Self-compacting vibration-free concrete and preparation method thereof

Abstract

The invention relates to the technical field of concrete, and particularly discloses self-compacting vibration-free concrete and a preparation method thereof. The self-compacting vibration-free concrete is prepared from the following raw material components in parts by weight: 10 to 20 parts of cement, 40 to 60 parts of fine aggregate, 30 to 50 parts of coarse aggregate, 1 to 10 parts of fly ash, 0.1 to 1 part of water reducing agent, 0.1 to 1 part of thickening agent, 8 to 15 parts of water, 0.1 to 1 part of fiber reinforced material, 0.1 to 1 part of expanding agent, 0.01 to 0.1 part of air entraining agent, 0.1 to 0.5 part of super plasticizer and 0.1 to 0.5 part of water-retaining agent.

Description

Technical Field

[0001] The present application relates to the technical field of concrete, and in particular to a self-compacting vibration-free concrete and a preparation method thereof. Background Art

[0002] As an important building material, concrete is widely used in construction projects. With the continuous development of the construction industry and technological progress, the requirements for concrete performance are getting higher and higher. Traditional ordinary concrete needs to be vibrated by equipment such as vibrating rods during construction to ensure its compactness and strength. However, this process is not only time-consuming and labor-intensive, but may also cause problems such as voids and cracks due to improper operation, affecting the quality of the project. Therefore, the development of high-performance concrete that can be self-compacting and does not require vibration has become a focus of attention in the industry.

[0003] In order to achieve the self-compactness of concrete, the existing technology mainly adopts the following conventional means: first, optimize the mix design and adjust the proportion of cement, aggregate, admixture and other ingredients; second, introduce high-efficiency water reducer and thickener to improve the fluidity and stability of concrete; third, use finer aggregate and coarse aggregate with regular shape to reduce the friction resistance between particles; fourth, control the water consumption to ensure that the concrete has good working performance. Although these measures can improve the self-compactness of concrete to a certain extent, it is still difficult to completely avoid the occurrence of segregation and bleeding in actual applications, which will affect the strength of concrete. Summary of the invention

[0004] In order to improve the strength of concrete, the present application provides a self-compacting vibration-free concrete and a preparation method thereof.

[0005] On the one hand, the present application provides a self-compacting vibration-free concrete, which adopts the following technical solution: A self-compacting vibration-free concrete, wherein the raw materials of the concrete include the following components in parts by weight: 10-20 parts of cement, 40-60 parts of fine aggregate, 30-50 parts of coarse aggregate, 1-10 parts of fly ash, 0.1-1 part of water reducer, 0.1-1 part of thickener, 8-15 parts of water, 0.1-1 part of fiber reinforcement material, 0.1-1 part of expansion agent, 0.01-0.1 part of air entraining agent, 0.1-0.5 part of superplasticizer and 0.1-0.5 part of water retaining agent.

[0006] By adopting the above technical scheme, the superplasticizer, water-retaining agent and water-reducing agent are compounded and used to improve the mechanical and durability properties of concrete. The fiber-reinforced material improves the tensile strength and toughness of concrete, effectively prevents the occurrence of cracks, and enhances the overall stability and durability of the structure. The expansive agent can compensate for the volume shrinkage of concrete during the hardening process, reduce the risk of cracking caused by shrinkage, and improve the durability and overall performance of concrete. The air-entraining agent can effectively introduce tiny bubbles, reduce water seepage, and make the concrete more uniform and stable, thereby improving the strength of the final concrete.

[0007] In a specific embodiment, the water reducing agent includes a mixture of sodium polycarboxylate, anthraquinone sulfonate, sodium lignin sulfonate, sodium citrate and polyvinyl alcohol.

[0008] By adopting the above technical scheme, sodium polycarboxylate, anthraquinone sulfonate, sodium lignin sulfonate and polyvinyl alcohol are used to evenly disperse the components in the water reducer. Sodium citrate can effectively adjust the setting time and hardening speed of concrete, prolong the operable time, and facilitate adjustment and control during the construction process. Sodium polycarboxylate, anthraquinone sulfonate and sodium lignin sulfonate are used in combination to have high water reducing performance.

