C100 non-autoclaved machine-made sand concrete pipe pile and preparation method thereof

Abstract

The invention relates to the field of concrete, and particularly discloses a C100 non-autoclaved machine-made sand concrete pipe pile and a preparation method thereof.The C100 non-autoclaved machine-made sand concrete pipe pile is prepared from cement, gravel, machine-made sand, mineral powder, fly ash, a water reducing agent, water, an interface agent, filling fibers, filler and an air entraining agent; the filling fiber is prepared from a fiber material, ethylhydroxycellulose and a cetostearyl alcohol solution in a mass ratio of 1: (0.1-0.15): (0.1-0.2); the preparation method comprises the following steps: uniformly mixing the cement, the gravel, the machine-made sand, the mineral powder and the fly ash, adding the interface agent, the filling fiber and the filler, continuously uniformly mixing, adding the water, the water reducing agent and the air entraining agent, and uniformly mixing to obtain a mixture; after a pipe pile mold is cleaned, an acrylate solution is sprayed, prestress tensioning treatment is carried out, the mixed material is poured into the pipe pile mold, centrifugal treatment, normal-pressure steam curing and mold dismounting are carried out, and a finished concrete pipe pile is obtained; the concrete has the advantages of high strength, good crack resistance and good durability.

Description

Technical Field

[0001] The present application relates to the field of concrete, and more specifically, to a C100 autoclave-free machine-made sand concrete pipe pile and a preparation method thereof. Background Art

[0002] Concrete pipe piles are made by casting concrete. Concrete pipe piles with a strength of C100 are made of a high-strength concrete, which is made of cement, sand, stone, superplasticizer and other admixtures, and mineral admixtures such as fly ash, ultrafine slag, and silica fume. However, during the preparation of C100 concrete pipe piles, cracking often occurs due to hardening shrinkage and temperature difference, and the problem of pile body cracking is also likely to occur during the autoclaving process, affecting the structural safety of the concrete pipe piles.

[0003] Currently, fiber-reinforced concrete is often used to improve the structural stability of C100 concrete pipe piles. However, the dispersion uniformity of the fibers is not good, and the bonding stability between the fibers and the concrete is not good, which limits the crack resistance and durability of C100 concrete.

[0004] Therefore, how to prepare a new type of concrete pipe pile so that the fibers have good dispersion uniformity in the concrete, and improve the bonding force between the fibers and the concrete, so that the concrete pipe pile has the advantages of high strength, good crack resistance and good durability, is a problem to be solved. Summary of the Invention

[0005] In order to prepare a new type of concrete pipe pile so that the fibers have good dispersion uniformity in the concrete, and improve the bonding force between the fibers and the concrete, so that the concrete pipe pile has the advantages of high strength, good crack resistance and good durability, the present application provides a C100 autoclave-free machine-made sand concrete pipe pile and a preparation method thereof.

[0006] In the first aspect, the present application provides a C100 autoclave-free machine-made sand concrete pipe pile, adopting the following technical solution: A C100 autoclave-free machine-made sand concrete pipe pile, the concrete pipe pile contains the following raw materials in parts by weight: 400-430 parts of cement, 1100-1250 parts of crushed stone, 700-780 parts of machine-made sand, 72-78 parts of mineral powder, 40-50 parts of fly ash, 4.2-4.8 parts of water reducing agent, 145-158 parts of water, 0.2-0.25 parts of interfacial agent, 20-25 parts of filling fiber, 25-35 parts of filler, 0.2-0.22 parts of air-entraining agent; The filling fiber is prepared from a fiber material, ethyl hydroxycellulose and a cetyl stearyl alcohol solution with a mass ratio of 1:0.1-0.15:0.1-0.2.

[0007] By adopting the above technical solutions, cement, crushed stones, manufactured sand, mineral powder, and fly ash are combined to make the concrete pipe pile have relatively high strength. With the addition of filling fibers and fillers, the strength of the concrete pipe pile is further enhanced, and a high-strength concrete pipe pile is obtained.

[0008] The fiber material, ethyl hydroxycellulose, cetyl stearyl alcohol, and interfacial agent are combined. By utilizing the good lubricating effect of cetyl stearyl alcohol on the outermost surface of the fiber material, during the raw material mixing stage, it promotes the uniform mixing of the fiber material with substances such as cementitious materials, manufactured sand, and crushed stones, improving the mixing uniformity of the fiber material. As the concrete pipe pile undergoes centrifugation and steam curing, when the temperature reaches the melting point of cetyl stearyl alcohol, cetyl stearyl alcohol melts and flows, and ethyl hydroxycellulose comes into contact with water. By utilizing the water-soluble adhesiveness of ethyl hydroxycellulose, the bonding effect between the fiber material and cementitious materials, crushed stones, and manufactured sand is improved. In combination with the interfacial agent, the bonding effect between the filled fibers and cementitious materials, crushed stones, and manufactured sand is further improved, enhancing the bonding force between the fibers and the concrete, thereby improving the structural density of the concrete pipe pile, making the concrete pipe pile have the advantages of high strength and good crack resistance.

[0009] Ethyl hydroxycellulose, cetyl stearyl alcohol, and interfacial agent are combined. During the autoclave molding process of the concrete pipe pile, the ethyl hydroxycellulose on the surface of the concrete pipe pile is conducive to forming a film layer. In combination with the waterproof effect of cetyl stearyl alcohol, the water resistance of the concrete pipe pile is further improved, thereby enhancing the durability of the concrete pipe pile.

