CN112456959A - Flexible reinforced fiber concrete and preparation method thereof - Google Patents
Flexible reinforced fiber concrete and preparation method thereof Download PDFInfo
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- CN112456959A CN112456959A CN202011551767.5A CN202011551767A CN112456959A CN 112456959 A CN112456959 A CN 112456959A CN 202011551767 A CN202011551767 A CN 202011551767A CN 112456959 A CN112456959 A CN 112456959A
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/34—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders
- C04B28/344—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing cold phosphate binders the phosphate binder being present in the starting composition solely as one or more phosphates
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention discloses a flexible reinforced fiber concrete which is prepared from the following raw materials in parts by weight: 130 parts of ordinary portland cement 110-containing materials, 10-15 parts of high-iron phosphoaluminate cement, 25-30 parts of modified waste rubber particles, 5-10 parts of polyolefin elastomer, 3-6 parts of flotation deinking slag fiber, 3-5 parts of modified sepiolite fiber, 10-20 parts of silicon carbide powder, 5-10 parts of bamboo fiber powder, 10-15 parts of polycarboxylic acid water reducing agent, 3-5 parts of magnesium fluosilicate, 10-15 parts of slag powder, 3-7 parts of fly ash, 170 parts of sand 160-containing materials, 480 parts of stone 460-containing materials and 50-60 parts of water. The invention also discloses a preparation method of the flexible reinforced fiber concrete. The flexible reinforced fiber concrete has the characteristics of good deformation capacity, high toughness, high strength and good bonding performance, and the expansion stress of the concrete is absorbed by utilizing the elastic characteristics of the modified waste rubber particles and the polyolefin elastomer, so that the overall volume stability of the concrete is good, and the flexible reinforced fiber concrete is matched with other materials to obviously improve the overall flexibility of the concrete.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to flexible reinforced fiber concrete and a preparation method thereof.
Background
The economic development can not leave the road construction, the road construction is firstly repaired if the economy is rich, the importance of the road construction to the economic construction of China can be seen, but the road traffic is inevitably increased by the economic development, and the road traffic and the economic construction have a push-pull relationship. From the road use condition of China at present, besides large traffic volume, long-term heavy load and overload become the use characteristics of the current road. The cement concrete is an artificial stone material prepared from cement cementing materials, granular aggregates (also called as aggregates) and water according to a certain proportion through uniform stirring, dense forming, curing and hardening. As a pavement material, the cement concrete has the advantages of simple construction, high pavement strength, good stability, good durability, simple and convenient maintenance and the like. However, if the cement concrete pavement is designed, constructed and maintained according to the traditional road method, the cement concrete pavement is damaged to different degrees before the designed service life, and the characteristics of high rigidity and insufficient deformability of the cement concrete gradually appear, especially the problem of concrete cracks is more prominent.
Meanwhile, with the rapid development of the automobile industry, the production and accumulation of a large amount of waste rubber tires has constituted a serious "black pollution". The waste rubber material is processed and doped into the concrete, so that the problem of environmental pollution caused by the waste rubber can be solved, the characteristic of elasticity of the rubber material can be well utilized, and the concrete with good flexibility can be prepared. In the prior art, waste rubber materials are added into concrete, so that a large amount of waste can be utilized, the natural environment is improved, the elasticity of the concrete prepared by using the waste rubber materials is higher than that of common concrete, but the flexibility of the concrete prepared by using the method is limited, the rubber particles are not well compatible with inorganic materials such as cement, the caking property is low, and the strength, the impermeability and the compactness of the concrete are influenced.
Disclosure of Invention
The invention provides flexible reinforced fiber concrete with good deformability, high toughness, high strength and good bonding property, and solves the problems of large rigidity and insufficient deformability of concrete in the prior art.
The invention also provides a preparation method of the improved flexible reinforced fiber concrete.
The purpose of the invention is realized by the following technical scheme:
the flexible reinforced fiber concrete is prepared from the following raw materials in parts by weight: 130 parts of ordinary portland cement 110-containing materials, 10-15 parts of high-iron phosphoaluminate cement, 25-30 parts of modified waste rubber particles, 5-10 parts of polyolefin elastomer, 3-6 parts of flotation deinking slag fiber, 3-5 parts of modified sepiolite fiber, 10-20 parts of silicon carbide powder, 5-10 parts of bamboo fiber powder, 10-15 parts of polycarboxylic acid water reducing agent, 3-5 parts of magnesium fluosilicate, 10-15 parts of slag powder, 3-7 parts of fly ash, 170 parts of sand 160-containing materials, 480 parts of stone 460-containing materials and 50-60 parts of water.
