CN110950603A - High-strength anti-crack concrete and preparation method thereof - Google Patents
High-strength anti-crack concrete and preparation method thereof Download PDFInfo
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- CN110950603A CN110950603A CN201911302714.7A CN201911302714A CN110950603A CN 110950603 A CN110950603 A CN 110950603A CN 201911302714 A CN201911302714 A CN 201911302714A CN 110950603 A CN110950603 A CN 110950603A
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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
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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
- 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
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Abstract
The invention relates to high-strength anti-crack concrete and a preparation method thereof. The concrete comprises the following components in parts by weight: 500 portions of 460-doped cement, 40-60 portions of fly ash, 30-50 portions of silica fume, 1150 portions of 1050-doped coarse aggregate, 600 portions of 580-doped fine aggregate, 160 portions of 140-doped modified waste ABS plastic particles, 40-60 portions of modified zeolite powder, 0.5-0.9 portion of polypropylene fiber, 15.4-17.1 portions of polycarboxylic acid water reducing agent and 0.20-0.25 water-to-glue ratio. The high-strength anti-cracking concrete provided by the invention has the advantages of small internal shrinkage stress, high overall strength, obvious shrinkage reducing effect, excellent anti-cracking performance, simple preparation method, cheap and easily available raw materials, utilization of waste materials and high environmental protection benefit.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to high-strength anti-crack concrete and a preparation method thereof.
Background
The high-strength concrete has high compressive strength, high density and low porosity, and is widely applied to high-rise building structures, large-span bridge structures and certain special structures. However, high-strength concrete has large early self-shrinkage and later drying shrinkage, is easy to crack, and is generally solved by matching an internal curing agent, an expanding agent, anti-cracking fibers and the like in order to reduce the shrinkage of the high-strength concrete and maximize the hydration degree of a cementing material, but the expanding agent serving as an important additive needs to adjust the mixing amount and the mixing ratio according to the difference of the development of the strength of the concrete, so that the control difficulty is large.
Shrinkage reducing agents are also commonly added into high-strength concrete to reduce internal stress by reducing the surface tension of capillary channels, so as to achieve the purpose of improving the cracking resistance of the concrete, but the shrinkage reducing agents are generally organic substances, and the surfactant is easy to influence the hydration of early-stage cementing materials and cause certain negative effects on the performance of the concrete.
The ABS resin has excellent impact resistance, heat resistance, low temperature resistance and other performance, and has elastic modulus smaller than that of sandstone aggregate, so that waste ABS product results in great waste. However, related researches show that the hydration is insufficient and the cementing strength is low at the interface between the plastic particles and the set cement.
Disclosure of Invention
The invention aims to provide high-strength anti-cracking concrete and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the high-strength anti-crack concrete comprises the following components in parts by weight:
460 and 500 portions of cement;
40-60 parts of fly ash;
30-50 parts of silica fume;
1050 portions of coarse aggregate and 1150 portions;
580 portions of fine aggregate;
140-160 parts of modified waste ABS plastic particles;
40-60 parts of modified zeolite powder
0.5-0.9 part of polypropylene fiber;
15.4-17.1 parts of a polycarboxylic acid water reducing agent;
the water-to-glue ratio is 0.20-0.25; wherein:
the modified waste ABS plastic particles are obtained by modifying waste ABS plastic spherical particles with organic polymer water-absorbent resin micro powder;
the modified zeolite powder is obtained by modifying zeolite powder by using a mixed aqueous solution of dipropylene glycol and polycarboxylic acid containing vinyl glycol branched chains.
According to the scheme, the preparation of the modified waste ABS plastic particles comprises the following steps: and (2) carrying out micropore processing on the waste ABS plastic spherical particles, then fully and mechanically mixing the waste ABS plastic spherical particles with the organic polymer water-absorbent resin micro powder, and standing the mixture for 20-24 hours at normal temperature in an environment with the humidity of 75-95% to obtain the modified waste ABS plastic particles.
According to the scheme, the diameter of the ABS plastic spherical particles is 3.5-4.5 mm; the size of the organic polymer water-absorbent resin micro-powder is 400-600 meshes.
According to the scheme, the organic polymer water-absorbing resin is sodium polyacrylate, and the polymerization degree is 2200-3000.