[0010] Preferably, the fiber material is composed of loaded basalt fiber and loaded silicon carbide fiber with a mass ratio of 1:1 - 2.

[0011] By adopting the above technical solutions, the loaded basalt fiber and loaded silicon carbide fiber are combined. By utilizing the good tensile strength and flexibility of basalt fiber and silicon carbide fiber, when the concrete is subjected to external forces, the fibers can absorb and bear part of the external forces, thereby delaying the concrete failure process and improving the crack resistance of the concrete. Moreover, basalt fiber and silicon carbide fiber have good heat resistance and can resist the external temperature during steam curing, ensuring that the concrete is not prone to cracking problems during the steam curing process of the concrete pipe pile and extending the service life of the concrete pipe pile.

[0012] Preferably, the loaded basalt fiber is prepared from basalt fiber, polyacrylamide solution, and xylitol fatty acid ester with a mass ratio of 1:0.1 - 0.3:0.1 - 0.2.

[0013] By adopting the above technical solution, the xylitol fatty acid ester is bonded to the surface of the basalt fiber by using the viscosity of the polyacrylamide solution. The lubricating effect of the xylitol fatty acid ester on the outer surface of the basalt fiber facilitates the uniform dispersion of the basalt fiber in the concrete mixture. During the hydration process and the centrifugal steam curing process, since the xylitol fatty acid ester is not easily soluble in normal temperature water but is easily dispersed in hot water to form an emulsion, the xylitol fatty acid ester generates viscosity to cooperate with the water absorption and bonding effect of the polyacrylamide solution, further improving the bonding effect between the basalt fiber and the cementitious material, gravel, and manufactured sand, thereby improving the density of the concrete pipe pile structure and making the concrete pipe pile have the advantages of high strength, good crack resistance, and good durability.

[0014] Preferably, the loaded silicon carbide fiber is prepared from silicon carbide fiber, fucoidan solution, and alginate-1,2-propanediol ester with a mass ratio of 1:0.05 - 0.1:0.05 - 0.1.

[0015] By adopting the above technical solution, the alginate-1,2-propanediol ester is bonded to the surface of the silicon carbide fiber filaments by using the viscosity of the fucoidan solution. The alginate-1,2-propanediol ester is soluble in hot water. During the centrifugation and autoclave heating process of the concrete pipe pile, the alginate-1,2-propanediol ester gradually dissolves and releases fucoidan. The fucoidan absorbs the excess mixing water to generate a bonding effect and cooperate with the bonding effect of the alginate-1,2-propanediol ester, further improving the bonding effect between the silicon carbide fiber and the cementitious material, gravel, and manufactured sand, thereby improving the density of the internal structure of the concrete and making the concrete have the advantages of high strength and good crack resistance.

[0016] Preferably, the interfacial agent is a fatty alcohol modified epoxy resin.

[0017] By adopting the above technical solution, the carboxyl group in the fatty alcohol modified epoxy resin is connected to the hydroxyl group and amide group on the surface of the loaded basalt fiber and the hydroxyl group and carboxyl group on the surface of the loaded silicon carbide fiber, further improving the bonding effect of the filler fiber in the concrete, improving the density of the concrete pipe pile structure, and thus improving the strength and crack resistance of the concrete pipe pile.

[0018] Preferably, the gravel is prepared from gravel particles, linseed gum microparticles, and cetearyl alcohol melt with a mass ratio of 100:0.2 - 0.5:0.1 - 0.3.

[0019] By adopting the above technical solution, during the raw material mixing and stirring process, the lubricating effect of cetearyl alcohol on the surface of gravel is utilized in combination with xylitol fatty acid ester and alginic acid-1,2-propylene glycol ester on the surface of the filling fiber, facilitating the uniform dispersion of the filling fiber in the gravel; the cetearyl alcohol solution on the surface of the gravel coats the flaxseed gum microparticles. The melting point of cetearyl alcohol is about 50 °C. During the hydration and steam curing processes of the concrete pipe pile, the cetearyl alcohol melts and releases the flaxseed gum microparticles. The flaxseed gum microparticles absorb the excess mixing water to generate viscosity, and in combination with groups such as hydroxyl and carboxyl groups on the surface of the filling fiber, further improve the bonding effect between the gravel and the filling fiber, enhancing the strength, crack resistance, and durability of the concrete pipe pile.

[0020] Preferably, the filler is prepared from basalt microparticles, quartz sand microparticles, and ethyl hydroxycellulose solution with a mass ratio of 1:0.5 - 1:0.1 - 0.5.

[0021] By adopting the above technical solution, the ethyl hydroxycellulose solution adheres to the surfaces of the basalt microparticles and quartz sand microparticles. The hydroxyl groups in the ethyl hydroxycellulose cooperate with substances such as hydroxyl and carboxyl groups on the surface of the filling fiber to improve the connection effect between the filler and the filling fiber, and further improve the uniform dispersion degree of the filler in the concrete in combination with the hydroxyl groups on the surface of the gravel; during the steam curing process, it can improve the bonding effect between the basalt microparticles and the quartz sand microparticles, thereby enhancing the density of the concrete structure, making the concrete have the advantages of high strength, good crack resistance, and good durability.

