Process for preparing a crack-resistant and wear-resistant concrete

Abstract

The application relates to the field of water conservancy engineering construction, and particularly discloses a preparation process of crack-resistant and wear-resistant concrete. The preparation process of the crack-resistant and wear-resistant concrete comprises the following steps: uniformly mixing and stirring cement, sand, admixture and water according to proportions, uniformly stirring after adding gravel, and finally uniformly mixing and stirring to obtain the concrete after adding an additive and a crack-resistant agent. The concrete is prepared by using the following raw materials in weight parts: 1100-1300 parts of gravel, 600-800 parts of sand, 250-350 parts of cement, 160-180 parts of water, 50-70 parts of admixture, 2-3 parts of the additive and 3-7 parts of the crack-resistant agent. The concrete can be used in water conservancy engineering construction and has the advantages of reducing cracking.

Description

TECHNICAL FIELD

[0001] The application relates to the field of hydraulic engineering construction, in particular to a preparation process of anti-cracking and wear-resistant concrete. BACKGROUND

[0002] For hydraulic engineering construction, the building materials usually have high requirements, especially for rivers with extremely fast water flow, the flow speed of which can reach 40-50 m / s, so the building materials are required to have good anti-erosion, wear resistance and anti-cracking ability while maintaining high strength.

[0003] In order to improve the strength of hydraulic concrete, the commonly used way is to reduce the water-binder ratio, which can enhance the anti-erosion and wear resistance of the concrete while improving the strength of the concrete.

[0004] For the above-mentioned way, the method of using low water-binder ratio to improve the strength of the concrete can cause the internal cementitious material hydrate to close the capillary pore channel in the hydration process, so that the external water cannot move freely to the inside, the concrete internal dries and shrinks, which is prone to cracking. SUMMARY

[0005] In order to reduce the cracking of high-strength wear-resistant concrete and improve its anti-cracking ability, the application provides a preparation process of anti-cracking and wear-resistant concrete, which adopts the following technical scheme:

[0006] The preparation process of the anti-cracking and wear-resistant concrete comprises the following steps: mixing and stirring cement, sand, admixture, anti-erosion and wear-resistant fluidizing agent and water in proportion, then adding crushed stone and stirring uniformly, and finally adding additive and anti-cracking agent and stirring uniformly to obtain the concrete.

[0007] By adopting the above technical scheme, the cement, sand, admixture, anti-erosion and wear-resistant fluidizing agent and water are mixed to obtain mortar, and then the mortar and crushed stone are stirred uniformly, so as to effectively improve the mixing uniformity of each component of the concrete, and finally the additive and anti-cracking agent are added, which is beneficial to improving the strength of the concrete and reducing the cracking of the concrete and improving the anti-cracking ability of the hydraulic concrete building.

[0008] Preferably, the raw materials of the concrete are as follows in terms of weight fraction: 1100-1300 parts of crushed stone, 600-800 parts of sand, 250-350 parts of cement, 160-180 parts of water, 50-70 parts of admixture, 2-3 parts of additive, 4-8 parts of anti-cracking agent and 7-11 parts of anti-erosion and wear-resistant fluidizing agent.

[0009] By adopting the technical scheme, the admixture and the additive are mixed into the concrete, so that the water consumption of the concrete is reduced, the water consumption is reduced, the water-binder ratio of the concrete is reduced, the strength and wear resistance of the concrete are improved by reducing the water-binder ratio, and when the concrete shrinks, the anti-cracking performance of the concrete is improved due to the addition of the anti-cracking agent, so that the cracks on the concrete building are effectively reduced.

[0010] Preferably, the admixture includes fly ash and slag, and the weight ratio of the fly ash and the slag is 1:1.

[0011] By adopting the technical scheme, the fly ash and the slag are mixed to promote the late strength growth of the concrete, improve the fluidity of the concrete, and reduce the use of the additive, so that the strength reduction of the concrete due to the increase of the additive is improved.

