CN113896483A - Anti-crack concrete and preparation method thereof - Google Patents
Anti-crack concrete and preparation method thereof Download PDFInfo
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- CN113896483A CN113896483A CN202111351390.3A CN202111351390A CN113896483A CN 113896483 A CN113896483 A CN 113896483A CN 202111351390 A CN202111351390 A CN 202111351390A CN 113896483 A CN113896483 A CN 113896483A
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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
- C04B28/02—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 hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- 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
- C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B16/04—Macromolecular compounds
- C04B16/06—Macromolecular compounds fibrous
- C04B16/0616—Macromolecular compounds fibrous from polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B16/0641—Polyvinylalcohols; Polyvinylacetates
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1051—Organo-metallic compounds; Organo-silicon compounds, e.g. bentone
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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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
Abstract
The invention provides anti-crack concrete and a preparation method thereof, belonging to the technical field of concrete and comprising the following components in parts by weight: 100-150 parts of water, 200-400 parts of cement, 30-50 parts of epoxy resin modified polypropylene fiber, 10-20 parts of reinforcing fiber, 9-14 parts of water reducing agent, 7-10 parts of expanding agent, 30-70 parts of fly ash, 30-70 parts of coarse aggregate, 20-50 parts of fine aggregate and 0.1-0.3 part of dioctyl sodium sulfosuccinate. In the anti-crack concrete, the modified polypropylene fibers are uniformly distributed in the concrete matrix, and the hydration reaction speed is improved by forming the fiber network structure, so that the anti-crack property and the impermeability of the concrete are obviously improved, and the strength of the concrete is increased.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to anti-crack concrete and a preparation method thereof.
Background
The concrete is a building material, along with social development, the usage amount of the concrete is larger and larger, the application field is wider and wider, the types of the concrete are more and more in order to meet the performance requirements of various application scenes, and the pervious high-strength asphalt concrete is commonly used in occasions needing water resistance and water blocking.
The common concrete has a large amount of capillary holes and fine cracks due to the structural characteristics of the common concrete, but the common concrete is not a completely compact structure, so the common concrete is easy to seep water and has poor impermeability.
The more the expanding agent is added into the concrete, the crack is reduced, and the impermeability is improved, but researches show that the compressive strength of the concrete is obviously reduced by adding the expanding agent into the concrete, so that the compressive strength of the pervious high-strength asphalt concrete is generally not high and is difficult to meet the requirements of special engineering, and therefore, the improvement space is provided.
Disclosure of Invention
The invention aims to provide anti-cracking concrete and a preparation method thereof.
The technical scheme of the invention is realized as follows:
the invention provides anti-crack concrete which comprises the following components in parts by weight: 100-150 parts of water, 200-400 parts of cement, 30-50 parts of epoxy resin modified polypropylene fiber, 10-20 parts of reinforcing fiber, 9-14 parts of water reducing agent, 7-10 parts of expanding agent, 30-70 parts of fly ash, 30-70 parts of coarse aggregate, 20-50 parts of fine aggregate and 0.1-0.3 part of dioctyl sodium sulfosuccinate.
As a further improvement of the invention, the epoxy resin modified polypropylene fiber is prepared by the following method:
s1, adding polypropylene fibers into an ethanol solution containing a silane coupling agent, heating to 70-90 ℃, reacting for 1-2h, filtering, and drying to obtain modified polypropylene fibers;
s2, heating, melting and blending the modified polypropylene fiber and the epoxy resin, reacting for 2-3h, and cooling to obtain the epoxy resin modified polypropylene fiber.
In a further improvement of the present invention, the silane coupling agent is an amino group-containing silane coupling agent and is at least one selected from the group consisting of γ -aminopropyltrimethoxysilane, γ -aminopropyltriethoxysilane, N- β (aminoethyl) - γ -aminopropyltrimethoxysilane, N- β (aminoethyl) - γ -aminopropyltriethoxysilane, N- β (aminoethyl) - γ -aminopropylmethyldimethoxysilane, N- β (aminoethyl) - γ -aminopropylmethyldiethoxysilane, and diethylenetriaminopropyltrimethoxysilane.