[0022] Preferably, the water reducing agent is a polycarboxylate superplasticizer.

[0023] By adopting the above technical solution, the polycarboxylate superplasticizer is used in combination with centrifugal treatment to further ensure the hydration effect of the concrete pipe pile, thereby making the concrete have the advantages of high strength, good crack resistance, and good durability.

[0024] In the second aspect, the present application provides a preparation method for a C100 autoclave-free machine-made sand concrete pipe pile, adopting the following technical solution: A preparation method for a C100 autoclave-free machine-made sand concrete pipe pile includes the following steps: S1. Weigh cement, gravel, machine-made sand, mineral powder, and fly ash, mix and stir them evenly, then add an interfacial agent, filling fiber, and filler, continue to mix and stir evenly, and finally add water, water reducing agent, and air-entraining agent, and mix and stir evenly to obtain a mixture. S2. After cleaning the pipe pile mold, evenly spray an acrylate solution, then perform prestressed tensioning treatment on the pipe pile mold, pour the mixture into the pipe pile mold, and perform centrifugal treatment. During the centrifugal treatment process, the temperature is 75 - 85 °C to obtain a semi-finished product. S3. The semi-finished product is subjected to normal-pressure steam curing and the mold is disassembled to obtain a finished concrete pipe pile.

[0025] By adopting the above technical solution, in the acrylic ester solution sprayed on the surface of the pipe pile mold, during the heating and centrifuging process, the acrylic ester cooperates with the ethyl hydroxycellulose on the surface of the fiber material to promote the formation of a film layer on the contact surface between the pipe pile mold and the concrete. In combination with the cetyl alcohol on the surface of the crushed stones on the concrete surface, the flaxseed gum particles and the polycaprolactone on the surface of the manufactured sand, it further promotes the formation of the film layer, which not only facilitates demolding but also improves the waterproof effect of the concrete pipe pile. During the centrifuging process, the moisture inside the concrete pipe pile will be transferred to the external environment through the surface, so as to ensure that the flaxseed gum particles on the crushed stones on the concrete surface absorb water and generate viscosity and ensure that the polycaprolactone and cetyl alcohol melt during the heating and centrifuging process, thus ensuring that the surface structure of the concrete is dense and has good water resistance, and extending the service life of the concrete pipe pile.

[0026] Preferably, the acrylic ester solution in S2 is prepared by the following method: The acrylic ester is placed in ethanol and stirred and dissolved according to a mass ratio of 1:95 - 105 to obtain a solution, and then eugenol and glycerol are added and mixed and stirred evenly. The mass ratio of the acrylic ester, eugenol and glycerol is 1:0.1 - 0.2:0.1 - 0.2 to obtain the acrylic ester solution.

[0027] By adopting the above technical solution, the acrylic ester, eugenol and glycerol are all soluble in ethanol. The hydrophilic groups in the acrylic ester solution are used to connect with substances such as ethyl hydroxycellulose and flaxseed gum particles on the concrete surface, while the hydrophobic agent faces outward. In combination with the plasticizing effect and heating effect of glycerol, it is convenient to form a cross-linked film layer on the concrete surface, making the film layer have good strength and toughness. At the same time, the film layer closely adheres to the concrete surface and can penetrate into the micropores on the concrete surface, improving the density and impermeability of the concrete. In combination with the hydrophobic effect of eugenol, it further improves the water resistance of the surface of the concrete pipe pile, improves the strength and crack resistance of the concrete while making the concrete have good water resistance, and extends the service life of the concrete pipe pile.

[0028] In summary, the present application has the following beneficial effects: 1. The combination of cement, crushed stones, manufactured sand, mineral powder and fly ash makes the concrete pipe pile have relatively high strength. In combination with the filling fibers and fillers, it further enhances the strength of the concrete pipe pile, and a high-strength concrete pipe pile is prepared.

[0029] 2. The fiber material, ethyl hydroxycellulose, cetearyl alcohol, and surfactant are combined. Utilizing the good lubricating effect of cetearyl alcohol on the outermost surface of the fiber material, during the raw material mixing stage, it promotes the uniform mixing of the fiber material with substances such as cementitious materials, manufactured sand, and gravel, improving the mixing uniformity of the fiber material. With the centrifugation and steam curing of the concrete pipe pile, using the water-soluble adhesiveness of ethyl hydroxycellulose, it improves the bonding effect between the fiber material and cementitious materials, gravel, and manufactured sand. In combination with the surfactant, it further improves the bonding effect between the filled fiber and cementitious materials, gravel, and manufactured sand, enhancing the bonding force between the fiber and the concrete, thereby improving the structural density of the concrete pipe pile and endowing the concrete pipe pile with the advantages of high strength and good crack resistance. Specific Embodiments

[0030] The following further elaborates on the present application in conjunction with embodiments.

[0031] The following raw materials are all commercially available.