[0012] Preferably, the additive includes a water reducing agent and an expansive agent, and the weight ratio of the water reducing agent and the expansive agent is 1:1.

[0013] By adopting the technical scheme, the water reducing agent reduces the water consumption of the concrete, so that the water-binder ratio of the concrete is reduced, which is beneficial to improve the strength of the concrete, and the use of the expansive agent is beneficial to compensate for the shrinkage of the concrete when the concrete shrinks, thereby reducing the cracks of the concrete and reducing the adverse effects of the cracks of the concrete.

[0014] Preferably, the anti-cracking agent includes modified fibers, a connecting agent and a reinforcing agent, the reinforcing agent is loaded on the modified fibers, and the connecting agent is coated on the modified fibers loaded with the reinforcing agent.

[0015] By adopting the technical scheme, the reinforcing agent enhances the performance of the modified fibers, changes the surface roughness of the fibers while improving the strength of the modified fibers, the connecting agent improves the connection strength of the reinforcing agent on the modified fibers, and the modified fibers loaded with the reinforcing agent are connected with other components in the concrete, thereby forming a three-dimensional network structure and reducing the dry shrinkage cracking of the concrete.

[0016] Preferably, the modified fibers are polypropylene fibers treated by acid and alkali.

[0017] By adopting the technical scheme, the surface roughness of the polypropylene fibers is improved after the acid and alkali treatment, so that grooves for loading the reinforcing agent are formed, the connection strength of the reinforcing agent on the polypropylene fibers is effectively improved, and the connecting agent is also beneficial to adhere to the polypropylene fibers, thereby improving the overall performance of the anti-cracking agent.

[0018] Preferably, the connecting agent is a mixed solution of tannin and polyethylene imine.

[0019] By adopting the technical scheme, the mixed solution of tannic acid and polyethylene imine forms a corresponding protective film on the surface of the modified fiber loaded with the reinforcing agent, which improves the connection strength of the reinforcing agent on the surface of the modified fiber and improves the hydrophilicity of the anti-cracking agent, so that the anti-cracking agent is more conducive to mixing with other components to play a role, and the anti-cracking agent is dispersed in the concrete to form a three-dimensional network structure to reduce concrete cracking.

[0020] Preferably, the reinforcing agent is a nano MOFs crystal particle.

[0021] By adopting the technical scheme, the nano MOFs crystal particle is formed on the surface of the modified fiber, so that the strength of the modified fiber is enhanced, and the roughness of the surface of the modified fiber is changed, so that the modified fiber can be better mixed with other components to form a three-dimensional network structure to reduce concrete cracking.

[0022] Preferably, the anti-cracking agent is prepared by the following steps: the modified fiber is first subjected to a reinforcing treatment by the reinforcing agent, and then is subjected to a surface modification by the connecting agent, so as to prepare the anti-cracking agent.

[0023] By adopting the technical scheme, the surface of the polypropylene fiber is treated by acid and alkali to form grooves, so that the roughness of the surface of the polypropylene fiber is improved, and the strength of the polypropylene fiber is reduced, at this time, the reinforcing agent is attached to the grooves, so that the roughness of the surface of the polypropylene fiber is further improved, and the strength of the polypropylene fiber is also improved, and finally the connecting agent tightly combines the polypropylene fiber and the reinforcing agent, so that the overall stability of the anti-cracking agent is improved.

[0024] In summary, the present application has the following beneficial effects:

[0025] 1. Due to the preparation process of the present application, the cement, sand, admixture, anti-impact and wear-resistant fluidizing agent and water are mixed to prepare a mortar, which is then uniformly stirred with gravel to improve the mixing uniformity, and finally the additive and the anti-cracking agent are added to reduce concrete cracking and improve the anti-cracking ability of the hydraulic concrete building.