[0009] In a specific embodiment, the weight ratio of sodium polycarboxylate, anthraquinone sulfonate, sodium lignin sulfonate, sodium citrate and polyvinyl alcohol in the water reducer is 7:(2-4):(1-3):(0.5-1.5):(0.5-1.5).

[0010] By adopting the above technical scheme, the proportion of sodium polycarboxylate, anthraquinone sulfonate, sodium lignin sulfonate, sodium citrate and polyvinyl alcohol in the water reducer is further limited, thereby further improving the water reducing performance of the water reducer.

[0011] In a specific embodiment, the superplasticizer includes a mixture of modified nano-silica, polydimethylsiloxane, and white carbon black.

[0012] By adopting the above technical scheme, modified nano-silica improves the microstructure of concrete and enhances its strength and durability. Polydimethylsiloxane can enhance the durability and crack resistance of concrete. White carbon black improves the strength and durability of concrete and can also cooperate with the water reducer to improve the water reducing property and adaptability of the water reducer, thereby improving the working performance and mechanical properties of concrete.

[0013] In a specific embodiment, the preparation method of the modified nano-silicon dioxide comprises the following steps: γ-aminopropyltriethoxysilane, ethanol and water are stirred and mixed uniformly to obtain a modified solution; The nano-silicon dioxide is stirred, and during the stirring process, a modification liquid is sprayed into the nano-silicon dioxide. After the spraying is completed, the stirring is continued, and the mixture is dried to obtain modified nano-silicon dioxide. The weight ratio of the modification liquid to the nano-silicon dioxide is 1:(13-14).

[0014] By adopting the above technical scheme, nano-silica is modified with γ-aminopropyltriethoxysilane, which not only improves the dispersion performance of nano-silica, but also improves the interface bonding between cement and aggregate, and forms a dense interface layer by filling the pores in concrete, thereby improving the compressive strength and durability of concrete.

[0015] In a specific embodiment, the fine aggregate includes river sand with a particle size of 0.1-2 mm.

[0016] By adopting the above technical solution, using river sand as fine aggregate and controlling the particle size within the range of 0.1-2mm, the fluidity and stability of concrete can be significantly improved. The smaller particle size helps to reduce the gaps between particles and increase the overall density of concrete, thereby avoiding the occurrence of water seepage. At the same time, the selection of this fine aggregate can also effectively improve the working performance of concrete, making it easier to pour and shape.

[0017] In a specific embodiment, the coarse aggregate comprises crushed stone with a particle size of 5-20 mm.

[0018] By adopting the above technical solution and using crushed stone with a particle size range of 5-20 mm as coarse aggregate, the overall strength and durability of concrete can be effectively improved. At the same time, crushed stone in this particle size range can better cooperate with fine aggregate and other components to ensure that the concrete has good fluidity and stability and avoid the occurrence of segregation and bleeding.

[0019] In a specific embodiment, the fiber reinforcement material includes a mixture of polypropylene fibers and steel fibers.

[0020] By adopting the above technical solution, a composite fiber reinforced material composed of polypropylene fiber and steel fiber is used to form a three-dimensional network structure, which effectively disperses stress and enhances the overall strength and ductility of concrete.

[0021] In a specific embodiment, the air entraining agent includes a mixture of sodium rosin acid and saponin powder.

[0022] By adopting the above technical solution and utilizing the composite air entraining agent composed of sodium rosin acid and saponin powder, the strength of concrete can be further improved.

[0023] In both aspects, the present application provides a method for preparing self-compacting vibration-free concrete, which adopts the following technical solution: A method for preparing self-compacting vibration-free concrete comprises the following steps: First, part of the cement, part of the fine aggregate, part of the coarse aggregate and part of the fly ash are stirred and mixed evenly to obtain a mixture A, and then the remaining fine aggregate, the remaining coarse aggregate and part of the water are added and stirred to obtain a mixture B, and then the remaining cement, the remaining fly ash, the water reducer, the thickener, the fiber reinforcement material, the expansion agent, the air entraining agent, the superplasticizer and the water retention agent are added and stirred and mixed evenly, and finally the remaining water is added and stirred and mixed evenly to obtain a self-compacting vibration-free concrete.