As a further improvement of the invention, the silane coupling agent is a compound mixture of gamma-aminopropyl trimethoxy silane and diethylenetriaminopropyl trimethoxy silane, and the mass ratio is 2: (1-4), preferably, 2: (2-3).
As a further improvement of the invention, the content of the silane coupling agent in the ethanol solution containing the silane coupling agent is 2-5 wt%; the melting temperature is 180-200 ℃.
As a further improvement of the invention, the mass ratio of the modified polypropylene fiber to the epoxy resin is 10: (3-5).
As a further improvement of the invention, the water reducing agent is at least one selected from a polycarboxylic acid water reducing agent, a naphthalene water reducing agent, a calcium lignosulfonate water reducing agent, a melamine water reducing agent and a melamine water reducing agent; the expanding agent is selected from at least one of calcium aluminate expanding agent, calcium oxide expanding agent, alunite expanding agent and sulphoaluminate expanding agent; the cement is portland cement.
As a further improvement of the invention, the coarse aggregate is crushed stone with the diameter of 10-20mm, and the fine aggregate is natural sand with the diameter of less than 5 mm.
As a further improvement of the invention, the reinforcing fiber is a mixture of polyvinyl alcohol fiber and polypropylene short fiber, and the mass ratio of the polyvinyl alcohol fiber to the polypropylene short fiber is 3: (3-5).
The invention further provides a preparation method of the anti-crack concrete, which comprises the following steps: adding coarse aggregate, fine aggregate and 20% of water into a stirrer, stirring for 10-20s, adding cement, dioctyl sodium sulfosuccinate and a water reducing agent, continuously stirring for 90-120s, adding epoxy resin modified polypropylene fiber, fly ash and reinforcing fiber, stirring for 70-100s, adding an expanding agent and the rest of water, stirring for 100-150s, discharging, pouring into a mold for molding, demolding and maintaining to obtain the anti-crack concrete.
The invention has the following beneficial effects: the epoxy resin modified polypropylene fiber prepared by the invention improves the surface adhesiveness of the polypropylene fiber, enhances the bonding effect between the polypropylene fiber and cement, and improves the toughness and strength of concrete as the polypropylene fiber forms a fiber film when the cement is hydrated. In addition, because the polypropylene fibers are uniformly distributed in the concrete, a fiber mesh structure which is distributed over the concrete matrix is formed, the mechanical property and durability of the concrete are effectively improved, and the impermeability and crack resistance of the concrete are improved.
The invention is additionally added with the reinforced fiber, the cost of the reinforced fiber is low, the mechanical property of the concrete can be obviously improved by adding the reinforced fiber into the concrete matrix, the reinforced fiber and the epoxy resin modified polypropylene fiber, the coarse aggregate, the fine aggregate and the like act together, the specific surface area of the epoxy resin modified polypropylene fiber is increased, the contact area of hydration reaction is increased, the speed of the hydration reaction is improved, the workability of the concrete is improved, the modified polypropylene fiber is uniformly distributed in the concrete, and the crack resistance of the concrete is improved.
The organic fiber added in the invention is a mixture of polyvinyl alcohol fiber and polyvinyl alcohol. The polypropylene short fibers are matched with the polyacrylonitrile fiber-based carbon fibers, so that the cement hydration is prolonged, the shrinkage rate of cement is reduced, the internal stress of concrete is integrally reduced, the risk of concrete cracking is reduced, and the mechanical property of the concrete is improved; polyvinyl alcohol fibers. The polyvinyl alcohol fiber is mainly characterized by high strength, high modulus, good wear resistance, acid and alkali resistance and weather resistance, and good affinity and binding property with base materials such as cement, gypsum and the like; the polyvinyl alcohol fiber is embedded in the concrete for a long time without going moldy, rotting or being damaged by worms, and can provide stable net rack support for the self-repairing agent. The addition of the two has the synergistic effect.