[0032] Preparation Example of Filled Fiber Preparation Example 1: The filled fiber is prepared by the following method: On the surface of 1 kg of basalt fiber, 0.2 kg of polyimide solution is evenly sprayed. The average length of the basalt fiber is 2 mm, and the polyimide solution is a 1% by mass aqueous solution of polyimide. Then, 0.15 kg of xylitol fatty acid ester is added on the surface, and the addition rate of xylitol fatty acid ester is 60 g / min. During the addition process, the basalt fiber is continuously stirred at a rotation speed of 120 r / min. After mixing evenly, it is dried and dispersed until the basalt fibers do not adhere and agglomerate with each other, obtaining the loaded basalt fiber; On the surface of 1 kg of silicon carbide fiber, 0.08 kg of fucoidan solution is evenly sprayed. The average length of the silicon carbide fiber is 2 mm, and the fucoidan solution is a 1% by mass aqueous solution of fucoidan. Then, 0.07 kg of alginate - 1,2 - propanediol ester is added, and the addition rate of alginate - 1,2 - propanediol ester is 60 g / min. During the addition process, the silicon carbide fiber is continuously stirred at a rotation speed of 120 r / min. After mixing evenly, it is dried and dispersed until the silicon carbide fibers do not adhere and agglomerate with each other, obtaining the loaded silicon carbide fiber; 1 kg of the loaded basalt fiber and 1.5 kg of the loaded silicon carbide fiber are mixed and stirred evenly to obtain the fiber material; on the surface of 0.12 kg of ethyl hydroxycellulose, 0.15 kg of cetearyl alcohol melt solution is evenly sprayed. The ethyl hydroxycellulose passes through a 500 - mesh sieve, and the cetearyl alcohol melt solution is prepared by melting cetearyl alcohol at 60 °C. Then, it is added to the surface of 1 kg of the fiber material. During the addition process, the fiber material is continuously stirred at a rotation speed of 200 r / min. After mixing evenly, it is dried and dispersed to obtain the filled fiber, and the average length of the filled fiber is less than 3 mm.

[0033] Preparation Example 2: The difference between this preparation example and Preparation Example 1 is that: 0.1 kg of polyimide solution was evenly sprayed on the surface of 1 kg of basalt fibers. The average length of the basalt fibers was 2 mm, and the polyimide solution was an aqueous solution of polyimide with a mass fraction of 1%. Then, 0.1 kg of xylitol fatty acid ester was added to the surface. The addition rate of xylitol fatty acid ester was 60 g / min. During the addition process, the basalt fibers were continuously stirred at a rotation speed of 120 r / min. After being mixed evenly, they were dried and dispersed until the basalt fibers did not stick to each other and agglomerate, obtaining the loaded basalt fibers; 0.05 kg of fucoidan solution was evenly sprayed on the surface of 1 kg of silicon carbide fibers. The average length of the silicon carbide fibers was 2 mm, and the fucoidan solution was an aqueous solution of fucoidan with a mass fraction of 1%. Then, 0.05 kg of alginic acid - 1,2 - propanediol ester was added. The addition rate of alginic acid - 1,2 - propanediol ester was 60 g / min. During the addition process, the silicon carbide fibers were continuously stirred at a rotation speed of 120 r / min. After being mixed evenly, they were dried and dispersed until the silicon carbide fibers did not stick to each other and agglomerate, obtaining the loaded silicon carbide fibers; 1 kg of the loaded basalt fibers and 1 kg of the loaded silicon carbide fibers were mixed and stirred evenly to obtain the fiber material; 0.1 kg of cetostearyl alcohol melt was evenly sprayed on the surface of 0.1 kg of ethyl hydroxycellulose. The ethyl hydroxycellulose passed through a 500 - mesh sieve, and the cetostearyl alcohol melt was prepared by melting cetostearyl alcohol at 60 °C; then it was added to the surface of 1 kg of the fiber material. During the addition process, the fiber material was continuously stirred at a rotation speed of 200 r / min. After being mixed evenly, they were dried and dispersed to obtain the filled fibers, and the average length of the filled fibers was less than 3 mm.

[0034] Preparation Example 3: The difference between this preparation example and Preparation Example 1 is that: 0.3 kg of polyimide solution was evenly sprayed on the surface of 1 kg of basalt fibers. The average length of the basalt fibers was 2 mm, and the polyimide solution was an aqueous solution of polyimide with a mass fraction of 1%. Then, 0.2 kg of xylitol fatty acid ester was added to the surface. The addition rate of xylitol fatty acid ester was 60 g / min. During the addition process, the basalt fibers were continuously stirred at a rotation speed of 120 r / min. After being mixed evenly, they were dried and dispersed until the basalt fibers did not stick to each other and agglomerate, obtaining the loaded basalt fibers; 0.1 kg of fucoidan solution was evenly sprayed on the surface of 1 kg of silicon carbide fibers. The average length of the silicon carbide fibers was 2 mm, and the fucoidan solution was an aqueous solution of fucoidan with a mass fraction of 1%. Then, 0.1 kg of alginic acid - 1,2 - propanediol ester was added. The addition rate of alginic acid - 1,2 - propanediol ester was 60 g / min. During the addition process, the silicon carbide fibers were continuously stirred at a rotation speed of 120 r / min. After being mixed evenly, they were dried and dispersed until the silicon carbide fibers did not stick to each other and agglomerate, obtaining the loaded silicon carbide fibers; Mix 1 kg of loaded basalt fibers and 2 kg of loaded silicon carbide fibers evenly by stirring to obtain fiber material. Uniformly spray 0.2 kg of cetyl alcohol melt solution on the surface of 0.15 kg of ethyl hydroxycellulose. The ethyl hydroxycellulose passes through a 500-mesh sieve, and the cetyl alcohol melt solution is obtained by heating cetyl alcohol to 60 °C for hot melting. Then add it to the surface of 1 kg of fiber material. During the addition process, the fiber material is continuously stirred at a speed of 200 r / min. After mixing evenly, through drying and dispersion, filled fibers are obtained, and the average length of the filled fibers is less than 3 mm.