[0026] 2. In the present application, the reinforcing agent enhances the performance of the modified fiber, improves the strength of the modified fiber, changes the roughness of the fiber surface, and the connecting agent improves the connection strength of the reinforcing agent on the modified fiber and enhances the modified fiber, which is conducive to the connection of the modified fiber loaded with the reinforcing agent with other components in the concrete to form a three-dimensional network structure to reduce concrete drying shrinkage cracking.

[0027] 3、The polypropylene fiber surface in the application is roughened after acid and alkali treatment, thereby forming grooves for loading the reinforcing agent, then forming nano MOFs crystalline particles on the modified fiber surface, thereby enhancing the strength of the modified fiber and changing the roughness of the modified fiber surface, forming a corresponding protective film on the modified fiber surface loaded with the reinforcing agent by using a mixed solution of tannic acid and polyethyleneimine, which on the one hand enhances the connection strength of the reinforcing agent on the modified fiber surface, and on the other hand improves the hydrophilicity of the anti-cracking agent, which is more conducive to the mixing of the anti-cracking agent with other components to play a role, and the anti-cracking agent is dispersed in the concrete to form a three-dimensional network structure to reduce the cracking of the concrete. DETAILED DESCRIPTION

[0028] In the application, the crushed stone is basalt crushed stone, the maximum nominal particle size is 31.5 mm, the continuity grading is used, and the corresponding sieve size and cumulative sieve residue are 2.35 mm 95%, 4.75 mm 92.8%, 9.5 mm 82.3%, 16 mm 63.5%, 19 mm 38.7%, 26.5 mm 9.5%, and 31.5 mm 0.9%; the sand is medium sand in region II, the machine-made sand fineness modulus is 2.8; the fly ash is grade I fly ash; the mineral powder is S95 grade mineral powder; the water reducing agent is a polycarboxylic acid water reducing agent; the expansive agent is a magnesia concrete expansive agent; the polypropylene fiber length is 16 mm; and the anti-impact and wear-resistant fluidizing agent is HCM-HF anti-impact and wear-resistant fluidizing agent.

[0029] The application will be further described in detail below in combination with examples.

[0030] Preparation Example

[0031] Preparation Example 1

[0032] The preparation example discloses an anti-cracking agent prepared by the following steps:

[0033] S1, fiber modification: first immerse the polypropylene fiber in a sodium hydroxide solution with a concentration of 1 mol / L, soak at 40℃ for 6h, wash with deionized water for three times, and dry at 80℃ for 12h; then immerse the alkali-treated polypropylene fiber in a hydrochloric acid solution with a concentration of 1 mol / L, soak at 40℃ for 6h, wash with deionized water for three times, and dry at 80℃ for 12h to obtain the modified fiber;

[0034] S2, surface crystallization: mix the methanol solution of zinc nitrate hexahydrate with a mass fraction of 1% and the methanol solution of 2-methylimidazole with a mass fraction of 1% according to a mass ratio of 1:1, immerse the modified fiber prepared in S1 in the mixed solution, take out after 6h of reaction at 40℃, wash with deionized water for three times, and dry at 80℃ for 12h to complete the attachment of nano MOFs crystalline particles;

[0035] S3, outermost layer attachment: a 5% tannic acid aqueous solution and a 30% polyethyleneimine aqueous solution are mixed in a weight ratio of 1:3, the modified fiber with nano MOFs crystal particles attached is immersed therein, taken out after soaking for 2 h, and dried at 80°C for 12 h to prepare the anti-cracking agent.

[0036] Preparation Example 2

[0037] The present preparation example discloses an anti-cracking agent prepared by the following steps:

[0038] S1, fiber modification: first, the polypropylene fiber is soaked in a 1 mol / L sodium hydroxide solution at 40°C for 6 h, washed with deionized water three times, then the alkali-treated polypropylene fiber is soaked in a 1 mol / L hydrochloric acid solution at 40°C for 6 h, washed with deionized water three times, and dried at 80°C for 12 h to prepare the modified fiber;

[0039] S2, surface crystallization: a 1% zinc nitrate hexahydrate methanol solution and a 1% 2-methylimidazole methanol solution are mixed in a mass ratio of 1:1, the modified fiber prepared in S1 is immersed therein, taken out after 40°C reaction for 6 h, washed with deionized water three times, and dried at 80°C for 12 h to complete the attachment of nano MOFs crystal particles, thereby preparing the anti-cracking agent.