In the anti-crack concrete, the modified polypropylene fibers are uniformly distributed in the concrete matrix, and the hydration reaction speed is improved by forming the fiber network structure, so that the anti-crack property and the impermeability of the concrete are obviously improved, and the strength of the concrete is increased.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. 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.
Example 1
The raw materials comprise the following components in parts by weight: 100 parts of water, 200 parts of Portland cement, 30 parts of epoxy resin modified polypropylene fiber, 10 parts of reinforcing fiber, 9 parts of calcium lignosulfonate water reducing agent, 7 parts of calcium aluminate expanding agent, 30 parts of fly ash, 30 parts of coarse aggregate, 20 parts of fine aggregate and 0.1 part of dioctyl sodium sulfosuccinate. The coarse aggregate is crushed stone with the diameter of 10-20 mm; the fine aggregate is natural sand with the diameter less than 5 mm. The reinforced fiber is a mixture of polyvinyl alcohol fiber and polypropylene short fiber, and the mass ratio is 3: 3.
the epoxy resin modified polypropylene fiber is prepared by the following method:
s1, adding polypropylene fibers into an ethanol solution containing 2 wt% of silane coupling agent, heating to 70 ℃, reacting for 1 hour, filtering, and drying to obtain modified polypropylene fibers;
the silane coupling agent is a compound mixture of gamma-aminopropyl trimethoxy silane and diethylenetriaminopropyl trimethoxy silane, and the mass ratio is 1: 1.
s2, heating 100g of modified polypropylene fiber and 30g of epoxy resin to 180 ℃, melting and blending, reacting for 2 hours, and cooling to obtain the epoxy resin modified polypropylene fiber.
The preparation method of the anti-crack concrete comprises the following steps: adding coarse aggregate, fine aggregate and 20% of water into a stirrer, stirring for 10s, adding portland cement, dioctyl sodium sulfosuccinate and a calcium lignosulfonate water reducing agent, continuously stirring for 90s, adding epoxy resin modified polypropylene fiber, fly ash and reinforcing fiber, stirring for 70s, adding a calcium aluminate expanding agent and the rest of water, stirring for 100s, discharging, pouring into a mold for molding, demolding and maintaining to obtain the anti-crack concrete.
Example 2
The raw materials comprise the following components in parts by weight: 150 parts of water, 400 parts of Portland cement, 50 parts of epoxy resin modified polypropylene fiber, 20 parts of reinforcing fiber, 14 parts of naphthalene water reducer, 10 parts of sulphoaluminate expanding agent, 70 parts of fly ash, 70 parts of coarse aggregate, 50 parts of fine aggregate and 0.3 part of dioctyl sodium sulfosuccinate. The coarse aggregate is crushed stone with the diameter of 10-20 mm; the fine aggregate is natural sand with the diameter less than 5 mm. The reinforced fiber is a mixture of polyvinyl alcohol fiber and polypropylene short fiber, and the mass ratio is 3: 5.
the epoxy resin modified polypropylene fiber is prepared by the following method:
s1, adding polypropylene fibers into an ethanol solution containing 5 wt% of silane coupling agent, heating to 90 ℃, reacting for 2 hours, filtering, and drying to obtain modified polypropylene fibers;
the silane coupling agent is a compound mixture of gamma-aminopropyl trimethoxy silane and diethylenetriaminopropyl trimethoxy silane, and the mass ratio is 2: 3.
s2, heating 100g of modified polypropylene fiber and 30-50g of epoxy resin to 200 ℃, melting and blending, reacting for 3 hours, and cooling to obtain the epoxy resin modified polypropylene fiber.