[0024] By adopting the above technical scheme, part of cement, part of fine aggregate, part of coarse aggregate and part of fly ash are first mixed, then the remaining fine aggregate, the remaining coarse aggregate and part of water are added and mixed, and then the remaining cement, the remaining fly ash, water reducer, thickener, fiber reinforcement material, expansion agent, air entraining agent, superplasticizer and water retention agent are added and mixed, and finally the remaining water is added and mixed to obtain self-compacting vibration-free concrete with higher strength.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. The superplasticizer, water-retaining agent and water-reducing agent in the present application are compounded and used to improve the mechanical and durability properties of concrete. The fiber-reinforced material improves the tensile strength and toughness of concrete, effectively prevents the generation of cracks, and enhances the overall stability and durability of the structure. The expansion agent can compensate for the volume shrinkage of concrete during the hardening process, reduce the risk of cracking caused by shrinkage, and improve the durability and overall performance of concrete. The air-entraining agent can effectively introduce tiny bubbles, reduce water bleeding, and make the concrete more uniform and stable, thereby improving the strength of the final concrete. 2. The composite fiber-reinforced material composed of polypropylene fiber and steel fiber is used in this application to form a three-dimensional network structure, effectively disperse stress, and enhance the overall strength and ductility of concrete; 3. The method of the present application is to first mix part of cement, part of fine aggregate, part of coarse aggregate and part of fly ash, then add the remaining fine aggregate, the remaining coarse aggregate and part of water and mix, then add the remaining cement, the remaining fly ash, water reducer, thickener, fiber reinforcement, expansion agent, air entraining agent, superplasticizer and water retention agent, mix, and finally add the remaining water and mix to obtain a self-compacting vibration-free concrete with higher strength. DETAILED DESCRIPTION

[0026] The present application is further described in detail below with reference to the embodiments.

[0027] All raw materials in the examples can be obtained from commercial sources. The expansion agent is calcium oxide expansion agent, model number CAL.

[0028] Preparation Example Preparation Example 1 Preparation Example 1 provides a method for preparing modified nano-silicon dioxide, comprising the following steps: γ-aminopropyltriethoxysilane, ethanol and water are stirred and mixed uniformly to obtain a modified liquid; wherein the weight ratio of γ-aminopropyltriethoxysilane, ethanol and water is 5:18:2; The nano-silica was stirred, and during the stirring process, the modified liquid was slowly sprayed into the nano-silica. After the spraying was completed, the stirring was continued for 0.5 h, and then dried at 80° C. for 0.5 h to obtain modified nano-silica; wherein the weight ratio of the modified liquid to the nano-silica was 1:12.5.

[0029] Preparation Example 2 Preparation Example 2 provides a method for preparing modified nano-silicon dioxide, comprising the following steps: γ-aminopropyltriethoxysilane, ethanol and water are stirred and mixed uniformly to obtain a modified liquid; wherein the weight ratio of γ-aminopropyltriethoxysilane, ethanol and water is 5:18:2; The nano-silica was stirred, and during the stirring process, the modified liquid was slowly sprayed into the nano-silica. After the spraying was completed, the stirring was continued for 0.5 h, and then dried at 80° C. for 0.5 h to obtain modified nano-silica; wherein the weight ratio of the modified liquid to the nano-silica was 1:13.

[0030] Preparation Example 3 Preparation Example 3 provides a method for preparing modified nano-silicon dioxide, comprising the following steps: γ-aminopropyltriethoxysilane, ethanol and water are stirred and mixed uniformly to obtain a modified liquid; wherein the weight ratio of γ-aminopropyltriethoxysilane, ethanol and water is 5:18:2; The nano-silica was stirred, and during the stirring process, the modified liquid was slowly sprayed into the nano-silica. After the spraying was completed, the stirring was continued for 0.5 h, and then dried at 80° C. for 0.5 h to obtain modified nano-silica; wherein the weight ratio of the modified liquid to the nano-silica was 1:13.5.