[0040] Preparation Example 3

[0041] The present preparation example discloses an anti-cracking agent prepared by the following steps:

[0042] S1, fiber modification: first, the polypropylene fiber is soaked in a 1 mol / L sodium hydroxide solution at 40°C for 6 h, washed with deionized water three times, then the alkali-treated polypropylene fiber is soaked in a 1 mol / L hydrochloric acid solution at 40°C for 6 h, washed with deionized water three times, and dried at 80°C for 12 h to prepare the modified fiber;

[0043] S2, outermost layer attachment: a 5% tannic acid aqueous solution and a 30% polyethyleneimine aqueous solution are mixed in a weight ratio of 1:3, the modified fiber prepared in S1 is immersed therein, taken out after soaking for 2 h, and dried at 80°C for 12 h to prepare the anti-cracking agent.

[0044] Preparation Example 4

[0045] The present preparation example discloses an anti-cracking agent prepared by the following steps:

[0046] The polypropylene fiber is soaked in 1 mol / L sodium hydroxide solution at 40°C for 6 hours, washed with deionized water for three times, soaked in 1 mol / L hydrochloric acid solution at 40°C for 6 hours, washed with deionized water for three times, and dried at 80°C for 12 hours to obtain the anti-cracking agent.

[0047] Example

[0048] Example 1

[0049] The anti-cracking wear-resistant concrete is prepared by the following steps:

[0050] S1, 250 kg of cement, 600 kg of sand, 25 kg of fly ash, 25 kg of mineral powder, 7 kg of anti-impact wear-resistant fluidizing agent, and 160 kg of water are stirred and mixed to obtain a mortar;

[0051] S2, 1100 kg of gravel is added to the mortar prepared in S1 and stirred and mixed;

[0052] S3, 1 kg of water reducing agent, 1 kg of expanding agent, and 4 kg of the anti-cracking agent prepared in Preparation Example 1 are continuously added and stirred and mixed uniformly to obtain the concrete.

[0053] Example 2

[0054] The anti-cracking wear-resistant concrete is prepared by the following steps:

[0055] S1, 300 kg of cement, 700 kg of sand, 30 kg of fly ash, 30 kg of mineral powder, 9 kg of anti-impact wear-resistant fluidizing agent, and 170 kg of water are stirred and mixed to obtain a mortar;

[0056] S2, 1200 kg of gravel is added to the mortar prepared in S1 and stirred and mixed;

[0057] S3, 1.25 kg of water reducing agent, 1.25 kg of expanding agent, and 6 kg of the anti-cracking agent prepared in Preparation Example 1 are continuously added and stirred and mixed uniformly to obtain the concrete.

[0058] Example 3

[0059] The anti-cracking wear-resistant concrete is prepared by the following steps:

[0060] S1, 350 kg of cement, 800 kg of sand, 35 kg of fly ash, 35 kg of mineral powder, 11 kg of anti-impact wear-resistant fluidizing agent, and 180 kg of water are stirred and mixed to obtain a mortar;

[0061] S2, 1300 kg of gravel is added to the mortar prepared in S1 and stirred and mixed;

[0062] S3, continue to add 1.5 kg water reducing agent, 1.5 kg expanding agent and 8 kg anti-cracking agent prepared in Preparation Example 1, and stir to mix uniformly to obtain the concrete.