The preparation method of the anti-crack concrete comprises the following steps: adding coarse aggregate, fine aggregate and 20% of water into a stirrer, stirring for 20s, adding portland cement, dioctyl sodium sulfosuccinate and a naphthalene water reducer, continuously stirring for 120s, adding epoxy resin modified polypropylene fiber, fly ash and reinforcing fiber, stirring for 100s, adding sulphoaluminate expanding agent and the rest of water, stirring for 150s, discharging, pouring into a mold for molding, demolding and maintaining to obtain the anti-crack concrete.
Example 3
The raw materials comprise the following components in parts by weight: 125 parts of water, 300 parts of Portland cement, 40 parts of epoxy resin modified polypropylene fiber, 15 parts of reinforcing fiber, 12 parts of polycarboxylic acid water reducing agent, 9 parts of alunite expanding agent, 50 parts of fly ash, 50 parts of coarse aggregate, 35 parts of fine aggregate and 0.2 part of dioctyl sodium sulfosuccinate. The coarse aggregate is crushed stone with the diameter of 10-20 mm; the fine aggregate is natural sand with the diameter less than 5 mm. The reinforced fiber is a mixture of polyvinyl alcohol fiber and polypropylene short fiber, and the mass ratio is 3: 4.
the epoxy resin modified polypropylene fiber is prepared by the following method:
s1, adding polypropylene fibers into an ethanol solution containing 3.5 wt% of silane coupling agent, heating to 80 ℃, reacting for 1.5h, filtering, and drying to obtain modified polypropylene fibers;
the silane coupling agent is a compound mixture of gamma-aminopropyl trimethoxy silane and diethylenetriaminopropyl trimethoxy silane, and the mass ratio is 2: 2.5.
s2, heating 100g of modified polypropylene fiber and 40g of epoxy resin to 190 ℃, melting and blending, reacting for 2.5 hours, and cooling to obtain the epoxy resin modified polypropylene fiber.
The preparation method of the anti-crack concrete comprises the following steps: adding coarse aggregate, fine aggregate and 20% of water into a stirrer, stirring for 15s, adding portland cement, dioctyl sodium sulfosuccinate and a polycarboxylic acid water reducing agent, continuing stirring for 100s, adding epoxy resin modified polypropylene fiber, fly ash and reinforcing fiber, stirring for 85s, adding an alunite expanding agent and the rest of water, stirring for 125s, discharging, pouring into a mold for molding, demolding and maintaining to obtain the anti-crack concrete.
Example 4
Compared with example 3, the silane coupling agent is gamma-aminopropyl trimethoxy silane, and other conditions are not changed.
Example 5
Compared with the embodiment 3, the silane coupling agent is diethylenetriaminopropyltrimethoxysilane, and other conditions are not changed.
Comparative example 1
Compared with example 3, the epoxy resin modified polypropylene fiber is replaced by the same amount of polypropylene fiber, and other conditions are not changed.
Comparative example 2
Compared with the example 3, the epoxy resin modified polypropylene fiber is not added, and other conditions are not changed.
The raw materials comprise the following components in parts by weight: 125 parts of water, 300 parts of Portland cement, 55 parts of reinforcing fiber, 12 parts of polycarboxylic acid water reducing agent, 9 parts of alunite expanding agent, 50 parts of fly ash, 50 parts of coarse aggregate, 35 parts of fine aggregate and 0.2 part of dioctyl sodium sulfosuccinate.
Comparative example 3
Compared with example 3, no reinforcing fiber was added, and other conditions were not changed.
The raw materials comprise the following components in parts by weight: 125 parts of water, 300 parts of Portland cement, 55 parts of epoxy resin modified polypropylene fiber, 12 parts of polycarboxylic acid water reducing agent, 9 parts of alunite expanding agent, 50 parts of fly ash, 50 parts of coarse aggregate, 35 parts of fine aggregate and 0.2 part of dioctyl sodium sulfosuccinate.
Test example 1 crack resistance test
The anti-crack concretes prepared in examples 1 to 5 of the present invention and comparative examples 1 to 3 were subjected to anti-crack performance tests, and the results are shown in table 1.