[0031] Preparation Example 4 Preparation Example 4 provides a method for preparing modified nano-silicon dioxide, comprising the following steps: γ-aminopropyltriethoxysilane, ethanol and water are stirred and mixed uniformly to obtain a modified liquid; wherein the weight ratio of γ-aminopropyltriethoxysilane, ethanol and water is 5:18:2; The nano-silica was stirred, and during the stirring process, the modified liquid was slowly sprayed into the nano-silica. After the spraying was completed, the stirring was continued for 0.5 h, and then dried at 80° C. for 0.5 h to obtain modified nano-silica; wherein the weight ratio of the modified liquid to the nano-silica was 1:14.

[0032] Preparation Example 5 Preparation Example 5 provides a method for preparing modified nano-silicon dioxide, comprising the following steps: γ-aminopropyltriethoxysilane, ethanol and water are stirred and mixed uniformly to obtain a modified liquid; wherein the weight ratio of γ-aminopropyltriethoxysilane, ethanol and water is 5:18:2; The nano-silica was stirred, and during the stirring process, the modified liquid was slowly sprayed into the nano-silica. After the spraying was completed, the stirring was continued for 0.5 h, and then dried at 80° C. for 0.5 h to obtain modified nano-silica; wherein the weight ratio of the modified liquid to the nano-silica was 1:14.5. Example

[0033] Example 1 Embodiment 1 provides a method for preparing self-compacting vibration-free concrete, comprising the following steps: First, 50kg of cement, 200kg of fine aggregate, 150kg of coarse aggregate and 5kg of fly ash are stirred and mixed evenly to obtain mixture A, then 200kg of fine aggregate, 150kg of coarse aggregate and 56kg of water are added and stirred to obtain mixture B, then 50kg of cement, 5kg of fly ash, 1kg of water reducer, 1kg of thickener, 1kg of fiber reinforcement material, 1kg of expansion agent, 0.1kg of air entraining agent, 1kg of superplasticizer and 1kg of water retaining agent are added and stirred and mixed evenly, and finally 24kg of water is added and stirred and mixed evenly to obtain self-compacting vibration-free concrete; wherein the fine aggregate is river sand with a particle size of 0.1-2mm; the coarse aggregate is crushed stone with a particle size of 5-20mm; the water reducer is sodium salt of polycarboxylate, anthraquinone sulfonate, wood The invention discloses a mixture of sodium lignin sulfonate, sodium citrate and polyvinyl alcohol, and the weight ratio of sodium polycarboxylate, anthraquinone sulfonate, sodium lignin sulfonate, sodium citrate and polyvinyl alcohol is 7:2:1:0.5:0.5; the thickener is hydroxyethyl cellulose; the fiber reinforcement material is a mixture of polypropylene fiber and steel fiber, and the weight ratio of polypropylene fiber to steel fiber is 5:1; the expander is calcium oxide expander; the air entraining agent is a mixture of sodium rosin acid and saponin powder, and the weight ratio of sodium rosin acid and saponin powder is 1:1; the superplasticizer is a mixture of modified nano-silica, polydimethylsiloxane and white carbon black in Preparation Example 1, and the weight ratio of modified nano-silica, polydimethylsiloxane and white carbon black is 3:1:1; the water retaining agent is SAP water retaining agent.

[0034] Example 2 The difference between Example 2 and Example 1 is that 75kg of cement, 250kg of fine aggregate, 200kg of coarse aggregate, and 25kg of fly ash are first stirred and mixed evenly to obtain a mixture A, and then 250kg of fine aggregate, 200kg of coarse aggregate and 80kg of water are added and stirred to obtain a mixture B, and then 75kg of cement, 25kg of fly ash, 5kg of water reducer, 5kg of thickener, 5kg of fiber reinforcement material, 5kg of expansion agent, 0.5kg of air entraining agent, 3kg of superplasticizer, and 3kg of water retention agent are added and stirred and mixed evenly, and finally 35kg of water is added and stirred and mixed evenly to obtain a self-compacting vibration-free concrete; the remaining steps are consistent with Example 1.