According to the scheme, the number of micropores obtained after the processing of the micropores of the ABS plastic spherical particles is 6-10, the aperture of the micropores is 0.3-0.5mm, and the depth of the micropores is 0.7-0.9 mm.
According to the scheme, the modified zeolite powder is prepared by the following steps: adding the zeolite powder into a mixed aqueous solution of dipropylene glycol and polycarboxylic acid containing vinyl glycol branched chains, uniformly mixing, and sealing at normal temperature for 48-52h to obtain the modified zeolite powder.
According to the scheme, the mass ratio of the dipropylene glycol to the polycarboxylic acid containing vinyl glycol branched chains is 1: (1-3); the mass concentration of the mixed aqueous solution of the dipropylene glycol and the polycarboxylic acid containing vinyl glycol branched chains is 30-40%; the mass ratio of the zeolite powder to the mixed aqueous solution of dipropylene glycol and polycarboxylic acid containing vinyl glycol branches is (5-7): 1.
According to the scheme, the particle size of the zeolite powder is 200-400 meshes.
According to the scheme, the polypropylene fiber is a bundle-shaped net fiber with the aperture of 9-16mm2The diameter of the fiber is 22-26 μm, and the length is 16-19 mm.
According to the scheme, the cement is ordinary portland cement with the strength of more than or equal to 42.5 MPa.
According to the scheme, the fly ash is ultrafine fly ash, and the average particle size is 2.7-3.1 mu m.
According to the scheme, the specific surface area of the silica fume is more than or equal to 20000m2Per kg, average particle diameter of 0.14-0.21 μm.
According to the scheme, the coarse aggregate is 5-25mm continuous graded crushed stone.
According to the scheme, the fine aggregate is natural river sand with fineness modulus of 2.5-2.8.
According to the scheme, the water reducing rate of the polycarboxylic acid water reducing agent is 28-30%.
The preparation method of the high-strength anti-crack concrete comprises the following specific steps:
(1) mixing and stirring 500 parts of 460-doped cement, 40-60 parts of fly ash, 30-50 parts of silica fume, 1150 parts of 1050-doped coarse aggregate, 600 parts of 580-doped fine aggregate, 40-60 parts of modified zeolite powder and 0.5-0.9 part of polypropylene fiber for 2-3 min;
(2) adding water and 15.4-17.1 parts of polycarboxylic acid water reducing agent into the mixture obtained in the step (1), and continuously stirring for 5-7min, wherein the water-to-glue ratio is 0.20-0.25;
(3) adding 140-160 parts of modified waste ABS plastic particles into the mixture obtained in the step (2), and continuously stirring for 3-5 min;
(4) and (3) forming at normal temperature, removing the mold for 24 hours, and performing standard curing for 28 days to obtain the high-strength anti-crack concrete.
In the high-strength anti-cracking concrete provided by the invention, the anti-cracking performance and the overall strength of the high-strength concrete are improved by utilizing the modified waste ABS plastic particles, the polypropylene fibers and the modified zeolite powder.
In the modified waste ABS plastic particles, the organic high-molecular water-absorbent resin exists in micropores of the ABS plastic particles in a water-retaining state, and in high-strength concrete, the organic high-molecular water-absorbent resin partially loses water, so that the cementing materials near the waste ABS plastic particles are fully hydrated, the self-shrinkage and drying shrinkage stress are reduced, and the cracking risk is reduced; the elastic modulus of the ABS plastic particles is higher, but is smaller than that of hardened cement, and the micro deformation of the ABS plastic particles can reduce partial stress in concrete at the later stage of hydration and hardening of the cementing material, so that the cracking risk is further reduced. In addition, the full hydration of the cementing material near the cement stone modified waste ABS particle ceramsite also enhances the acting force between the cement stone and the modified waste ABS particles, the internal structure becomes more compact, and the overall strength is improved.
The shrinkage reducing agent dipropyl glycol and polycarboxylic acid containing vinyl glycol branched chain have the shrinkage reducing function, but are directly added into concrete, and are not beneficial to early hydration of gel material, and said invention utilizes the modification process to fix dipropyl glycol, branched chain containing vinyl glycol and partial water in the zeolite powder, the modified zeolite powder is obtained, water and dipropyl glycol and polycarboxylic acid containing vinyl glycol branched chains are slowly released along with the development of the strength of the concrete, the hydration of the cementing material is promoted by the water, the dipropyl glycol and the polycarboxylic acid containing the vinyl glycol branched chains reduce the capillary tension of a cement stone pore channel, the risk of cracking the concrete is reduced, meanwhile, the slow release of the shrinkage reducing agent reduces the influence of the shrinkage reducing agent on the early hydration of the gelled material, and in addition, under the action of water, the shrinkage reducing agent is diffused more quickly, so that a better shrinkage reducing effect is achieved, and the anti-cracking performance of the concrete is enhanced.