[0035] Preparation Example of Crushed Stones Preparation Example 4: The crushed stones are prepared by the following method: Uniformly spray 0.2 kg of cetyl alcohol melt solution on the surface of 0.3 kg of flaxseed gum microparticles. The flaxseed gum microparticles pass through a 425-mesh sieve, and the cetyl alcohol melt solution is obtained by heating cetyl alcohol to 60 °C for hot melting to obtain a composite material. Add the composite material to the surface of 100 kg of crushed stone particles at an addition speed of 100 g / min. During the addition process, the crushed stone particles are stirred at a speed of 40 r / min to obtain crushed stones. The particle size of the crushed stone particles is a continuous gradation of 5 - 25 mm, and the mud content is < 1%.

[0036] Preparation Example 5: The difference between this preparation example and Preparation Example 4 is that: Uniformly spray 0.1 kg of cetyl alcohol melt solution on the surface of 0.2 kg of flaxseed gum microparticles. The flaxseed gum microparticles pass through a 425-mesh sieve, and the cetyl alcohol melt solution is obtained by heating cetyl alcohol to 60 °C for hot melting to obtain a composite material. Add the composite material to the surface of 100 kg of crushed stone particles at an addition speed of 100 g / min. During the addition process, the crushed stone particles are stirred at a speed of 40 r / min to obtain crushed stones.

[0037] Preparation Example 6: The difference between this preparation example and Preparation Example 4 is that: Uniformly spray 0.3 kg of cetyl alcohol melt solution on the surface of 0.5 kg of flaxseed gum microparticles. The flaxseed gum microparticles pass through a 425-mesh sieve, and the cetyl alcohol melt solution is obtained by heating cetyl alcohol to 60 °C for hot melting to obtain a composite material. Add the composite material to the surface of 100 kg of crushed stone particles at an addition speed of 100 g / min. During the addition process, the crushed stone particles are stirred at a speed of 40 r / min to obtain crushed stones.

[0038] Preparation Example of Filler Preparation Example 7: The filler is prepared by the following method: 0.4 kg of ethyl hydroxycellulose solution was evenly sprayed on the surfaces of 1 kg of basalt particles and 0.8 kg of quartz sand particles. The ethyl hydroxycellulose solution was an aqueous solution of ethyl hydroxycellulose with a mass fraction of 1%. The average particle size of the basalt particles was 80 μm, and the average particle size of the quartz sand particles was 40 μm. After mixing evenly, it was dried and dispersed until the basalt particles and quartz sand particles did not adhere or agglomerate to obtain a filler.

[0039] Preparation Example 8: The difference between this comparative example and Example 7 is as follows: 0.5 kg of ethyl hydroxycellulose solution was evenly sprayed on the surfaces of 1 kg of basalt particles and 0.5 kg of quartz sand particles. The ethyl hydroxycellulose solution was an aqueous solution of ethyl hydroxycellulose with a mass fraction of 1%. The average particle size of the basalt particles was 80 μm, and the average particle size of the quartz sand particles was 40 μm. After mixing evenly, it was dried and dispersed until the basalt particles and quartz sand particles did not adhere or agglomerate to obtain a filler.

[0040] Preparation Example 9: The difference between this comparative example and Example 7 is as follows: 0.5 kg of ethyl hydroxycellulose solution was evenly sprayed on the surfaces of 1 kg of basalt particles and 1 kg of quartz sand particles. The ethyl hydroxycellulose solution was an aqueous solution of ethyl hydroxycellulose with a mass fraction of 1%. The average particle size of the basalt particles was 80 μm, and the average particle size of the quartz sand particles was 40 μm. After mixing evenly, it was dried and dispersed until the basalt particles and quartz sand particles did not adhere or agglomerate to obtain a filler.

[0041] Preparation Examples of Acrylate Solution Preparation Example 10: The acrylate solution was prepared by the following method: 1 kg of acrylate solution was placed in 99 kg of ethanol and stirred until dissolved. The mass fraction of ethanol was 99% to obtain a solution. Then, 0.15 kg of eugenol and 0.15 kg of glycerol were added and the mixture was continuously stirred evenly to obtain an acrylate solution.

[0042] Preparation Example 11: The difference between this preparation example and Preparation Example 10 is as follows: 1 kg of acrylate solution was placed in 95 kg of ethanol and stirred until dissolved to obtain a solution. Then, 0.1 kg of eugenol and 0.1 kg of glycerol were added and the mixture was continuously stirred evenly to obtain an acrylate solution.

[0043] Preparation Example 12: The difference between this preparation example and Preparation Example 10 is as follows: 1 kg of acrylate solution was placed in 105 kg of ethanol and stirred until dissolved to obtain a solution. Then, 0.2 kg of eugenol and 0.2 kg of glycerol were added and the mixture was continuously stirred evenly to obtain an acrylate solution. Examples

[0044] Among the following raw materials, the polycarboxylate superplasticizer was purchased from Jinan Shanhaichem Technology Co., Ltd.; the triterpenoid saponin was purchased from Shandong Jinghu South United Petrochemical Co., Ltd.; other raw materials are all commonly available in the market.