1. Compressive strength and flexural strength: detecting according to GB/T50107-2010 concrete strength test evaluation standard;
2. splitting strength: testing according to JTGE30-2005 test Specification for road engineering cement and cement concrete;
3. flexural tensile strength and flexural tensile modulus: the test was carried out according to JTGE30-2003 test procedures for road engineering cement and cement concrete.
TABLE 1
Test example 2 impermeability test
Anti-permeability performance: the test is carried out according to GB/T50082-2009 test method standard for long-term performance and durability of common concrete, the osmotic pressure is 3.5MPa, and the pressurizing time is 48 h.
The crack-resistant concretes prepared in examples 1 to 5 of the present invention and comparative examples 1 to 3 were subjected to the impermeability test, and the results are shown in table 2.
TABLE 2
| Group of | 28d Water penetration height/mm | Grade of impermeability |
| Example 1 | 1.02 | Greater than P12 |
| Example 2 | 0.95 | Greater than P12 |
| Example 3 | 0.90 | Greater than P12 |
| Example 4 | 1.05 | Greater than P12 |
| Example 5 | 1.07 | Greater than P12 |
| Comparative example 1 | 1.57 | P12 |
| Comparative example 2 | 2.25 | P12 |
| Comparative example 3 | 1.05 | Greater than P12 |
Test example 3
The crack resistant concretes prepared in examples 1 to 5 of the present invention and comparative examples 1 to 3 were subjected to a performance test, and the results are shown in table 3.
28d drying shrinkage test: the test is carried out according to GB/T50082-2009 Standard test method for long-term performance and durability of common concrete.
Slump: the test is carried out according to GB/T50080-2002 'common concrete mixture performance test standard'.
TABLE 3
From the above table, it can be seen that the anti-crack concrete prepared by the invention has large slump, small slump loss rate, good 28-day compressive strength, 28-day breaking strength, cleavage strength and the like, small water seepage height and few 28-day drying shrinkage tests, and the anti-crack concrete prepared by the examples 1 to 3 has strong anti-crack performance and anti-permeability performance.
Compared with the example 3, the silane coupling agent is single gamma-aminopropyl trimethoxy silane or diethylenetriaminopropyl trimethoxy silane, so that the bonding between the epoxy resin and the modified polypropylene fiber is less, the bonding effect between the prepared epoxy resin modified polypropylene fiber and cement is reduced, and the toughness and the strength of concrete are reduced.
Compared with the example 3, the polypropylene fiber with the same quantity replaces the epoxy resin modified polypropylene fiber, the mechanical property and the anti-permeability performance of the polypropylene fiber are reduced, the polypropylene fiber forms a network structure in concrete, but the bonding effect with cement is reduced, the polypropylene fiber is unevenly distributed in the concrete, so that the mechanical property and the durability of the concrete are reduced, and the anti-permeability performance and the anti-cracking performance of the concrete are reduced.
Compared with the embodiment 3, the concrete prepared by the comparative example 2 and the comparative example 3 are obviously reduced in mechanical property and impermeability because epoxy resin modified polypropylene fibers or reinforcing fibers are not added respectively, the adhesion of the surfaces of the polypropylene fibers is improved due to the epoxy resin modified polypropylene fibers, the bonding effect of the polypropylene fibers and cement is enhanced, and the polypropylene fibers form fiber films when the cement is hydrated, so that the toughness and strength of the concrete are improved. In addition, because the polypropylene fibers are uniformly distributed in the concrete, a fiber mesh structure which is distributed over the concrete matrix is formed, the mechanical property and the durability of the concrete are effectively improved, the anti-permeability performance and the anti-cracking performance of the concrete are improved, the mechanical property of the concrete can be obviously improved by adding the reinforcing fibers into the concrete matrix, the reinforcing fibers and the epoxy resin modified polypropylene fibers, coarse aggregates, fine aggregates and the like act together, the specific surface area of the epoxy resin modified polypropylene fibers is increased, the contact area of hydration reaction is increased, the hydration reaction speed is increased, the workability of the concrete is improved, the modified polypropylene fibers are uniformly distributed in the concrete, the anti-cracking performance of the concrete is improved, and the reinforcing fibers and the epoxy resin modified polypropylene fibers have a synergistic effect.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The anti-crack concrete is characterized by comprising the following components in parts by weight: 100-150 parts of water, 200-400 parts of cement, 30-50 parts of epoxy resin modified polypropylene fiber, 10-20 parts of reinforcing fiber, 9-14 parts of water reducing agent, 7-10 parts of expanding agent, 30-70 parts of fly ash, 30-70 parts of coarse aggregate, 20-50 parts of fine aggregate and 0.1-0.3 part of dioctyl sodium sulfosuccinate.