The modified waste rubber particles are prepared by the following steps:
1) making waste tire into waste rubber particles with the particle size of 30-50 meshes;
2) placing the waste rubber particles in ethyl orthosilicate, standing at room temperature for 8-12h, and filtering to obtain semi-swelling colloidal particles;
3) and (3) mixing the semi-swollen colloidal particles and oleic acid according to the ratio of 1: 1, stirring the mixture at 1000r/min until the mixture is dispersed, and filtering the mixture to obtain swelling colloidal particles;
4) and adding the swelling colloidal particles into a NaOH solution with the concentration of 3mol/L, stirring for 5-10min, filtering, and drying to obtain the modified waste rubber particles.
The size of the flotation deinking residue fiber does not exceed 200 meshes.
The modified sepiolite fiber is prepared by the following method: adding sepiolite fibers into a NaOH solution with the concentration of 2.5mol/L to soak for 2 hours, washing for 2 times, adding an HCl solution with the concentration of 2.9mol/L to soak for 3 hours, washing for 3 times, and drying to obtain a primary material; and adding methyl triethoxysilane and epoxidized triglyceride into the primary material, mixing and stirring for 15min at the speed of 1000r/min, drying and crushing to obtain the modified sepiolite fiber.
The weight ratio of the primary material, the methyltriethoxysilane and the epoxidized triglyceride is 100: 3: 1.5.
the polyolefin elastomer is an ethylene-octene copolymer; the SiC content of the silicon carbide powder is more than 96.5 percent; the specific surface area of the slag powder is more than 350cm2/g, density is more than or equal to 2.8gcm3。
The particle size of the bamboo fiber powder is 140-160 meshes.
A preparation method of flexible reinforced fiber concrete is prepared by the following steps:
1) uniformly mixing ordinary portland cement, high-iron phosphoaluminate cement, slag powder, fly ash, sand and stones to obtain a material A;
2) uniformly mixing modified waste rubber particles, a polyolefin elastomer, silicon carbide powder, bamboo fiber powder, a polycarboxylic acid water reducing agent and magnesium fluosilicate to obtain a material B;
3) mixing and stirring one third of the material A and the material B for 3-5min to obtain a material C;
4) adding the material C into the rest material A, mixing and stirring for 30-60s to obtain a material D;
5) and adding water into the material D, stirring for 2-4min, adding the flotation deinking residue fiber and the modified sepiolite fiber into the material D, and stirring for 3-5min to obtain the flexible reinforced fiber concrete.
Because the ordinary portland cement is slow in early hydration and low in strength, the invention combines the low-alkalinity, early-strength and quick-hardening high-iron phosphoaluminate cement with the ordinary portland cement, obviously improves the compactness of the concrete, further improves the strength of the concrete, and achieves the technical effects of good volume stability and high strength. Furthermore, the high-iron phosphoaluminate cement and the ordinary portland cement are matched, so that the reinforcing effect of the flotation deinking slag fiber and the modified sepiolite fiber can be exerted for a long time, and the strength of the concrete is improved. According to the invention, the waste rubber particles are subjected to half swelling and swelling through the tetraethoxysilane, so that the density of the waste rubber particles is remarkably reduced, and the surface hardness of the waste rubber particles is softened; and the compatibility is improved by modifying through NaOH solution, the prepared modified waste rubber particles have good binding force with other components, the densification of a concrete system is obviously improved, the body deformation capacity of the modified waste rubber particles can be fully exerted to improve the toughness of the concrete, the elastic modulus is reduced, and further the occurrence of concrete cracks is reduced. The polyolefin elastomer can be uniformly dispersed in cement mortar to form a uniform integral structure filled with each other, and the polyolefin elastomer can be effectively realizedThe binding force of the components and the densification of the system fully play the deformation capacity of the polyolefin elastomer to improve the toughness of the concrete system, thereby improving the flexibility and the strength of the concrete. By modification, the connection performance of the sepiolite fibers and the cement mortar is enhanced. The flotation deinking residue fiber and the modified sepiolite fiber can effectively reduce the stress concentration degree of the crack tip, play a role in toughening and crack resistance, and enable the concrete to have higher flexibility and deformability. The silicon carbide powder and the bamboo fiber powder are distributed between cement hydrate and aggregate and between cement hydrate and fiber, and are filled in micropores of other materials to form a mutually crossed space network structure, so that the compactness of the cementing material is improved, and the flexibility of concrete is improved. The polycarboxylic acid water reducing agent can reduce harmful excess water in concrete and reduce porosity. The magnesium fluosilicate permeates into the concrete through micropores in the concrete and then reacts with a hydration product calcium hydroxide in the concrete to generate gel with a cross-linked structure and calcium fluoride precipitate, so that the surface of the concrete becomes dense and the strength of the concrete is improved. The slag powder can be hydrated with C4AF phase product Ca (OH)2More C-S-H gel is generated by reaction, and the compactness of the concrete product is improved. The fly ash can reduce the hydration heat and thermal expansion of cement, reduce cracking caused by self-contraction and improve the compactness of concrete.