With the stirring and mixing of the aggregate, the powder and the like, the polypropylene fiber is distributed in the whole system in a spatial net shape under the mechanical action, under the random action, the net-shaped fiber meshes are bound to be embedded with the inherent hydrated set cement, and coarse and fine aggregate or plastic particles are possibly embedded in the net-shaped fiber meshes, so that the acting force between the set cement and the set cement, between the set cement and the aggregate and between the aggregate and the aggregate at the later stage is enhanced under the constraint of the net-shaped fiber, the risk of cracking inside the concrete is reduced, and the modified ABS plastic particles and the modified zeolite powder are mutually supplemented and perfected, so that a complete anti-cracking system is formed.
The technical scheme of the invention has the beneficial effects that:
1. in the high-strength anti-crack concrete provided by the invention, the modified waste ABS plastic particles, the polypropylene fasciculate net fibers and the modified zeolite powder form a complete anti-crack system, wherein the hydration reaction of the modified waste ABS plastic particles and a cement stone interface is sufficient, the self-shrinkage and drying shrinkage stress is reduced, the overall strength is improved, the internal stress is reduced by the micro-deformation of the ABS plastic, and the shrinkage and cracking are reduced; the modified zeolite powder reduces the influence of the shrinkage reducing agent dipropyl glycol and the polycarboxylic acid containing vinyl glycol branched chains on the early hydration of the gelled material, and improves the internal hydration and shrinkage reducing effect of concrete; the polypropylene fiber improves the effects between the aggregate and the aggregate, between the aggregate and the set cement and between the set cement and the set cement, and reduces the risk of internal cracking; the obtained concrete has small internal shrinkage stress, high integral strength, obvious shrinkage reducing effect and excellent crack resistance.
2. The high-strength anti-cracking concrete provided by the invention is simple in preparation method, cheap and easily available in raw materials, and utilizes a large amount of waste ABS plastics, so that the waste of resources is reduced, and certain economic and environmental benefits are generated.
Detailed Description
The present invention is further described below with reference to specific examples to facilitate the understanding of those skilled in the art.
Example 1
The invention provides light-weight ultrahigh-strength concrete and a preparation method thereof.
The high-strength anti-crack concrete comprises the following raw materials in parts by weight:
460 parts of general portland cement;
50 parts of fly ash;
40 parts of silica fume;
1050 parts of coarse aggregate;
580 parts of fine aggregate;
140 parts of modified waste ABS plastic particles;
50 portions of modified zeolite powder
0.6 part of polypropylene fiber;
15.5 parts of a polycarboxylic acid water reducing agent;
water-to-glue ratio, 0.25.
Wherein:
the Portland cement is ordinary Portland cement with the strength of 42.5 MPa.
The fly ash is ultra-fine fly ash with the average particle size of 2.7 mu m.
The specific surface area of the silica fume is more than or equal to 20000m2Kg, average particle size 0.14 μm.
The coarse aggregate is 5-25mm continuous graded broken stone.
The fine aggregate is natural river sand with fineness modulus of 2.5.
The polypropylene fiber is bundle-shaped net fiber with the aperture of 9mm2The diameter of the fiber is 22 μm, and the length is 16 mm.
The water reducing rate of the polycarboxylic acid water reducing agent is 28 percent.
The preparation of the modified waste ABS plastic particles comprises the following steps: the method comprises the steps of firstly decontaminating, cleaning and drying the waste ABS plastic, granulating the waste ABS plastic into spherical particles with the diameter of 3.5mm, then carrying out micropore processing on the particles, wherein the number of pores is 6, the particles are uniformly distributed on the surfaces of the particles, the pore diameter is 0.5mm, the pore depth is 0.7mm, then fully and mechanically mixing the particles with 400-mesh organic polymer water-absorbent resin micro powder to fill the micropores of the spherical particles with the micro powder, then keeping the micro powder in a normal temperature and 95% humidity environment for 24 hours, and then screening the redundant resin micro powder on the surfaces of the particles to obtain the modified waste ABS plastic particles, wherein the organic polymer water-absorbent resin micro powder is sodium polyacrylate and the.