2. The crack-resistant concrete according to claim 1, wherein the epoxy resin modified polypropylene fiber is prepared by the following method:
s1, adding polypropylene fibers into an ethanol solution containing a silane coupling agent, heating to 70-90 ℃, reacting for 1-2h, filtering, and drying to obtain modified polypropylene fibers;
s2, heating, melting and blending the modified polypropylene fiber and the epoxy resin, reacting for 2-3h, and cooling to obtain the epoxy resin modified polypropylene fiber.
3. The crack-resistant concrete according to claim 2, wherein the silane coupling agent is an amino-containing silane coupling agent selected from at least one of γ -aminopropyltrimethoxysilane, γ -aminopropyltriethoxysilane, N- β (aminoethyl) - γ -aminopropyltrimethoxysilane, N- β (aminoethyl) - γ -aminopropyltriethoxysilane, N- β (aminoethyl) - γ -aminopropylmethyldimethoxysilane, N- β (aminoethyl) - γ -aminopropylmethyldiethoxysilane, and diethylenetriaminopropyltrimethoxysilane.
4. The anti-crack concrete according to claim 3, wherein the silane coupling agent is a compound mixture of gamma-aminopropyltrimethoxysilane and diethylenetriaminopropyltrimethoxysilane, and the mass ratio of the silane coupling agent to the diethylenetriaminopropyltrimethoxysilane is 2: (1-4), preferably, 2: (2-3).
5. The crack-resistant concrete according to claim 2, wherein the content of the silane coupling agent in the ethanol solution containing the silane coupling agent is 2-5 wt%; the melting temperature is 180-200 ℃.
6. The crack-resistant concrete according to claim 2, wherein the mass ratio of the modified polypropylene fibers to the epoxy resin is 10: (3-5).
7. The anti-crack concrete according to claim 1, wherein the water reducing agent is at least one selected from the group consisting of polycarboxylic acid water reducing agents, naphthalene water reducing agents, calcium lignosulfonate water reducing agents, melamine water reducing agents and melamine water reducing agents; the expanding agent is selected from at least one of calcium aluminate expanding agent, calcium oxide expanding agent, alunite expanding agent and sulphoaluminate expanding agent; the cement is portland cement.
8. The crack-resistant concrete according to claim 1, wherein the coarse aggregate is crushed stone having a diameter of 10-20 mm; the fine aggregate is natural sand with the diameter less than 5 mm.
9. The crack-resistant concrete according to claim 1, wherein the reinforcing fibers are a mixture of polyvinyl alcohol fibers and polypropylene short fibers, and the mass ratio of the polyvinyl alcohol fibers to the polypropylene short fibers is 3: (3-5).
10. A method for preparing a crack resistant concrete according to any one of claims 1 to 9, comprising the steps of: adding coarse aggregate, fine aggregate and 20% of water into a stirrer, stirring for 10-20s, adding cement, dioctyl sodium sulfosuccinate and a water reducing agent, continuously stirring for 90-120s, adding epoxy resin modified polypropylene fiber, fly ash and reinforcing fiber, stirring for 70-100s, adding an expanding agent and the rest of water, stirring for 100-150s, discharging, pouring into a mold for molding, demolding and maintaining to obtain the anti-crack concrete.
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