The invention has the beneficial effects that:
1. the flexible reinforced fiber concrete has the characteristics of good deformation capacity, high toughness, high strength and good bonding performance, and the expansion stress of the concrete is absorbed by utilizing the elastic characteristics of the modified waste rubber particles and the polyolefin elastomer, so that the overall volume stability of the concrete is good, and the flexible reinforced fiber concrete is matched with other materials to obviously improve the overall flexibility of the concrete.
2. At present, waste tires are mostly stored in a stacking mode or are treated and utilized in road filling mode, limited space is occupied, and meanwhile great environmental pollution is caused. The invention changes waste into valuable, fully recycles waste resources, realizes the rationalization of resources, promotes the development of green resources, and promotes energy conservation, emission reduction and comprehensive utilization.
3. The preparation method is simple, and the prepared flexible reinforced fiber concrete can be applied to different types of pavements such as newly-built pavements, old roads with auxiliary roads, bridge decks, tunnels and the like, and has extremely high popularization value.
Detailed Description
The following is a detailed description of embodiments of the invention, but the invention can be implemented in many different ways, as defined and covered by the claims. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The fly ash used in the invention is first-grade fly ash.
The sand used in the invention is river sand, and the fineness modulus is 2.4; the stones are 5-25mm continuous graded broken stones.
Example 1
The flexible reinforced fiber concrete is prepared from the following raw materials in parts by weight: 120 parts of ordinary portland cement, 13 parts of high-iron phosphoaluminate cement, 28 parts of modified waste rubber particles, 7 parts of polyolefin elastomer, 5 parts of flotation deinking slag fiber, 4 parts of modified sepiolite fiber, 15 parts of silicon carbide powder, 7 parts of bamboo fiber powder, 13 parts of polycarboxylic acid water reducing agent, 4 parts of magnesium fluosilicate, 12 parts of slag powder, 5 parts of fly ash, 165 parts of sand, 470 parts of pebble and 55 parts of water.
The modified waste rubber particles are prepared by the following steps:
1) making waste tire into waste rubber particles with the particle size of 30-50 meshes;
2) placing the waste rubber particles in ethyl orthosilicate, standing at room temperature for 10h, and filtering to obtain semi-swelling colloidal particles;
3) and (2) mixing the semi-swelling colloidal particles and oleic acid according to the ratio of 1: 1, stirring the mixture at 1000r/min until the mixture is dispersed, and filtering the mixture to obtain swelling colloidal particles;
4) and adding the swelling colloidal particles into a NaOH solution with the concentration of 3mol/L, stirring for 8min, filtering, and drying to obtain the modified waste rubber particles.
The size of the flotation deinking residue fiber does not exceed 200 meshes.
The modified sepiolite fiber is prepared by the following method: adding sepiolite fibers into a NaOH solution with the concentration of 2.5mol/L to soak for 2 hours, washing for 2 times, adding an HCl solution with the concentration of 2.9mol/L to soak for 3 hours, washing for 3 times, and drying to obtain a primary material; and adding methyl triethoxysilane and epoxidized triglyceride into the primary material, mixing and stirring for 15min at the speed of 1000r/min, drying and crushing to obtain the modified sepiolite fiber.