[0035] Example 3 The difference between Example 3 and Example 1 is that 100 kg of cement, 300 kg of fine aggregate, 250 kg of coarse aggregate, and 50 kg of fly ash are first stirred and mixed evenly to obtain a mixture A, then 300 kg of fine aggregate, 250 kg of coarse aggregate and 105 kg of water are added and stirred to obtain a mixture B, and then 100 kg of cement, 50 kg of fly ash, 10 kg of water reducer, 10 kg of thickener, 10 kg of fiber reinforcement material, 10 kg of expansion agent, 1 kg of air entraining agent, 5 kg of superplasticizer, and 5 kg of water retention agent are added and stirred and mixed evenly, and finally 45 kg of water is added and stirred and mixed evenly to obtain a self-compacting vibration-free concrete; the remaining steps are consistent with Example 1.

[0036] Example 4 The difference between Example 4 and Example 2 is that the weight ratio of sodium polycarboxylate, anthraquinone sulfonate, sodium lignin sulfonate, sodium citrate and polyvinyl alcohol in the water reducer is 7:3:2:1:1; the remaining steps are consistent with Example 2.

[0037] Example 5 The difference between Example 5 and Example 2 is that the weight ratio of sodium polycarboxylate, anthraquinone sulfonate, sodium lignin sulfonate, sodium citrate and polyvinyl alcohol in the water reducer is 7:4:3:1.5:1.5; the remaining steps are consistent with Example 2.

[0038] Example 6 The difference between Example 6 and Example 4 is that the water reducer is a mixture of sodium polycarboxylate, anthraquinone sulfonate and sodium lignin sulfonate, and the weight ratio of sodium polycarboxylate, anthraquinone sulfonate and sodium lignin sulfonate is 7:3:2; the remaining steps are consistent with Example 4.

[0039] Example 7 The difference between Example 7 and Example 4 is that the superplasticizer is polydimethylsiloxane; the remaining steps are consistent with Example 4.

[0040] Example 8 The difference between Example 8 and Example 4 is that the superplasticizer is a mixture of modified nano-silica, polydimethylsiloxane and white carbon black in Preparation Example 2; and the remaining steps are consistent with Example 4.

[0041] Example 9 The difference between Example 9 and Example 4 is that the superplasticizer is a mixture of modified nano-silica, polydimethylsiloxane and white carbon black in Preparation Example 3; the remaining steps are consistent with Example 4.

[0042] Example 10 The difference between Example 10 and Example 4 is that the superplasticizer is a mixture of modified nano-silica, polydimethylsiloxane and white carbon black in Preparation Example 4; the remaining steps are consistent with Example 4.

[0043] Embodiment 11 The difference between Example 11 and Example 4 is that the superplasticizer is a mixture of modified nano-silica, polydimethylsiloxane and white carbon black in Preparation Example 5; the remaining steps are consistent with Example 4.

[0044] Example 12 The difference between Example 12 and Example 9 is that the fiber reinforcement material is polypropylene fiber; the remaining steps are consistent with Example 9.

[0045] Embodiment 13 The difference between Example 13 and Example 9 is that the fiber reinforcement material is steel fiber; the remaining steps are consistent with Example 9.

[0046] Embodiment 14 The difference between Example 14 and Example 9 is that the air entraining agent is sodium rosin acid; the remaining steps are consistent with Example 9.

[0047] Embodiment 15 The difference between Example 15 and Example 9 is that the air entraining agent includes saponin powder; the remaining steps are consistent with Example 9.

[0048] Comparative Example Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that 53.1 kg of cement, 200 kg of fine aggregate, 150 kg of coarse aggregate and 5 kg of fly ash are first stirred and mixed evenly to obtain a mixture A, then 200 kg of fine aggregate, 150 kg of coarse aggregate and 56 kg of water are added and stirred to obtain a mixture B, and then 50 kg of cement, 5 kg of fly ash, 1 kg of water reducer, 1 kg of thickener and 1 kg of water retaining agent are added and stirred evenly, and finally 24 kg of water is added and stirred evenly to obtain a self-compacting vibration-free concrete; the remaining steps are consistent with Example 1.

