, 0.3-0.9 part of coagulant, 2-5 parts of melamine water reducer and 5-18 parts of foaming agent. The highly anti-bending and wearing-resistant lightweight concrete provided by the invention has high anti-bending strength, good wear resistance, light weight and excellent water resistance.

The invention discloses a method for preparing a special functional polycarboxylate water reducer for a PHC pipe pile. The water reducer is prepared by carrying out a free radical polymerization reaction among a macromonomer A, a small monomer B, a small monomer C and a small monomer D in a water-based medium under the action of a water-soluble redox system, wherein a molar ratio of the monomers A, B, C and D is 1:(3-9):(1-3):(1-3). The functional polycarboxylate water reducer disclosed by the invention has the advantages that (1) according to the reasonably designed polyether macromonomer, pore parameters and distribution uniformity inside hardened concrete can be obviously improved, and the compressive strength of the concrete is obviously enhanced; (2) early hydration of cement is obviously improved, and the early strength of the concrete is improved; (3) the water reducer has high dispersing capacity and dispersion retaining capacity under low mixing amount, the concrete strength is obviously enhanced, and the early strength effect is outstanding; and (4) fresh mixed concrete is good in working performance, low in apparent viscosity and convenient for construction.

The invention provides a micro-expansion super early-strength bearing grout which comprises the following raw materials in parts by weight: 30-50 parts of cement, 40-60 parts of sand, 0.5-2.5 parts of water-reducing agent, 2-4 parts of expanding agent, 0.1-0.5 part of retarder and 5-10 parts of enhancer. The micro-expansion super early-strength bearing grout has the following advantages: (1) the working property is excellent, the initial fluidity reaches 320mm, and the fluidity at 30min is still above 240mm; (2) the early strength has rapid development, the strength at the late stage is not reduced, the compressive strength at 2h can be more than 20MPa, the compressive strength at 24h is more than 40MPa, the flexural strength is greater than 10MPa, and the compressive strength at 28d is greater than 50MPa; and (3) the micro-expansion super early-strength bearing grout has micro-expansion property. In view of the advantages, the micro-expansion super early-strength bearing grout can effectively improve the construction rate of a foundation bearing and other structures, and ensure the installation conformance and the construction quality of members.

The invention relates to a composite early-strength type polycarboxylate superplasticizer as well as a preparation method and application thereof, belonging to the field of building materials. The technical problem to be solved by the invention is to provide the composite early-strength type polycarboxylate superplasticizer as well as the preparation method and application thereof. The composite early-strength type polycarboxylate superplasticizer is prepared from the following components in parts by weight: 20-50 parts of polycarboxylate superplasticizer, 2-5 parts of retarder, 30-75 parts of sodium thiosulfate, 3-10 parts of tri-isopropanolamine and 50-80 parts of water. Further, the invention also discloses the preparation method of the composite early-strength type polycarboxylate superplasticizer and the application of the composite early-strength type polycarboxylate superplasticizer in C15-C16 concrete. The composite early-strength type polycarboxylate superplasticizer disclosed by the invention has the advantages of excellent early-strength performance, relatively good compatibility among components, low alkali content, low shrinkage rate, low mixing amount and the like.

The invention discloses an early-strength low-hydration heat evolution cement paste system applicable to deepwater shallow cementation. The system is prepared from 100 parts of cement, 5-10 parts of phase-change heat absorption materials, 10-30 parts of a density reducing agent, 8-15 parts of suspension materials, 0.5-1 part of a drag reducer, 0.3-0.55 part of retarder, 0.7-1 part of a fluid loss agent, 0.7-1 part of a defoaming agent, 0.06-0.1 part of an early strength agent and 68.2-82.3 parts of water. The cement paste system has the good early strength property at low temperature, is small in hydration heat evolution amount and good in thickening property, flowing property and sedimentation stability, has right-angle thickening property and small water loss, and meets on-site construction requirements. According to the system, surface cementation in the deepwater hydrate layer can be achieved, operation time and cost can be saved, and a technical support is provided for mining of oil and gas resources in the deepwater hydrate layer.

The invention relates to an early-strength type mining sealing material. The sealing material comprises the following components in parts by weight: 0.1-8% of inorganic salt early-strength components, 0.1-0.8% of organic early-strength components of, 0.1-0.5% of water reducing components, and the balance of cement clinker. The finished product can be obtained by mixing the components according to the proportion and evenly stirring and dispersing. The sealing material has an early-strength effect, the one-day strength is 14.5MPa, three-day strength is 26.7MPa, seven-day strength is 39.1MPa, the fluidity of cement past is greater than 200mm, the coagulation time is shorter than 500min, the pumping performance is not affected while the early-strength performance is improved, the sealing material can completely meet the use demands for mine gas pumping and deep hole blasting sealing, the blasting waiting time can be greatly shortened, thus being safer. Furthermore, the material can be prepared underground on site, and is non-toxic and pollution-free. The material not only can be used for sealing for pumping mine gas or drilling during blasting of deep holes, but also can be used for blocking other related cracks.

The invention provides a water reducing agent and a preparation method thereof, an anti-freezing agent and a purpose thereof, and concrete, which belongs to the technical field of freeze protection. The water reducing agent includes the following raw materials: isoamylenol polyoxyethylene ether and allyl alcohol polyoxyethylene ether, and at least one of acrylic acid and maleic anhydride, whereinthe molar ratio of the isoamylenol polyoxyethylene ether to the allyl alcohol polyoxyethylene ether is 1: (0.5-1). The anti-freezing agent includes the water reducing agent and non-oxidizing salts. The water reducing agent utilizes the isoamylenol polyoxyethylene ether and the allyl alcohol polyoxyethylene ether to perform cooperation as a water reducing agent synthesis monomer, under the synergistic effect of the two, the early strength performance of a product can be improved and the workability of the product can be improved, when the water reducing agent is applied to the anti-freezing agent, and since the water reducing agent is strong in early strength performance, usage of antifreezing early strength components in the anti-freezing agent can be effectively reduced.; and the anti-freezing agent is high in safety, is beneficial to reduce an alkali content in the concrete, and can effectively reduce the risk of bleeding of the concrete.