[0045] Example 1: A C100 non-steam-cured machine-made sand concrete pipe pile: 415 kg of cement, 1185 kg of crushed stone, 740 kg of machine-made sand, 75 kg of mineral powder, 45 kg of fly ash, 4.5 kg of superplasticizer, 152 kg of water, 0.22 kg of interfacial agent, 22 kg of filling fiber, 30 kg of filler, 0.21 kg of air-entraining agent; the cement is ordinary Portland cement of P.O.42.5; the crushed stone is the crushed stone prepared in Preparation Example 4; the machine-made sand has a continuous gradation of 0.25 - 0.5 mm and a mud content of <1.0%; the mineral powder is S95 grade slag powder with a density of 2.8 g / cm 3 , a specific surface area of 420 m 2 / kg, and a water content of 0.2%; the fineness (residue on 45μm square hole sieve) of fly ash is 8%, the loss on ignition is <4.5%, and the water content is <0.2%; the superplasticizer is polycarboxylate superplasticizer; the interfacial agent is fatty alcohol modified epoxy resin; the filling fiber is the filling fiber prepared in Preparation Example 1, and the filler is the filler prepared in Preparation Example 7; the air-entraining agent is triterpenoid saponin; The preparation method is as follows: S1. Weigh the cement, crushed stone, machine-made sand, mineral powder, and fly ash, mix and stir evenly, then add the interfacial agent, filling fiber, and filler, continue to mix and stir evenly, and finally add water, superplasticizer, and air-entraining agent and mix and stir evenly to obtain the mixture. S2. After cleaning the pipe pile mold, evenly spray the acrylate solution prepared in Preparation Example 10 on the specific surface, spray 20 mL of acrylate solution per square meter of the mold surface, then perform prestress tensioning treatment on the pipe pile mold, pour the mixture into the pipe pile mold, and perform centrifugation. Centrifuge for 2 minutes under the condition of a centrifugal speed of 250 r / min, then increase to a centrifugal speed of 500 r / min and centrifuge for 5 minutes, and then increase to a centrifugal speed of 650 r / min and centrifuge for 3 minutes. The centrifugation temperature is 80°C to obtain the semi-finished product. S3. Steam-cure the semi-finished product at normal pressure of 70°C for 8 hours. After the steam-curing is completed, disassemble the mold to obtain the finished concrete pipe pile.

[0046] Example 2: The difference between this example and Example 1 is: 400 kg of cement, 1100 kg of crushed stone, 700 kg of manufactured sand, 72 kg of mineral powder, 40 kg of fly ash, 4.2 kg of water reducing agent, 145 kg of water, 0.2 kg of interfacial agent, 20 kg of filling fiber, 25 kg of filler, 0.2 kg of air entraining agent; the crushed stone is the crushed stone prepared in Preparation Example 5; the filling fiber is the filling fiber prepared in Preparation Example 2, and the filler is the filler prepared in Preparation Example 8; During the preparation example process: S2. After cleaning the pipe pile mold, uniformly spray the acrylate solution prepared in Preparation Example 11 on the specific surface, spray 20 mL of acrylate solution on the surface of each square meter of the mold, then perform prestress tensioning treatment on the pipe pile mold, pour the mixture into the pipe pile mold, perform centrifugation treatment, centrifuge for 2 minutes under the condition of a centrifugal speed of 250 r / min, then increase to a centrifugal speed of 500 r / min and centrifuge for 5 minutes, and then increase to a centrifugal speed of 650 r / min and centrifuge for 3 minutes, and the centrifugation temperature is 70 °C to obtain a semi-finished product.

[0047] Example 3: The difference between this example and Example 1 is that: 430 kg of cement, 1250 kg of crushed stone, 780 kg of manufactured sand, 78 kg of mineral powder, 50 kg of fly ash, 4.8 kg of water reducing agent, 158 kg of water, 0.25 kg of interfacial agent, 25 kg of filling fiber, 35 kg of filler, 0.22 kg of air entraining agent; the crushed stone is the crushed stone prepared in Preparation Example 6; the filling fiber is the filling fiber prepared in Preparation Example 3, and the filler is the filler prepared in Preparation Example 9; During the preparation example process: S2. After cleaning the pipe pile mold, uniformly spray the acrylate solution prepared in Preparation Example 12 on the specific surface, spray 20 mL of acrylate solution on the surface of each square meter of the mold, then perform prestress tensioning treatment on the pipe pile mold, pour the mixture into the pipe pile mold, perform centrifugation treatment, centrifuge for 2 minutes under the condition of a centrifugal speed of 250 r / min, then increase to a centrifugal speed of 500 r / min and centrifuge for 5 minutes, and then increase to a centrifugal speed of 650 r / min and centrifuge for 3 minutes, and the centrifugation temperature is 85 °C to obtain a semi-finished product.

[0048] Preparation Example 4: The difference between this example and Example 1 is that: The fiber material is commercially available basalt fiber and silicon carbide fiber.

[0049] Preparation Example 5: The difference between this example and Example 1 is that: Xylitol fatty acid ester was not added during the preparation process of the carrier basalt fiber in the fiber material, and propylene glycol alginate was not added during the preparation process of the carrier silicon carbide fiber.

[0050] Preparation Example 6: The difference between this example and Example 1 is that: Cetearyl alcohol and flaxseed gum microparticles were not added during the preparation of the crushed stones.

