Method for preparing high-wear-resistance and high-corrosion-resistance concrete from recycled aggregate

Abstract

The invention relates to the technical field of concrete, and particularly discloses a method for preparing high-wear-resistance and high-corrosion-resistance concrete from recycled aggregate, and the method comprises the following steps: dissolving dopamine in a trihydroxymethyl aminomethane-hydrochloric acid buffer solution, adding the recycled aggregate and polyaniline, and stirring to react for 2-3 hours to obtain pretreated recycled aggregate; uniformly stirring and mixing the pretreated recycled aggregate and the modified microcapsules to obtain the modified recycled aggregate, mixing cement, broken stone, fly ash, rare earth ferrosilicon powder, acrylate and the prepared modified recycled aggregate, adding a water reducing agent and water, and stirring to obtain the high-wear-resistance and high-corrosion-resistance concrete. The concrete can be used for road paving, bridge construction, seaport engineering, chemical engineering facilities and the like, and has the advantages of good wear resistance and corrosion resistance.

Description

Technical Field

[0001] This application relates to the field of concrete, and more specifically, it relates to a method for making highly wear-resistant and highly corrosion-resistant concrete using recycled aggregates. Background Art

[0002] Recycled aggregates mainly come from the recycling of waste concrete, construction gravel and other waste materials. After processes such as crushing, screening, and cleaning, they can be reused as the main aggregate component of concrete. This kind of concrete not only helps to reduce the exploitation of natural resources and the environmental pollution caused by construction waste, but also can endow the concrete with higher wear resistance and corrosion resistance through specific proportioning and modification technologies, broadening its application scope in extreme environments.

[0003] Currently, relevant technologies for recycled aggregate concrete have been developed. Usually, the recycled aggregates are pretreated to remove attached impurities such as cement mortar to improve the purity of the aggregates and the bonding strength with fresh concrete. Subsequently, by adjusting the water-cement ratio of the concrete, adding appropriate admixtures (such as water reducers, air-entraining agents, etc.) and using high-performance cement, the mechanical properties and workability of recycled aggregate concrete are improved. However, although these measures have improved the basic properties of recycled aggregate concrete to a certain extent, its durability is still insufficient when facing harsh environmental conditions such as high wear and strong corrosion, specifically manifested as serious surface wear and easy erosion and damage of the internal structure, thus restricting its application in specific engineering fields. Summary of the Invention

[0004] In order to improve the wear resistance and corrosion resistance of concrete, this application provides a method for making highly wear-resistant and highly corrosion-resistant concrete using recycled aggregates.

[0005] A method for making highly wear-resistant and highly corrosion-resistant concrete using recycled aggregates provided by this application adopts the following technical solution: A method for making highly wear-resistant and highly corrosion-resistant concrete using recycled aggregates includes the following steps: (1) Pretreatment of recycled aggregates: Dissolve dopamine in a tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution, then add recycled aggregates and polyaniline and stir and react for 2 - 3 h to obtain pretreated recycled aggregates; (2) Mix the pretreated recycled aggregates obtained above with modified microcapsules evenly to obtain the modified recycled aggregates; the modified microcapsules include a polystyrene shell layer and a triazole substance and an oily substance wrapped inside the polyethylene shell layer; (3) After mixing cement, gravel, fly ash, rare earth ferrosilicon powder, acrylate and the modified recycled aggregates prepared above, add a water reducer and water, and stir to obtain highly wear-resistant and highly corrosion-resistant concrete.

[0006] By adopting the above technical solution, during the pretreatment process of recycled aggregates, the surface performance of recycled aggregates is significantly improved through the co-deposition of dopamine and polyaniline. As a biomolecule with adhesiveness and self-polymerization ability, dopamine can form a uniform thin film on the surface of recycled aggregates. The porous recycled aggregates provide abundant attachment sites for the self-polymerization of dopamine, and the hydroxyl and carboxyl groups on its surface react with the functional groups of dopamine, thus realizing the firm bonding of dopamine and polyaniline on the surface of recycled aggregates. This thin film not only improves the surface activity and dispersibility of recycled aggregates, but also enhances the bonding strength between them and the subsequent added concrete raw materials. The addition of polyaniline further improves the wear resistance of concrete. The benzene ring structure in its molecule endows strong rigidity, forming a more solid protective layer on the surface layer of concrete, effectively resisting wear and improving the wear resistance of concrete.