The preparation of the modified zeolite powder comprises the following steps: using deionized water to mix dipropylene glycol and polycarboxylic acid containing vinyl glycol branched chains according to a mass ratio of 1: 2 preparing a mixed aqueous solution with the concentration of 30 percent, then uniformly mixing the 400-mesh zeolite powder and the prepared mixed aqueous solution in a mass ratio of 5:1, and then sealing the mixture for 48 hours at normal temperature to obtain the modified zeolite powder.
The preparation method of the high-strength anti-crack concrete comprises the following specific steps:
(1) 460 parts of general portland cement, 50 parts of fly ash, 40 parts of silica fume, 1050 parts of coarse aggregate, 580 parts of fine aggregate, 50 parts of modified zeolite powder and 0.6 part of polypropylene fiber are mixed and stirred for 2 min.
(2) Adding water and 15.5 parts of polycarboxylic acid water reducing agent into the mixture obtained in the step (1), and continuing stirring for 5min, wherein the water-to-gel ratio is 0.25;
(3) and (3) adding 140-160 parts of modified waste ABS plastic particles into the mixture obtained in the step (2), and continuing stirring for 3 min.
(4) And (3) forming at normal temperature, removing the mold for 24 hours, and performing standard curing for 28 days to obtain the high-strength anti-crack concrete.
Example 2
Provides a light ultra-high strength concrete and a preparation method thereof.
The high-strength anti-crack concrete comprises the following raw materials in parts by weight:
480 parts of general portland cement;
60 parts of fly ash;
50 parts of silica fume;
1050 parts of coarse aggregate;
590 parts of fine aggregate;
150 parts of modified waste ABS plastic particles;
60 portions of modified zeolite powder
0.7 part of polypropylene fiber;
16.2 parts of a polycarboxylic acid water reducing agent;
water-to-glue ratio, 0.23.
Wherein:
the Portland cement is ordinary Portland cement with the strength of 42.5 MPa.
The fly ash is ultra-fine fly ash with the average particle size of 2.9 mu m.
The specific surface area of the silica fume is more than or equal to 20000m2Kg, average particle size 0.17 μm.
The coarse aggregate is 5-25mm continuous graded broken stone.
The fine aggregate is natural river sand with fineness modulus of 2.6.
The polypropylene fiber is bundle-shaped net fiber with the aperture of 16mm2The diameter of the fiber is 24 μm, and the length is 18 mm.
The water reducing rate of the polycarboxylic acid water reducing agent is 29 percent.
The preparation of the modified waste ABS plastic particles comprises the following steps: the method comprises the steps of firstly decontaminating, cleaning and drying the waste ABS plastic, granulating the waste ABS plastic into spherical particles with the diameter of 4.0mm, then carrying out micropore processing on the particles, wherein the number of pores is 8, the particles are uniformly distributed on the surfaces of the particles, the pore diameter is 0.5mm, the pore depth is 0.8mm, then fully and mechanically mixing the particles with 600-mesh organic polymer water-absorbent resin micro powder to fill the micropores of the spherical particles with the micro powder, then keeping the micro powder in the environment with normal temperature and 95% humidity for 24 hours, and then screening the redundant resin micro powder on the surfaces of the particles to obtain the modified waste ABS plastic particles, wherein the organic polymer water-absorbent resin is sodium polyacrylate and the polymerization degree is.
The preparation of the modified zeolite powder comprises the following steps: using deionized water to mix dipropylene glycol and polycarboxylic acid containing vinyl glycol branched chains according to a mass ratio of 1: 2.5 preparing a mixed aqueous solution with the concentration of 35 percent, then uniformly mixing the 300-mesh zeolite powder and the prepared mixed aqueous solution in a mass ratio of 5:1, and then carrying out plastic sealing for 48 hours at normal temperature to obtain the modified zeolite powder.
The preparation method of the high-strength anti-crack concrete comprises the following specific steps:
(1) 480 parts of general portland cement, 60 parts of fly ash, 50 parts of silica fume, 1050 parts of coarse aggregate, 590 parts of fine aggregate, 60 parts of modified zeolite powder and 0.7 part of polypropylene fiber are mixed and stirred for 3 min.