[0049] Comparative Example 2 The difference between Comparative Example 2 and Example 1 is that 52.1 kg of cement, 200 kg of fine aggregate, 150 kg of coarse aggregate, and 5 kg of fly ash are first stirred and mixed evenly to obtain a mixture A, and then 200 kg of fine aggregate, 150 kg of coarse aggregate and 56 kg of water are added to obtain a mixture B, and then 50 kg of cement, 5 kg of fly ash, 1 kg of water reducer, 1 kg of thickener, 1 kg of superplasticizer, and 1 kg of water retaining agent are added and stirred evenly, and finally 24 kg of water is added and stirred evenly to obtain a self-compacting vibration-free concrete; the remaining steps are consistent with Example 1.

[0050] Comparative Example 3 The difference between Comparative Example 3 and Example 1 is that 52.1 kg of cement, 200 kg of fine aggregate, 150 kg of coarse aggregate and 5 kg of fly ash are first stirred and mixed evenly to obtain a mixture A, then 200 kg of fine aggregate, 150 kg of coarse aggregate and 56 kg of water are added and stirred to obtain a mixture B, and then 50 kg of cement, 5 kg of fly ash, 1 kg of water reducer, 1 kg of thickener, 1 kg of fiber reinforcement material and 1 kg of water retaining agent are added and stirred evenly, and finally 24 kg of water is added and stirred evenly to obtain a self-compacting vibration-free concrete; the remaining steps are consistent with Example 1.

[0051] Performance test strength: The concrete in each embodiment and comparative example was constructed without vibration, and the expansion degree was measured for 2 hours, and then the compressive strength of the concrete was measured for 28 days.

[0052] Table 1 Concrete performance test results sample Expansion(cm) 28-day compressive strength (MPa) Example 1 63.5 45.5 Example 2 65.2 48.2 Example 3 64.3 46.9 Example 4 66.7 49.9 Example 5 65.8 49.3 Example 6 65.2 49.1 Example 7 65.5 48.9 Example 8 67.9 51.3 Example 9 68.3 51.5 Example 10 68.0 51.5 Embodiment 11 67.0 50.3 Example 12 68.1 50.2 Embodiment 13 68.2 50.0 Embodiment 14 68.0 50.5 Embodiment 15 68.1 46.3 Comparative Example 1 61.0 35.2 Comparative Example 2 62.2 37.9 Comparative Example 3 62.3 38.1 Combining Example 1 and Comparative Examples 1-3, the strength of the concrete in Example 1 is the highest. It can be seen that when preparing concrete, fiber reinforcement materials, expansion agents, air entraining agents, and superplasticizers are added, and superplasticizers, water retaining agents, and water reducing agents are compounded for use, which can improve the mechanical and durability properties of concrete. The fiber reinforcement materials improve the tensile strength and toughness of the concrete, effectively prevent the generation of cracks, and enhance the overall stability and durability of the structure. The expansion agent can compensate for the volume shrinkage of the concrete during the hardening process, reduce the risk of cracking caused by shrinkage, and improve the durability and overall performance of the concrete. The air entraining agent can effectively introduce tiny bubbles, reduce water bleeding, and make the concrete more uniform and stable, thereby improving the strength of the final concrete.

[0053] In combination with Examples 1-3, the strength of the concrete in Example 2 is the highest. It can be seen that when preparing concrete, increasing the amount of raw materials used will result in the performance of the concrete showing a trend of first increasing and then decreasing.

[0054] Combining Example 2, Example 4 and Example 5, the strength of the concrete in Example 4 is the highest. It can be seen that the ratio of sodium polycarboxylate, anthraquinone sulfonate, sodium lignin sulfonate, sodium citrate and polyvinyl alcohol in the water reducer in Example 4 is optimal, so that the concrete obtained has the highest strength.

[0055] Combining Example 4 and Example 6, the strength of the concrete in Example 4 is higher. It can be seen that when the water reducer is added, the water reducer is preferably a mixture of sodium polycarboxylate, anthraquinone sulfonate, sodium lignin sulfonate, sodium citrate, and polyvinyl alcohol, and the strength of the obtained concrete is higher.

[0056] Combining Example 4 and Example 7, the strength of the concrete in Example 4 is higher. It can be seen that when the superplasticizer is added, the superplasticizer is preferably a mixture of modified nano-silica, polydimethylsiloxane, and white carbon black, and the strength of the obtained concrete is higher.