[0007] Furthermore, by using microcapsule-modified aggregates, polydopamine with good adhesiveness enables better bonding between recycled aggregates and modified microcapsules. The triazole substances and oily substances encapsulated inside the microcapsules rupture and are released when the concrete is subjected to external force erosion, and interact with the concrete matrix. The triazole substances enhance the corrosion resistance of concrete by forming chemical bonds or physical adsorption with certain components in the concrete. The oily substances play a role in lubrication and filling, improving the microstructure and mechanical properties of concrete. In addition, the introduction of microcapsules also makes the concrete system more uniform and stable, reducing the risk of performance degradation of concrete caused by the performance differences between recycled aggregates and raw materials such as crushed stones.

[0008] Optionally, the raw materials in the following parts by weight are included in the preparation process of the concrete: 18 - 20 parts of recycled aggregates, 6 - 8 parts of modified microcapsules, 20 - 30 parts of cement, 5 - 8 parts of crushed stones, 10 - 15 parts of fly ash, 3 - 5 parts of rare earth ferrosilicon powder, 2 - 4 parts of acrylate, 0.6 - 0.8 parts of water reducer, and 15 - 20 parts of water.

[0009] By adopting the above technical solution, the components of each raw material are accurately proportioned. Especially the addition of recycled aggregates and modified microcapsules significantly improves the wear resistance and corrosion resistance of concrete. After pretreatment, the surface activity and dispersibility of recycled aggregates are improved, and the bonding strength with the concrete matrix is also enhanced. At the same time, the triazole substances and oily substances encapsulated inside the modified microcapsules can be released from the ruptured microcapsules and interact with the concrete matrix, further enhancing its performance.

[0010] Secondly, the addition of traditional concrete raw materials such as cement, gravel, and fly ash ensures the basic mechanical properties and stability of the concrete. Cement, as the gelling material in the concrete, provides the necessary bonding force and strength; gravel and fly ash, as aggregates and fillers, optimize the microstructure of the concrete, improving its density and durability. Further introduction of rare earth ferrosilicon powder brings additional functional characteristics to the concrete. Rare earth elements have unique electronic structures and chemical properties, which can improve the microstructure and performance of the concrete, enhancing its impermeability and corrosion resistance.

[0011] The acrylate emulsion can form a protective film inside the concrete, effectively preventing the intrusion of moisture and chemical substances, thereby extending the service life of the concrete and improving its corrosion resistance.

[0012] Optionally, the weight ratio of dopamine, tris(hydroxymethyl)aminomethane-hydrochloric acid buffer, recycled aggregate, and polyaniline added in the recycled aggregate pretreatment is 1-2:10:50:4-5.

[0013] Optionally, the modified microcapsules include the following raw materials in parts by weight: 76-96 parts of styrene monomer, 2.4-5.6 parts of initiator, 6-8 parts of triazole substances, 1-2 parts of oily substances, and 1-5 parts of emulsifier.

[0014] By adopting the above technical solution, the styrene monomer, as the main raw material of the microcapsule shell layer, forms a strong polystyrene shell layer through polymerization reaction. Filling inside the concrete improves the microstructure and uniformity of the concrete, enhancing the performance of the concrete. The triazole substances and oily substances wrapped inside are released through the rupture of the polystyrene shell layer when subjected to external force or chemical erosion, forming a protective layer on the concrete surface, improving the corrosion resistance and wear resistance of the concrete.

[0015] After adding the modified microcapsules to the concrete, the microcapsules can be evenly distributed in the concrete matrix. When the concrete is subjected to external force or chemical erosion, the microcapsule shell layer ruptures and releases the triazole substances and oily substances wrapped inside. These substances can interact with the components in the concrete to form a protective layer or fill the voids, thereby improving the wear resistance, corrosion resistance, and mechanical properties of the concrete. At the same time, the introduction of microcapsules can also improve the microstructure and uniformity of the concrete, further enhancing its comprehensive performance.