The weight ratio of the primary material, the methyltriethoxysilane and the epoxidized triglyceride is 100: 3: 1.5.
the polyolefin elastomer is an ethylene-octene copolymer; the SiC content of the silicon carbide powder is more than 96.5 percent; the specific surface area of the slag powder is more than 350cm2G, density is more than or equal to 2.8g/cm3。
The particle size of the bamboo fiber powder is 140-160 meshes.
A preparation method of flexible reinforced fiber concrete is prepared by the following steps:
1) uniformly mixing ordinary portland cement, high-iron phosphoaluminate cement, slag powder, fly ash, sand and stones to obtain a material A;
2) uniformly mixing modified waste rubber particles, a polyolefin elastomer, silicon carbide powder, bamboo fiber powder, a polycarboxylic acid water reducing agent and magnesium fluosilicate to obtain a material B;
3) mixing and stirring one third of the material A and the material B for 5min to obtain a material C;
4) adding the material C into the rest material A, and mixing and stirring for 45s to obtain a material D;
5) and adding water into the material D, stirring for 3min, adding the flotation deinking residue fiber and the modified sepiolite fiber into the material D, and stirring for 4min to obtain the flexible reinforced fiber concrete.
Example 2
The flexible reinforced fiber concrete is prepared from the following raw materials in parts by weight: 110 parts of ordinary portland cement, 15 parts of high-iron phosphoaluminate cement, 25 parts of modified waste rubber particles, 10 parts of polyolefin elastomer, 3 parts of flotation deinking slag fiber, 5 parts of modified sepiolite fiber, 10 parts of silicon carbide powder, 5 parts of bamboo fiber powder, 15 parts of polycarboxylic acid water reducing agent, 5 parts of magnesium fluosilicate, 10 parts of slag powder, 7 parts of fly ash, 170 parts of sand, 460 parts of stones and 60 parts of water.
The modified waste rubber particles are prepared by the following steps:
1) making waste tire into waste rubber particles with the particle size of 30-50 meshes;
2) placing the waste rubber particles in ethyl orthosilicate, standing at room temperature for 8 hours, and filtering to obtain semi-swelling colloidal particles;
3) and (3) mixing the semi-swollen colloidal particles and oleic acid according to the ratio of 1: 1, stirring the mixture at 1000r/min until the mixture is dispersed, and filtering the mixture to obtain swelling colloidal particles;
4) and adding the swelling colloidal particles into a NaOH solution with the concentration of 3mol/L, stirring for 10min, filtering, and drying to obtain the modified waste rubber particles.
A preparation method of flexible reinforced fiber concrete is prepared by the following steps:
1) uniformly mixing ordinary portland cement, high-iron phosphoaluminate cement, slag powder, fly ash, sand and stones to obtain a material A;
2) uniformly mixing modified waste rubber particles, a polyolefin elastomer, silicon carbide powder, bamboo fiber powder, a polycarboxylic acid water reducing agent and magnesium fluosilicate to obtain a material B;
3) mixing and stirring one third of the material A and the material B for 3min to obtain a material C;
4) adding the material C into the rest material A, and mixing and stirring for 60s to obtain a material D;
5) and adding water into the material D, stirring for 2min, adding the flotation deinking residue fiber and the modified sepiolite fiber into the material D, and stirring for 5min to obtain the flexible reinforced fiber concrete.
The rest is the same as example 1.
Example 3
The flexible reinforced fiber concrete is prepared from the following raw materials in parts by weight: 130 parts of ordinary portland cement, 10 parts of high-iron phosphoaluminate cement, 30 parts of modified waste rubber particles, 5 parts of polyolefin elastomer, 6 parts of flotation deinking slag fiber, 3 parts of modified sepiolite fiber, 20 parts of silicon carbide powder, 10 parts of bamboo fiber powder, 10 parts of polycarboxylic acid water reducing agent, 3 parts of magnesium fluosilicate, 15 parts of slag powder, 3 parts of fly ash, 160 parts of sand, 480 parts of stones and 50 parts of water.
The modified waste rubber particles are prepared by the following steps:
1) making waste tire into waste rubber particles with the particle size of 30-50 meshes;
2) placing the waste rubber particles in ethyl orthosilicate, standing at room temperature for 12h, and filtering to obtain semi-swelling colloidal particles;
3) and (3) mixing the semi-swollen colloidal particles and oleic acid according to the ratio of 1: 1, stirring the mixture at 1000r/min until the mixture is dispersed, and filtering the mixture to obtain swelling colloidal particles;
4) and adding the swelling colloidal particles into a NaOH solution with the concentration of 3mol/L, stirring for 5min, filtering, and drying to obtain the modified waste rubber particles.