[0063] Example 4

[0064] This example discloses a kind of anti-cracking wear-resistant concrete, which is prepared by the following steps:

[0065] S1, 300 kg cement, 700 kg sand, 60 kg fly ash, 9 kg impact-resistant wear-resistant fluidizing agent and 170 kg water are stirred and mixed to obtain mortar;

[0066] S2, 1200 kg gravel is added to the mortar prepared in S1 and stirred and mixed;

[0067] S3, continue to add 1.25 kg water reducing agent, 1.25 kg expanding agent and 6 kg anti-cracking agent prepared in Preparation Example 1, and stir to mix uniformly to obtain the concrete.

[0068] Example 5

[0069] This example discloses a kind of anti-cracking wear-resistant concrete, which is prepared by the following steps:

[0070] S1, 300 kg cement, 700 kg sand, 60 kg fly ash, 9 kg impact-resistant wear-resistant fluidizing agent and 170 kg water are stirred and mixed to obtain mortar;

[0071] S2, 1200 kg gravel is added to the mortar prepared in S1 and stirred and mixed;

[0072] S3, continue to add 1.25 kg water reducing agent, 1.25 kg expanding agent and 6 kg anti-cracking agent prepared in Preparation Example 1, and stir to mix uniformly to obtain the concrete.

[0073] Example 6

[0074] This example discloses a kind of anti-cracking wear-resistant concrete, which is prepared by the following steps:

[0075] S1, 300 kg cement, 700 kg sand, 60 kg fly ash, 9 kg impact-resistant wear-resistant fluidizing agent and 170 kg water are stirred and mixed to obtain mortar;

[0076] S2, 1200 kg gravel is added to the mortar prepared in S1 and stirred and mixed;

[0077] S3, continue to add 1.25 kg water reducing agent, 1.25 kg expanding agent and 6 kg anti-cracking agent prepared in Preparation Example 1, and stir to mix uniformly to obtain the concrete.

[0078] Example 7

[0079] The embodiment discloses a kind of anti-cracking wear-resistant concrete, which is prepared by the following steps:

[0080] S1, 300kg cement, 700kg sand, 30kg fly ash, 30kg mineral powder, 9kg impact-resistant wear-resistant fluidizing agent and 170kg water are stirred and mixed to prepare mortar;

[0081] S2, 1200kg gravel is added to the mortar prepared in S1 and stirred and mixed;

[0082] S3, continue to add 2.5kg expanding agent and 6kg anti-cracking agent prepared in Preparation Example 1, and stir and mix uniformly to prepare concrete.

[0083] Example 8

[0084] The embodiment discloses a kind of anti-cracking wear-resistant concrete, which is prepared by the following steps:

[0085] S1, 300kg cement, 700kg sand, 30kg fly ash, 30kg mineral powder, 9kg impact-resistant wear-resistant fluidizing agent and 170kg water are stirred and mixed to prepare mortar;

[0086] S2, 1200kg gravel is added to the mortar prepared in S1 and stirred and mixed;

[0087] S3, continue to add 1.25kg water reducing agent, 1.25kg expanding agent and 6kg anti-cracking agent prepared in Preparation Example 2, and stir and mix uniformly to prepare concrete.

[0088] Example 9

[0089] The embodiment discloses a kind of anti-cracking wear-resistant concrete, which is prepared by the following steps:

[0090] S1, 300kg cement, 700kg sand, 30kg fly ash, 30kg mineral powder, 9kg impact-resistant wear-resistant fluidizing agent and 170kg water are stirred and mixed to prepare mortar;

[0091] S2, 1200kg gravel is added to the mortar prepared in S1 and stirred and mixed;

[0092] S3, continue to add 1.25kg water reducing agent, 1.25kg expanding agent and 6kg anti-cracking agent prepared in Preparation Example 3, and stir and mix uniformly to prepare concrete.

[0093] Example 10

[0094] The embodiment discloses a kind of anti-cracking wear-resistant concrete, which is prepared by the following steps:

[0095] S1, 300kg cement, 700kg sand, 30kg fly ash, 30kg mineral powder, 9kg impact-resistant wear-resistant fluidizing agent and 170kg water are stirred and mixed to prepare mortar;

[0096] S2, 1200 kg of crushed stone was added to the mortar prepared in S1 and mixed;

[0097] S3, 1.25 kg of water reducing agent, 1.25 kg of expanding agent and 6 kg of the anti-cracking agent prepared in Preparation Example 4 were continuously added and mixed to prepare concrete.