[0016] Optionally, the preparation of the modified microcapsules includes the following steps: The styrene monomer and the initiator are mixed evenly to obtain an initial mixed solution; the triazole substance is dissolved in ethanol and then added to the initial mixed solution, and an emulsifier is further added and mixed evenly by ultrasonic oscillation, and the temperature is raised to 90 - 100 °C for reaction to obtain initial microspheres; the initial microspheres are washed, dried, and screened to obtain the modified microcapsules.

[0017] Optionally, the triazole substance is any one of benzotriazole and methylbenzotriazole.

[0018] Optionally, the raw materials further include 1 - 3 parts of perfluorotripropylamine.

[0019] By adopting the above technical solution, perfluorotripropylamine, as an inert solution, can adhere to the concrete surface to reduce the surface free energy of the concrete, making it difficult for water to adhere and penetrate on the surface, thereby preventing the further penetration of corrosive components, and thus improving the corrosion resistance of the concrete.

[0020] In summary, the present application has the following beneficial effects: 1. Due to the co - deposition pretreatment of dopamine and polyaniline on the surface of recycled aggregates and the introduction of modified microcapsules in the present application, the wear resistance and corrosion resistance of the concrete are significantly enhanced. The co - deposition of dopamine and polyaniline forms a uniform film on the surface of the recycled aggregates, improving the surface activity and dispersibility of the recycled aggregates and enhancing their bonding strength with the concrete matrix. At the same time, the triazole substances and oily substances inside the modified microcapsules are released when the concrete is subjected to external force or chemical erosion, interact with the concrete matrix, and form a protective layer, further improving the wear resistance and corrosion resistance of the concrete.

[0021] 2. In the present application, the raw material components are preferably accurately proportioned. Especially the addition of traditional concrete raw materials such as recycled aggregates, modified microcapsules, cement, gravel, fly ash, etc. optimizes the microstructure of the concrete and improves its density and durability. The introduction of modified microcapsules makes the concrete system more uniform and stable, reducing the risk of performance degradation of the concrete caused by the performance differences between raw materials. At the same time, the introduction of rare - earth ferrosilicon powder brings additional functional characteristics to the concrete, improves the microstructure and performance of the concrete, and enhances its impermeability and corrosion resistance. Specific Embodiments

[0022] The following further elaborates on the present application with reference to embodiments.

[0023] For those conditions not specified in the embodiments, they are carried out according to conventional conditions or the conditions recommended by the manufacturer. For the reagents or instruments whose manufacturers are not specified, they are all conventional products that can be obtained through commercial purchase.

[0024] The crushed stones are a mixture of crushed stones with particle sizes of 5 mm to 10 mm and 10 mm to 20 mm in a mass ratio of 3:17; the water reducing agent is a polycarboxylate water reducing agent; the cement is Portland cement purchased from Sanhe Yanhong Trading Co., Ltd., with the product number ZP-001; the polyaniline is purchased from Hubei Ruiboxin Chemical Co., Ltd., CAS number: 25233-30-1.

[0025] Preparation Examples of Raw Materials and / or Intermediates Preparation Example 1 A modified microcapsule, the preparation of which comprises the following steps: 76 kg of styrene and 2.4 kg of benzoyl peroxide are ultrasonically mixed evenly to obtain an initial mixed solution; 7 kg of benzotriazole is dissolved in 10 kg of ethanol and then added to the initial mixed solution. Then, 2.5 kg of sodium dodecyl sulfonate and 1 kg of linseed oil are added and mixed evenly by ultrasonic oscillation. The temperature is raised to 90 °C and the reaction is carried out for 4.5 h to obtain initial microspheres; the initial microspheres are washed with water and methanol in sequence, dried, and screened to obtain modified microcapsules with a particle size of 10 - 20 μm.