A preparation method of flexible reinforced fiber concrete is prepared by the following steps:
1) uniformly mixing ordinary portland cement, high-iron phosphoaluminate cement, slag powder, fly ash, sand and stones to obtain a material A;
2) uniformly mixing modified waste rubber particles, a polyolefin elastomer, silicon carbide powder, bamboo fiber powder, a polycarboxylic acid water reducing agent and magnesium fluosilicate to obtain a material B;
3) mixing and stirring one third of the material A and the material B for 5min to obtain a material C;
4) adding the material C into the rest material A, mixing and stirring for 30s to obtain a material D;
5) and adding water into the material D, stirring for 4min, adding the flotation deinking residue fiber and the modified sepiolite fiber into the material D, and stirring for 3min to obtain the flexible reinforced fiber concrete.
The rest is the same as example 1.
Comparative example 1
The flexible reinforced fiber concrete is prepared from the following raw materials in parts by weight: 133 parts of ordinary portland cement, 28 parts of modified waste rubber particles, 7 parts of polyolefin elastomer, 5 parts of flotation deinking slag fiber, 4 parts of modified sepiolite fiber, 15 parts of silicon carbide powder, 7 parts of bamboo fiber powder, 13 parts of polycarboxylic acid water reducing agent, 4 parts of magnesium fluosilicate, 12 parts of slag powder, 5 parts of fly ash, 165 parts of sand, 470 parts of pebble and 55 parts of water.
The rest is the same as example 1.
Comparative example 2
The flexible reinforced fiber concrete is prepared from the following raw materials in parts by weight: 120 parts of ordinary portland cement, 13 parts of high-iron phosphoaluminate cement, 28 parts of waste rubber particles, 7 parts of polyolefin elastomer, 5 parts of flotation deinking slag fiber, 4 parts of modified sepiolite fiber, 15 parts of silicon carbide powder, 7 parts of bamboo fiber powder, 13 parts of polycarboxylic acid water reducing agent, 4 parts of magnesium fluosilicate, 12 parts of slag powder, 5 parts of fly ash, 165 parts of sand, 470 parts of pebble and 55 parts of water.
The waste rubber particles are prepared from waste tires, and the particle size is 30-50 meshes.
The rest is the same as example 1.
Comparative example 3
The flexible reinforced fiber concrete is prepared from the following raw materials in parts by weight: 120 parts of ordinary portland cement, 13 parts of high-iron phosphoaluminate cement, 35 parts of modified waste rubber particles, 5 parts of flotation deinking slag fibers, 4 parts of modified sepiolite fibers, 15 parts of silicon carbide powder, 7 parts of bamboo fiber powder, 13 parts of polycarboxylic acid water reducing agent, 4 parts of magnesium fluosilicate, 12 parts of slag powder, 5 parts of fly ash, 165 parts of sand, 470 parts of stones and 55 parts of water.
The rest is the same as example 1.
Comparative example 4
The flexible reinforced fiber concrete is prepared from the following raw materials in parts by weight: 120 parts of ordinary portland cement, 13 parts of high-iron phosphoaluminate cement, 28 parts of modified waste rubber particles, 7 parts of polyolefin elastomer, 9 parts of polypropylene fiber, 15 parts of silicon carbide powder, 7 parts of bamboo fiber powder, 13 parts of polycarboxylic acid water reducing agent, 4 parts of magnesium fluosilicate, 12 parts of slag powder, 5 parts of fly ash, 165 parts of sand, 470 parts of stones and 55 parts of water.
The rest is the same as example 1.
Performance testing
The flexible reinforced fiber concrete prepared in the examples 1 to 3 and the comparative examples 1 to 4 is tested according to GB/T50080 Standard test method for Performance of common concrete mixture; the concrete strength is tested according to GB/T50081 Standard test method for mechanical Properties of ordinary concrete. The results of the performance tests are shown in Table 1.
As can be seen from Table 1, the flexible reinforced fiber concrete of the invention can significantly improve the 28d compressive strength, 28d flexural strength, 28d tensile strength at split and bonding strength of the concrete, and reduce the 28d elastic modulus of the concrete.