[0057] Combining Example 4 with Examples 8-11, the strength of the concrete in Examples 8-10 is relatively high. It can be seen that when preparing modified nano-silica, the ratio of the modifying liquid to the nano-silica is preferably 1:(13-14), which has a better modification effect on the nano-silica.

[0058] Combining Example 9, Example 12 and Example 13, the strength of the concrete in Example 9 is the highest. It can be seen that when the fiber reinforcement material is added, the fiber reinforcement material is preferably a composite material composed of polypropylene fiber and steel fiber, which can form a three-dimensional network structure, effectively disperse the stress, and enhance the overall strength of the concrete.

[0059] Combining Example 9, Example 14 and Example 15, the strength of the concrete in Example 9 is the highest. It can be seen that when the air entraining agent is added, the air entraining agent is preferably a mixture of sodium rosin acid and saponin powder, which can further enhance the strength of the concrete.

[0060] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed. However, as long as it is within the scope of the claims of the present application, it shall be protected by the patent law.

Claims

1. A self-compacting vibration-free concrete, characterized in that: The raw materials of the concrete include the following components in parts by weight: 10-20 parts of cement, 40-60 parts of fine aggregate, 30-50 parts of coarse aggregate, 1-10 parts of fly ash, 0.1-1 parts of water reducer, 0.1-1 parts of thickener, 8-15 parts of water, 0.1-1 parts of fiber reinforcement material, 0.1-1 parts of expansion agent, 0.01-0.1 parts of air entraining agent, 0.1-0.5 parts of superplasticizer and 0.1-0.5 parts of water retaining agent.

2. The self-compacting vibration-free concrete according to claim 1, characterized in that: The water reducing agent comprises a mixture of sodium polycarboxylate, anthraquinone sulfonate, sodium lignin sulfonate, sodium citrate and polyvinyl alcohol.

3. The self-compacting vibration-free concrete according to claim 2, characterized in that: The weight ratio of sodium polycarboxylate, anthraquinone sulfonate, sodium lignin sulfonate, sodium citrate and polyvinyl alcohol in the water reducer is 7: (2-4): (1-3): (0.5-1.5): (0.5-1.5).

4. The self-compacting vibration-free concrete according to claim 1, characterized in that: The superplasticizer comprises a mixture of modified nano silicon dioxide, polydimethylsiloxane and white carbon black.

5. The self-compacting vibration-free concrete according to claim 4, characterized in that: The preparation method of the modified nano silicon dioxide comprises the following steps: γ-aminopropyltriethoxysilane, ethanol and water are stirred and mixed uniformly to obtain a modified solution; The nano-silicon dioxide is stirred, and during the stirring process, a modification liquid is sprayed into the nano-silicon dioxide. After the spraying is completed, the stirring is continued, and the mixture is dried to obtain modified nano-silicon dioxide. The weight ratio of the modification liquid to the nano-silicon dioxide is 1:(13-14).

6. The self-compacting vibration-free concrete according to claim 1, characterized in that: The fine aggregate includes river sand with a particle size of 0.1-2 mm.

7. The self-compacting vibration-free concrete according to claim 1, characterized in that: The coarse aggregate includes crushed stone with a particle size of 5-20 mm.

8. The self-compacting vibration-free concrete according to claim 1, characterized in that: The fiber reinforcement material comprises a mixture of polypropylene fibers and steel fibers.

9. The self-compacting vibration-free concrete according to claim 1, characterized in that: The air entraining agent comprises a mixture of sodium rosin acid and saponin powder.

10. A method for preparing the self-compacting vibration-free concrete according to any one of claims 1 to 9, characterized in that: The following steps are involved: First, part of the cement, part of the fine aggregate, part of the coarse aggregate and part of the fly ash are stirred and mixed evenly to obtain a mixture A, and then the remaining fine aggregate, the remaining coarse aggregate and part of the water are added and stirred to obtain a mixture B, and then the remaining cement, the remaining fly ash, the water reducer, the thickener, the fiber reinforcement material, the expansion agent, the air entraining agent, the superplasticizer and the water retention agent are added and stirred and mixed evenly, and finally the remaining water is added and stirred and mixed evenly to obtain a self-compacting vibration-free concrete.