[0026] Preparation Example 2 A modified microcapsule, the preparation of which comprises the following steps: 96 kg of styrene and 5.6 kg of benzoyl peroxide are ultrasonically mixed evenly to obtain an initial mixed solution; 6 kg of methylbenzotriazole is dissolved in 10 kg of ethanol and then added to the initial mixed solution. Then, 1 kg of sodium dodecyl sulfonate and 1.5 kg of linseed oil are added and mixed evenly by ultrasonic oscillation. The temperature is raised to 100 °C and the reaction is carried out for 4 h to obtain initial microspheres; the initial microspheres are washed with water and methanol in sequence, dried, and screened to obtain modified microcapsules with a particle size of 10 - 20 μm.

[0027] Preparation Example 3 A modified microcapsule, the preparation of which comprises the following steps: 86 kg of styrene and 4 kg of benzoyl peroxide are ultrasonically mixed evenly to obtain an initial mixed solution; 8 kg of benzotriazole is dissolved in 10 kg of ethanol and then added to the initial mixed solution. Then, 2.5 kg of sodium dodecyl sulfonate and 2 kg of linseed oil are added and mixed evenly by ultrasonic oscillation. The temperature is raised to 90 °C and the reaction is carried out for 4.5 h to obtain initial microspheres; the initial microspheres are washed with water and methanol in sequence, dried, and screened to obtain modified microcapsules with a particle size of 10 - 20 μm.

[0028] Preparation Example 4 A modified microcapsule, which is different from Preparation Example 1 in that the triazole compound used in this preparation example is 1,2,4-triazole. Examples

[0029] Example 1 A method for making highly wear-resistant and highly corrosion-resistant concrete using recycled aggregates, comprising the following steps: (1) Pretreatment of recycled aggregates: Dissolve 0.76 kg of dopamine in 3.8 kg of tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution, then add 19 kg of recycled aggregates and 1.52 kg of polyaniline and stir and react for 2 h to obtain pretreated recycled aggregates; (2) Mix the pretreated recycled aggregates obtained above with 7 kg of modified microcapsules evenly to obtain the modified recycled aggregates; the modified microcapsules are those prepared in Preparation Example 1; (3) After mixing 25 kg of cement, 6.5 kg of crushed stones, 15 kg of fly ash, 4 kg of rare earth ferrosilicon powder, 3 kg of acrylate and the modified recycled aggregates prepared above, add 0.7 kg of water reducer and 20 kg of water, and stir to obtain highly wear-resistant and highly corrosion-resistant concrete.

[0030] Example 2 A method for making highly wear-resistant and highly corrosion-resistant concrete using recycled aggregates, comprising the following steps: (1) Pretreatment of recycled aggregates: Dissolve 0.36 kg of dopamine in 3.6 kg of tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution, then add 18 kg of recycled aggregates and 1.8 kg of polyaniline and stir and react for 2 h to obtain pretreated recycled aggregates; (2) Mix the pretreated recycled aggregates obtained above with 8 kg of modified microcapsules evenly to obtain the modified recycled aggregates; the modified microcapsules are those prepared in Preparation Example 1; (3) After mixing 20 kg of cement, 5 kg of crushed stones, 10 kg of fly ash, 3 kg of rare earth ferrosilicon powder, 4 kg of acrylate and the modified recycled aggregates prepared above, add 0.6 kg of water reducer and 15 kg of water, and stir to obtain highly wear-resistant and highly corrosion-resistant concrete.

[0031] Example 3 A method for making highly wear-resistant and highly corrosion-resistant concrete using recycled aggregates, comprising the following steps: (1) Pretreatment of recycled aggregates: Dissolve 0.6 kg of dopamine in 4 kg of tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution, then add 20 kg of recycled aggregates and 1.8 kg of polyaniline and stir and react for 3 h to obtain pretreated recycled aggregates; (2) Mix the pretreated recycled aggregates obtained above with 6 kg of modified microcapsules evenly to obtain the modified recycled aggregates; the modified microcapsules are those prepared in Preparation Example 1; (3) Mix 30 kg of cement, 8 kg of crushed stone, 12.5 kg of fly ash, 5 kg of rare earth ferrosilicon powder, 2 kg of acrylate, and the modified recycled aggregate prepared above, then add 0.8 kg of water reducer and 17 kg of water, and stir to obtain high wear-resistant and high corrosion-resistant concrete.