[0098] Example 11

[0099] This example discloses an anti-cracking and wear-resistant concrete prepared by the following steps:

[0100] S1, 300 kg of cement, 700 kg of sand, 30 kg of fly ash, 30 kg of mineral powder, 9 kg of impact and wear-resistant fluidizing agent and 170 kg of water were mixed to prepare mortar;

[0101] S2, 1200 kg of crushed stone was added to the mortar prepared in S1 and mixed;

[0102] S3, 1.25 kg of water reducing agent, 1.25 kg of expanding agent and 6 kg of polypropylene fiber as anti-cracking agent were continuously added and mixed to prepare concrete.

[0103] Comparative Example 1

[0104] This comparative example discloses a concrete prepared by the following steps:

[0105] S1, 300 kg of cement, 700 kg of sand, 30 kg of fly ash, 30 kg of mineral powder, 9 kg of impact and wear-resistant fluidizing agent and 170 kg of water were mixed to prepare mortar;

[0106] S2, 1200 kg of crushed stone was added to the mortar prepared in S1 and mixed;

[0107] S3, 1.25 kg of water reducing agent and 1.25 kg of expanding agent were continuously added and mixed to prepare concrete.

[0108] Table 1 Raw material table (kg) of examples and comparative examples

[0109]

[0110]

[0111] Performance test slump: according to GB / T50080-2016 "Standard Test Methods for Properties of Fresh Ordinary Concrete", 4.1 slump test, record the slump value.

[0112] 28d compressive strength: refer to GB / T 50081-2002 ordinary concrete mechanical properties test method standard 6 compressive strength test, using standard test specimen for detection.

[0113] 28d flexural strength: refer to GB / T 50081-2002 ordinary concrete mechanical properties test method standard 10 flexural strength test, using standard test specimen for detection.

[0114] The ratio of compressive strength to flexural strength: the ratio of compressive strength to flexural strength is mainly used to reflect the anti-cracking performance of concrete. The smaller the ratio of compressive strength to flexural strength of concrete, the better the anti-cracking performance of concrete.

[0115] Table 2 performance test data table

[0116]

[0117] It can be seen from the combination of example 11 and comparative example 1 and table 2 that the addition of polypropylene fibers in concrete can reduce the slump, and it can be known that the polypropylene fibers form a three-dimensional network structure in the concrete, thereby increasing the bonding strength of each component of the concrete, reducing the slump of the concrete, and effectively improving the flexural strength of the concrete, although the compressive strength of the concrete decreases slightly, but effectively reduces the ratio of compressive strength to flexural strength, improves the anti-cracking performance of the concrete, and the concrete is less likely to crack.

[0118] It can be seen from the combination of example 10 and comparative example 11 and table 2 that the surface of the polypropylene fiber treated by acid and alkali forms grooves, which is beneficial to further improve the bonding strength of each component of the concrete, further improve the flexural strength of the concrete, thereby further reduce the ratio of compressive strength to flexural strength, improve the anti-cracking performance of the concrete, and reduce the cracking of the concrete.

[0119] It can be seen from the combination of example 9, example 10 and example 11 and table 2 that the mixed solution of tannic acid and polyethyleneimine forms a corresponding protective film on the surface of the modified fiber, improves the hydrophilicity of the anti-cracking agent, and is more conducive to the mixing of the anti-cracking agent with other components to play a role. The anti-cracking agent forms a three-dimensional network structure in the concrete, reducing the cracking of the concrete.

[0120] It can be seen from the combination of example 8, example 10 and example 11 and table 2 that the nano MOFs crystalline particles are formed on the surface of the modified fiber, thereby enhancing the strength of the modified fiber and changing the surface roughness of the modified fiber, so that the modified fiber can better mix with other components to form a three-dimensional network structure, reducing the cracking of the concrete.