[0051] Preparation Example 7: The difference between this example and Example 1 is that: Ethyl hydroxycellulose solution was not added during the preparation of the filler.

[0052] Preparation Example 8: The difference between this example and Example 1 is that: Eugenol and glycerol were not added during the preparation of the acrylate solution.

[0053] Preparation Example 9: The difference between this example and Example 1 is that: The interfacial agent is epoxy resin.

[0054] Comparative Example Comparative Example 1: The difference between this comparative example and Example 1 is that: The filling fiber is basalt fiber.

[0055] Comparative Example 2: The difference between this comparative example and Example 1 is that: The centrifugation temperature in S2 is 28 °C.

[0056] Performance Detection Test 1. Strength Detection The concrete pipe piles were prepared by the methods of Examples 1-9 and Comparative Examples 1-2 respectively, and the 28-day compressive strength was detected with reference to GB / T50081, and the data were recorded.

[0057] 2. Crack Resistance Detection The concrete pipe piles were prepared by the methods of Examples 1-9 and Comparative Examples 1-2 respectively, and the total cracking area per unit area after forming was detected with reference to GB / T50081, and the data were recorded.

[0058] 3. Water Resistance Detection The concrete pipe piles were prepared by the methods of Examples 1-9 and Comparative Examples 1-2 respectively, and the anti-seepage pressure was detected with reference to GB / T50082, and the data were recorded.

[0059] Table 1 Performance Test Table Project Compressive strength / MPa <![CDATA[Cracking area / mm 2 / m 2 > Impermeability pressure / MPa Example 1 104.2 95.8 4.7 Example 2 102.6 96.3 4.5 Example 3 104.7 95.4 4.8 Example 4 93.5 145.2 3.4 Example 5 97.3 128.5 3.9 Example 6 91.8 167.9 3.1 Example 7 95.0 137.6 3.6 Example 8 100.6 108.7 4.2 Example 9 98.4 114.2 4.0 Comparative example 1 88.0 200.5 2.6 Comparative example 2 99.2 110.8 4.1 Combined with Examples 1-3 and Table 1, it can be seen that the concrete pipe piles prepared in this application have high strength, good crack resistance and good water permeability resistance, making the concrete pipe piles have good durability.

[0060] Combined with Example 1 and Examples 4 - 9 and in combination with Table 1, it can be seen that in Example 4, the fiber materials are ordinary commercially available basalt fibers and silicon carbide fibers. Compared with Example 1, the compressive strength of the concrete pipe piles prepared in Example 4 is lower than that in Example 1, the cracking area is larger than that in Example 1, and the anti-seepage pressure is lower than that in Example 1. This shows that the treated loaded basalt fibers and loaded silicon carbide fibers can promote uniform dispersion in the concrete while improving the bonding effect between the cementitious materials and the fibers in the concrete, thereby enhancing the strength, crack resistance, and water resistance of the concrete pipe piles.

[0061] In Example 5, xylitol fatty acid ester was not added during the preparation process of the loaded basalt fibers in the fiber materials, and propylene glycol alginate was not added during the preparation process of the loaded silicon carbide fibers. Compared with Example 1, the compressive strength of the concrete pipe piles prepared in Example 5 is lower than that in Example 1, the cracking area is larger than that in Example 1, and the anti-seepage pressure is lower than that in Example 1. This shows that the addition of xylitol fatty acid ester and propylene glycol alginate can improve the uniform dispersion degree of the fibers in the concrete, and during the steam curing process, it can utilize fucoidan and polyacrylamide solution to enhance the bonding between the fibers and the cementitious materials, gravel, etc. in the concrete, thereby enhancing the strength, crack resistance, and water resistance of the concrete.

[0062] In Example 6, cetearyl alcohol and flaxseed gum microparticles were not added during the preparation process of the gravel. Compared with Example 1, the compressive strength of the concrete pipe piles prepared in Example 6 is lower than that in Example 1, the cracking area is larger than that in Example 1, and the anti-seepage pressure is lower than that in Example 1. This shows that after the surface of the gravel is treated with cetearyl alcohol and flaxseed gum microparticles, it can improve the bonding effect between the gravel and the filled fibers and cementitious materials, thereby enhancing the strength, crack resistance, and water resistance of the concrete.

[0063] In Example 7, ethyl hydroxycellulose solution was not added during the preparation process of the filler. Compared with Example 1, the compressive strength of the concrete pipe piles prepared in Example 7 is lower than that in Example 1, the cracking area is larger than that in Example 1, and the anti-seepage pressure is lower than that in Example 1. This shows that the addition of ethyl hydroxycellulose solution can promote the bonding between the filler and the filled fibers, cementitious materials, aggregates, etc., thereby enhancing the strength, crack resistance, and durability of the concrete pipe piles.

[0064] In Example 8, eugenol and glycerol were not added during the preparation process of the acrylate solution. Compared with Example 1, the compressive strength of the concrete pipe piles prepared in Example 8 is lower than that in Example 1, the cracking area is larger than that in Example 1, and the anti-seepage pressure is lower than that in Example 1. This shows that the addition of eugenol and glycerol can improve the strength, crack resistance, and water resistance of the surface of the concrete pipe piles, thereby extending the durability of the concrete pipe piles.