[0032] Example 4 A method for making high wear-resistant and high corrosion-resistant concrete using recycled aggregate, which is different from Example 1 in that the modified microcapsules used in this example are those prepared in Preparation Example 2.

[0033] Example 5 A method for making high wear-resistant and high corrosion-resistant concrete using recycled aggregate, which is different from Example 1 in that the modified microcapsules used in this example are those prepared in Preparation Example 3.

[0034] Example 6 A method for making high wear-resistant and high corrosion-resistant concrete using recycled aggregate, which is different from Example 1 in that 3 kg of perfluorotripropylamine is further added in this example. The specific steps are as follows: (1) Pretreatment of recycled aggregate: Dissolve 0.76 kg of dopamine in 3.8 kg of tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution, then add 19 kg of recycled aggregate and 1.52 kg of polyaniline, and stir and react for 2 h to obtain pretreated recycled aggregate; (2) Stir and mix the above pretreated recycled aggregate with 7 kg of modified microcapsules to obtain the modified recycled aggregate; the modified microcapsules are those prepared in Preparation Example 1; (3) Mix 25 kg of cement, 6.5 kg of crushed stone, 15 kg of fly ash, 4 kg of rare earth ferrosilicon powder, 3 kg of acrylate, 3 kg of perfluorotripropylamine, and the modified recycled aggregate prepared above, then add 0.7 kg of water reducer and 20 kg of water, and stir to obtain high wear-resistant and high corrosion-resistant concrete.

[0035] Example 7 A method for making high wear-resistant and high corrosion-resistant concrete using recycled aggregate, which is different from Example 6 in that 2 kg of perfluorotripropylamine is further added in this example.

[0036] Example 8 A method for making high wear-resistant and high corrosion-resistant concrete using recycled aggregate, which is different from Example 6 in that 1 kg of perfluorotripropylamine is further added in this example.

[0037] Example 9 A method for making highly wear-resistant and highly corrosion-resistant concrete using recycled aggregates, which is different from Example 1 in that the modified microcapsules used in this example are those prepared in Preparation Example 4.

[0038] Comparative Example Comparative Example 1 A method for making highly wear-resistant and highly corrosion-resistant concrete using recycled aggregates, which is different from Example 1 in that the aggregates are not pretreated in this comparative example. The specific steps are as follows: (1) Take 19 kg of recycled aggregates and 7 kg of modified microcapsules, stir and mix them evenly to obtain the modified recycled aggregates; the modified microcapsules are those prepared in Preparation Example 1; (2) After mixing 25 kg of cement, 6.5 kg of crushed stones, 15 kg of fly ash, 4 kg of rare earth ferrosilicon powder, 3 kg of acrylate, and the above-prepared modified recycled aggregates, add 0.7 kg of water reducer and 20 kg of water, and stir to obtain highly wear-resistant and highly corrosion-resistant concrete.

[0039] Comparative Example 2 A method for making highly wear-resistant and highly corrosion-resistant concrete using recycled aggregates, which is different from Example 1 in that aniline is not added during the pretreatment of the recycled aggregates. The specific steps are as follows: (1) Pretreatment of recycled aggregates: Dissolve 0.76 kg of dopamine in 3.8 kg of tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution, and then add 19 kg of recycled aggregates and stir and react for 2 h to obtain pretreated recycled aggregates; (2) Stir and mix the above-pretreated recycled aggregates with 7 kg of modified microcapsules evenly to obtain the modified recycled aggregates; the modified microcapsules are those prepared in Preparation Example 1; (3) After mixing 25 kg of cement, 6.5 kg of crushed stones, 15 kg of fly ash, 4 kg of rare earth ferrosilicon powder, 3 kg of acrylate, and the above-prepared modified recycled aggregates, add 0.7 kg of water reducer and 20 kg of water, and stir to obtain highly wear-resistant and highly corrosion-resistant concrete.