[0121] It can be seen from the combination of Embodiments 2, 8, 9, 10 and 11 and Table 2 that the roughness of the polypropylene fiber surface is improved after acid and alkali treatment, thereby forming grooves for loading the reinforcing agent, and then forming nano MOFs crystalline particles on the modified fiber surface, thereby enhancing the strength of the modified fiber and changing the roughness of the modified fiber surface. The mixture solution of tannic acid and polyethyleneimine forms a corresponding protective film on the modified fiber surface loaded with the reinforcing agent, which improves the connection strength of the reinforcing agent on the modified fiber surface and improves the hydrophilicity of the anti-cracking agent, which is more conducive to the mixing of the anti-cracking agent with other components to play a role. The anti-cracking agent is dispersed in the concrete to form a three-dimensional network structure to reduce concrete cracking.

[0122] It can be seen from the combination of Embodiments 2, 6 and 7 and Table 2 that the water-reducing agent reduces the water consumption of the concrete, thereby reducing the water-binder ratio of the concrete, which is conducive to improving the strength of the concrete. The use of the expansive agent is conducive to compensating for the shrinkage of the concrete when the concrete shrinks, thereby reducing concrete cracking and the adverse effects caused by concrete cracking.

[0123] It can be seen from the combination of Embodiments 2, 4 and 5 and Table 2 that the mixed use of fly ash and mineral powder can promote the growth of the late strength of the concrete, improve the fluidity of the concrete, and thereby reduce the use of admixtures, so that the situation that the strength of the concrete decreases due to the increase in the amount of admixtures is improved.

[0124] It can be seen from the combination of Embodiments 1-3 and Table 2 that adjusting the addition amount of each component can have a significant effect on the performance of the concrete, thereby adjusting the compressive strength and flexural strength of the concrete, thereby changing the compression-flexure ratio, and thereby improving the cracking resistance of the concrete.

[0125] The specific embodiments are merely an explanation of the present application, and are not a limitation of the present application. Those skilled in the art can make modifications to the embodiments without creative contribution after reading the present specification, and the modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A process for the preparation of a crack resistant and wear resistant concrete, characterized in that, The method comprises the following steps: The cement, sand, admixture, anti-impact wear-resistant fluidizing agent and water are mixed in proportion, and then the gravel is added and mixed, finally the admixture and anti-cracking agent are added and mixed to obtain the concrete. The concrete comprises the following raw materials in parts by weight: 1100-1300 parts of gravel, 600-800 parts of sand, 250-350 parts of cement, 160-180 parts of water, 50-70 parts of admixture, 2-3 parts of admixture, 4-8 parts of anti-cracking agent and 7-11 parts of anti-impact wear-resistant fluidizing agent. The anti-cracking agent comprises modified fibers, a connecting agent and a reinforcing agent, the reinforcing agent is loaded on the modified fibers, the connecting agent is coated on the modified fibers loaded with the reinforcing agent, the modified fibers are polypropylene fibers treated by acid and alkali, the connecting agent is a mixed solution of tannic acid and polyethylene imine, and the reinforcing agent is nano MOFs crystalline particles.

2. The process for the preparation of anti-cracking and wear-resistant concrete according to claim 1, characterized in that, The admixture comprises fly ash and slag, and the weight ratio of the fly ash to the slag is 1:

1.

3. The process for preparing anti-cracking and wear-resistant concrete according to claim 1, characterized in that, The admixture comprises a water-reducing agent and an expanding agent, and the weight ratio of the water-reducing agent to the expanding agent is 1:

1.

4. The process for preparing a crack-resistant and wear-resistant concrete according to claim 1, characterized in that, The anti-cracking agent is prepared by the following steps: the modified fibers are first subjected to reinforcing treatment by the reinforcing agent, and then subjected to surface modification by the connecting agent, so as to obtain the anti-cracking agent.

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