Finally, it should be noted that: the above specific examples are only used to illustrate the technical solutions of the present invention, but not to limit the same; although the invention has been described in detail with reference to the foregoing specific embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (8)
1. The flexible reinforced fiber concrete is characterized by being prepared from the following raw materials in parts by weight: 130 parts of ordinary portland cement 110-containing materials, 10-15 parts of high-iron phosphoaluminate cement, 25-30 parts of modified waste rubber particles, 5-10 parts of polyolefin elastomer, 3-6 parts of flotation deinking slag fiber, 3-5 parts of modified sepiolite fiber, 10-20 parts of silicon carbide powder, 5-10 parts of bamboo fiber powder, 10-15 parts of polycarboxylic acid water reducing agent, 3-5 parts of magnesium fluosilicate, 10-15 parts of slag powder, 3-7 parts of fly ash, 170 parts of sand 160-containing materials, 480 parts of stone 460-containing materials and 50-60 parts of water.
2. The flexible reinforced fiber concrete according to claim 1, wherein the modified waste rubber particles are prepared by the following steps:
1) making waste tire into waste rubber particles with the particle size of 30-50 meshes;
2) placing the waste rubber particles in ethyl orthosilicate, standing at room temperature for 8-12h, and filtering to obtain semi-swelling colloidal particles;
3) and (3) mixing the semi-swollen colloidal particles and oleic acid according to the ratio of 1: 1, stirring the mixture at 1000r/min until the mixture is dispersed, and filtering the mixture to obtain swelling colloidal particles;
4) and adding the swelling colloidal particles into a NaOH solution with the concentration of 3mol/L, stirring for 5-10min, filtering, and drying to obtain the modified waste rubber particles.
3. The flexible reinforced fiber concrete according to claim 1, wherein the size of the flotation deinked residue fibers does not exceed 200 mesh.
4. The flexible reinforced fiber concrete according to claim 1, wherein the modified sepiolite fibers are prepared by the following method: adding sepiolite fibers into a NaOH solution with the concentration of 2.5mol/L to soak for 2 hours, washing for 2 times, adding an HCl solution with the concentration of 2.9mol/L to soak for 3 hours, washing for 3 times, and drying to obtain a primary material; and adding methyl triethoxysilane and epoxidized triglyceride into the primary material, mixing and stirring for 15min at the speed of 1000r/min, drying and crushing to obtain the modified sepiolite fiber.
5. The flexible reinforced fiber concrete according to claim 4, wherein the weight ratio of the primary material, the methyltriethoxysilane and the epoxidized triglyceride is 100: 3: 1.5.
6. the flexibly reinforced fiber concrete of claim 1, wherein the polyolefin elastomer is an ethylene-octene copolymer; the SiC content of the silicon carbide powder is more than 96.5 percent; the specific surface area of the slag powder is more than 350cm2G, density is more than or equal to 2.8g/cm3。
7. The flexible reinforced fiber concrete according to claim 1, wherein the particle size of the bamboo fiber powder is 140-160 mesh.
8. A method for preparing the flexible reinforced fiber concrete of claims 1 to 7, which is characterized by comprising the following steps:
1) uniformly mixing ordinary portland cement, high-iron phosphoaluminate cement, slag powder, fly ash, sand and stones to obtain a material A;
2) uniformly mixing modified waste rubber particles, a polyolefin elastomer, silicon carbide powder, bamboo fiber powder, a polycarboxylic acid water reducing agent and magnesium fluosilicate to obtain a material B;
3) mixing and stirring one third of the material A and the material B for 3-5min to obtain a material C;
4) adding the material C into the rest material A, mixing and stirring for 30-60s to obtain a material D;
5) and adding water into the material D, stirring for 2-4min, adding the flotation deinking residue fiber and the modified sepiolite fiber into the material D, and stirring for 3-5min to obtain the flexible reinforced fiber concrete.
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| CN114163185A (en) * | 2021-11-23 | 2022-03-11 | 万建平 | Elastic concrete and preparation method thereof |
| CN115448664A (en) * | 2022-09-21 | 2022-12-09 | 北京市高强混凝土有限责任公司 | High-strength concrete based on machine-made aggregate and preparation method thereof |
| CN115717004A (en) * | 2022-11-23 | 2023-02-28 | 沪宝新材料科技（上海）股份有限公司 | Silicate exterior wall coating and preparation method thereof |
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