[0040] Comparative Example 3 A method for making highly wear-resistant and highly corrosion-resistant concrete using recycled aggregates, which is different from Example 1 in that no modified microcapsules are added. The specific steps are as follows: (1) Pretreatment of recycled aggregates: Dissolve 0.76 kg of dopamine in 3.8 kg of tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution, and then add 19 kg of recycled aggregates and 1.52 kg of aniline and stir and react for 2 h to obtain pretreated recycled aggregates; (3) Mix 25 kg of cement, 6.5 kg of crushed stone, 15 kg of fly ash, 4 kg of rare earth ferrosilicon powder, 3 kg of acrylate, and the above-mentioned pretreated recycled aggregate, then add 0.7 kg of water reducing agent and 20 kg of water, and stir to obtain high wear-resistant and high corrosion-resistant concrete.

[0041] Comparative Example 4 A method for making high wear-resistant and high corrosion-resistant concrete using recycled aggregate, which is different from Example 1 in that dopamine is not used to pretreat the recycled aggregate in this comparative example. The specific steps are as follows: (1) Pretreatment of recycled aggregate: Stir and react 19 kg of recycled aggregate and 1.52 kg of polyaniline for 2 h to obtain pretreated recycled aggregate; (2) Mix the above-mentioned pretreated recycled aggregate with 7 kg of modified microcapsules evenly to obtain the modified recycled aggregate; the modified microcapsules are prepared in Preparation Example 1; (3) Mix 25 kg of cement, 6.5 kg of crushed stone, 15 kg of fly ash, 4 kg of rare earth ferrosilicon powder, 3 kg of acrylate, and the above-prepared modified recycled aggregate, then add 0.7 kg of water reducing agent and 20 kg of water, and stir to obtain high wear-resistant and high corrosion-resistant concrete.

[0042] Performance detection test Detection method / test method Wear resistance: According to the regulations in "Test Regulations for Cement and Cement Concrete in Highway Engineering" JTGE30 - 2005 and "Test Method for Abrasion Resistance of Cement Mortar" JC / T421 - 1991, use a TMS - 04 type cement mortar / concrete abrasion testing machine with a flower wheel grinding head to conduct abrasion tests, and calculate the abrasion value of the concrete after 28 d; Corrosion resistance: Make specimens according to "Standard for Test Methods of Long - term Performance and Durability of Ordinary Concrete" GB / T 50082 - 2009, and test the Cl - diffusion coefficient and the weight loss rate of steel bar corrosion after one year.

[0043] Table 1 Test detection results Wear value g / cm2 <![CDATA[Chloride ion diffusion coefficient (10 -12 m 2 / s)]]> Weight loss rate / % Example 1 0.023 1.2 0.15 Example 2 0.025 1.4 0.13 Example 3 0.024 1.5 0.14 Example 4 0.026 1.5 0.16 Example 5 0.025 1.3 0.15 Example 6 0.02 0.9 0.11 Example 7 0.019 0.8 0.09 Example 8 0.021 1.1 0.10 Example 9 0.031 1.6 0.19 Comparative Example 1 0.15 3 2.5 Comparative Example 2 0.12 2.8 2.3 Comparative Example 3 0.1 2.6 2 Comparative Example 4 0.13 2.9 2.4 Combined with Examples 1 - 3 and Comparative Examples 1 - 2 and Table 1, it can be seen that the experimental data of Examples 1 - 3 are better than those of Comparative Examples 1 - 2, indicating that dopamine and polyaniline can be well deposited on the surface of recycled concrete to form a uniform film. On the one hand, it improves the compatibility between recycled aggregate and other raw materials, and on the other hand, the polyaniline attached to it can well play its wear - resistant and anti - corrosion effects, improving the wear resistance and corrosion resistance of the concrete.

[0044] Combined with Examples 1-3 and Comparative Examples 3 and 4 and Table 1, it can be seen that the experimental data of Examples 1-3 are all better than those of Comparative Examples 3 and 4, indicating that the addition of the modified microcapsules can have better compatibility with the regenerated aggregates coated with polydopamine, and are evenly distributed in the concrete after mixing, improving the microstructure of the concrete and enhancing the performance of the concrete. When damaged by external forces or chemical corrosion, the internal triazole substances and oily substances are released, thus further improving the wear resistance and corrosion resistance of the concrete.