[0065] In Example 9, the interfacial agent is epoxy resin. Compared with Example 1, the compressive strength of the concrete pipe pile prepared in Example 9 is lower than that in Example 1, the cracking area is larger than that in Example 1, and the impermeability pressure is lower than that in Example 1. This shows that the fatty alcohol-modified epoxy resin can improve the bonding effect between the filled fiber, filler and cementitious material, and gravel, thereby improving the strength, crack resistance and water resistance of the concrete and prolonging the durability of the concrete.

[0066] Combining Example 1 and Comparative Example 1 and referring to Table 1, it can be seen that in Comparative Example 1, the filled fiber is basalt fiber. Compared with Example 1, the compressive strength of the concrete pipe pile prepared in Comparative Example 1 is lower than that in Example 1, the cracking area is larger than that in Example 1, and the impermeability pressure is lower than that in Example 1. This shows that treating the fiber material with ethyl hydroxycellulose and cetyl stearyl alcohol solution can improve the bonding effect between the fiber material and the concrete cementitious material and gravel, thereby improving the strength, crack resistance and durability of the concrete.

[0067] In Comparative Example 2, the centrifugation temperature is 28°C. Compared with Example 1, the compressive strength of the concrete pipe pile prepared in Comparative Example 2 is lower than that in Example 1, the cracking area is larger than that in Example 1, and the impermeability pressure is lower than that in Example 1. This shows that when the centrifugation temperature is relatively high, the moisture inside the concrete pipe pile promotes the formation of a film layer on the surface of the concrete pipe pile during the centrifugal separation process, improving the strength, crack resistance and water resistance of the surface of the concrete pipe pile.

[0068] This specific embodiment is only an explanation of the present application and does not limit the present application. Those skilled in the art can make modifications to this embodiment without creative contributions according to their needs after reading this specification, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A C100 autoclave-free machine-made sand concrete pipe pile, characterized in that: The concrete pipe pile comprises the following raw materials in parts by weight: 400-430 parts of cement, 1100-1250 parts of crushed stone, 700-780 parts of machine-made sand, 72-78 parts of mineral powder, 40-50 parts of fly ash, 4.2-4.8 parts of water reducer, 145-158 parts of water, 0.2-0.25 parts of interface agent, 20-25 parts of filling fiber, 25-35 parts of filler, and 0.2-0.22 parts of air entraining agent; the filling fiber is prepared from fiber material, ethyl hydroxy cellulose and cetearyl alcohol melt in a mass ratio of 1:0.1-0.15:0.1-0.

2.

2. The C100 autoclave-free machine-made sand concrete pipe pile according to claim 1, characterized in that: The fiber material consists of loaded basalt fiber and loaded silicon carbide fiber in a mass ratio of 1:1-2.

3. The C100 autoclave-free machine-made sand concrete pipe pile according to claim 2, characterized in that: The loaded basalt fiber is prepared from basalt fiber, polyacrylamide solution and xylitol fatty acid ester in a mass ratio of 1:0.1-0.3:0.1-0.

2.

4. The C100 autoclave-free machine-made sand concrete pipe pile according to claim 2, characterized in that: The loaded silicon carbide fiber is prepared from silicon carbide fiber, fucoidan solution and 1,2-propylene glycol alginate in a mass ratio of 1:0.05-0.1:0.05-0.

1.

5. The C100 autoclave-free machine-made sand concrete pipe pile according to claim 1, characterized in that: The interface agent is fatty alcohol modified epoxy resin.

6. The C100 autoclave-free machine-made sand concrete pipe pile according to claim 1, characterized in that: The crushed stone is prepared from crushed stone particles, flaxseed colloid particles and cetearyl alcohol melt in a mass ratio of 100:0.2-0.5:0.1-0.

3.

7. The C100 autoclave-free machine-made sand concrete pipe pile according to claim 1, characterized in that: The filler is prepared from basalt particles, quartz sand particles and ethyl hydroxycellulose solution in a mass ratio of 1:0.5-1:0.1-0.

5.

8. The C100 autoclave-free machine-made sand concrete pipe pile according to claim 1, characterized in that: The water reducer is a polycarboxylic acid high-efficiency water reducer.

9. The method for preparing C100 autoclave-free machine-made sand concrete pipe pile according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Weigh cement, crushed stone, machine-made sand, mineral powder and fly ash, mix and stir evenly, then add interface agent, filling fiber and filler, continue to mix and stir evenly, and finally add water, water reducing agent and air entraining agent, mix and stir evenly to obtain a mixed material; S2, after cleaning the pipe pile mold, evenly spraying the acrylic ester solution, then prestressing the pipe pile mold, pouring the mixed material into the pipe pile mold, and centrifuging. During the centrifugal treatment, the temperature is 75-85° C. to obtain a semi-finished product; S3, the semi-finished product is often pressed and steamed, and the mold is removed to obtain the finished concrete pipe pile.

10. The method for preparing C100 autoclave-free machine-made sand concrete pipe pile according to claim 9, characterized in that: The acrylate solution in S2 is prepared by the following method: Acrylate is placed in ethanol at a mass ratio of 1:95-105 and stirred to dissolve to obtain a solution, and then eugenol and glycerol are added and continued to be mixed and stirred evenly. The mass ratio of acrylate, eugenol and glycerol is 1:0.1-0.2:0.1-0.2 to obtain an acrylate solution.