[0045] Combined with Examples 1-5 and Table 1, it can be seen that the test data of the concrete prepared in Examples 1-5 are not much different, indicating that the concrete prepared by using the method provided in this application all has good corrosion resistance and wear resistance.

[0046] Combined with Example 1 and Examples 6-8 and Table 1, it can be seen that the test data of Examples 6-8 are all better than those of Example 1, indicating that perfluorotripropylamine can adhere to the surface of the concrete to prevent the further penetration of corrosive components, and cooperate with the other components in the raw materials to jointly improve the corrosion resistance of the material.

[0047] Combined with Examples 1-3 and Example 9, it can be seen that the test data of Examples 1-3 are all better than those of Example 9, indicating that when any one of benzotriazole and methylbenzotriazole is selected, it has a better protective effect and improves the corrosion resistance of the concrete.

[0048] This specific embodiment is only an interpretation of this application, and it is not a limitation of this application. Those skilled in the art can make modifications without creative contributions to this embodiment according to needs after reading this specification, but as long as they are within the scope of the claims of this application, they are protected by the patent law.

Claims

1. A method for making highly wear-resistant and highly corrosion-resistant concrete using recycled aggregates, characterized in that It includes the following steps: (1) Pretreatment of recycled aggregate: Dissolve dopamine in tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution, then add recycled aggregate and polyaniline and stir and react for 2-3 h to obtain pretreated recycled aggregate; (2) Stir and mix the pretreated recycled aggregate obtained above with modified microcapsules to obtain the modified recycled aggregate; the modified microcapsules include a polystyrene shell layer, a triazole substance and an oily substance wrapped in the polyethylene shell layer; (3) Mix cement, crushed stone, fly ash, rare earth ferrosilicon powder, acrylate and the modified recycled aggregate prepared above, add a water reducing agent and water, and stir to obtain high wear-resistant and high corrosion-resistant concrete.

2. A method for making highly wear-resistant and highly corrosion-resistant concrete using recycled aggregate according to claim 1, characterized in that, The following raw materials in parts by weight are included in the preparation process of the concrete: 18-20 parts of recycled aggregate, 6-8 parts of modified microcapsules, 20-30 parts of cement, 5-8 parts of crushed stone, 10-15 parts of fly ash, 3-5 parts of rare earth ferrosilicon powder, 2-4 parts of acrylate, 0.6-0.8 parts of water reducing agent, 15-20 parts of water.

3. A method for making highly wear-resistant and highly corrosion-resistant concrete using recycled aggregates according to claim 1, characterized in that: In the pretreatment of the recycled aggregate, the weight ratio of dopamine, tris(hydroxymethyl)aminomethane-hydrochloric acid buffer solution, recycled aggregate and polyaniline is 1-2:10:50:4-5.

4. A method for making highly wear-resistant and highly corrosion-resistant concrete using recycled aggregates according to claim 1, characterized in that, The modified microcapsules include the following raw materials in parts by weight: 76-96 parts of styrene monomer, 2.4-5.6 parts of initiator, 6-8 parts of triazole substance, 1-2 parts of oily substance, 1-5 parts of emulsifier.

5. A method for making highly wear-resistant and highly corrosion-resistant concrete using recycled aggregates according to claim 4, characterized in that: The preparation of the modified microcapsules includes the following steps: Mix the styrene monomer and the initiator evenly to obtain an initial mixed solution; dissolve the triazole substance in ethanol and add it to the initial mixed solution, then continue to add the emulsifier and mix evenly by ultrasonic oscillation, heat up to 90-100 °C and react to obtain initial microspheres; wash, dry and screen the initial microspheres to obtain the modified microcapsules.

6. A method for making highly wear-resistant and highly corrosion-resistant concrete using recycled aggregate according to claim 1, characterized in that: The triazole substance is any one of benzotriazole and methylbenzotriazole.

7. A method for making highly wear-resistant and highly corrosion-resistant concrete using recycled aggregates according to claim 2, characterized in that: The raw materials also include 1-3 parts of perfluorotripropylamine.

8. High wear-resistant and high corrosive concrete prepared by the preparation method according to any one of claims 1-7.