(2) Adding water and 16.2 parts of polycarboxylic acid water reducing agent into the mixture obtained in the step (1), and continuing stirring for 6min, wherein the water-to-glue ratio is 0.23;
(3) and (3) adding 140-160 parts of modified waste ABS plastic particles into the mixture obtained in the step (2), and continuing stirring for 4 min.
(4) And (3) forming at normal temperature, removing the mold for 24 hours, and performing standard curing for 28 days to obtain the high-strength anti-crack concrete.
Example 3
The invention provides light-weight ultrahigh-strength concrete and a preparation method thereof.
The high-strength anti-crack concrete comprises the following raw materials in parts by weight:
500 parts of general portland cement;
60 parts of fly ash;
50 parts of silica fume;
1150 parts of coarse aggregate;
580 parts of fine aggregate;
160 parts of modified waste ABS plastic particles;
50 portions of modified zeolite powder
0.8 part of polypropylene fiber;
16.9 parts of a polycarboxylic acid water reducing agent;
water-to-glue ratio, 0.20.
Wherein:
the Portland cement is ordinary Portland cement with the strength of 42.5 MPa.
The fly ash is ultrafine fly ash with the average particle size of 3.1 mu m.
The specific surface area of the silica fume is more than or equal to 20000m2Kg, average particle size 0.19 μm.
Coarse aggregate and 5-25mm continuous graded broken stone.
The fine aggregate is natural river sand with fineness modulus of 2.8.
The polypropylene fiber is bundle-shaped net fiber with the aperture of 16mm2The diameter of the fiber is 24 μm, and the length is 18 mm.
The water reducing rate of the polycarboxylic acid water reducing agent is 30 percent.
The preparation of the modified waste ABS plastic particles comprises the following steps: the method comprises the steps of firstly decontaminating, cleaning and drying the waste ABS plastic, granulating the waste ABS plastic into spherical particles with the diameter of 4.5mm, then carrying out micropore processing on the particles, wherein the number of the pores is 10, the particles are uniformly distributed on the surfaces of the particles, the pore diameter is 0.5mm, the pore depth is 0.9mm, then fully and mechanically mixing the particles with 600-mesh organic polymer water-absorbent resin micro powder to fill the micropores of the spherical particles with the micro powder, then keeping the micro powder in the environment with normal temperature and 95% humidity for 24 hours, and then screening the redundant resin micro powder on the surfaces of the particles to obtain the modified waste ABS plastic particles, wherein the organic polymer water-absorbent resin is sodium polyacrylate and the polymerization.
The preparation of the modified zeolite powder comprises the following steps: using deionized water to mix dipropylene glycol and polycarboxylic acid containing vinyl glycol branched chains according to a mass ratio of 1: 3 preparing aqueous solution with the concentration of 40 percent, then evenly mixing the zeolite powder with 200 meshes with the prepared aqueous solution according to the mass ratio of 5:1, and then carrying out plastic sealing for 48 hours at normal temperature to obtain the modified zeolite powder.
The preparation method of the high-strength anti-crack concrete comprises the following specific steps:
(1) 500 parts of general portland cement, 60 parts of fly ash, 50 parts of silica fume, 1150 parts of coarse aggregate, 580 parts of fine aggregate, 50 parts of modified zeolite powder and 0.8 part of polypropylene fiber are mixed and stirred for 3 min.
(2) Adding water and 16.9 parts of polycarboxylic acid water reducing agent into the mixture obtained in the step (1), and continuing stirring for 7min, wherein the water-to-gel ratio is 0.20;
(3) and (3) adding 140-160 parts of modified waste ABS plastic particles into the mixture obtained in the step (2), and continuing stirring for 5 min.
(4) And (3) forming at normal temperature, removing the mold for 24 hours, and performing standard curing for 28 days to obtain the high-strength anti-crack concrete.
Comparative example 1
The common high-strength concrete comprises the following raw materials in parts by weight:
460 parts of general portland cement; 100 parts of fly ash; 40 parts of silica fume; 1050 parts of coarse aggregate; 720 parts of fine aggregate; 13.4 parts of a polycarboxylic acid water reducing agent; water-to-glue ratio, 0.25.
The rest is the same as example 1.
Comparative example 2
The common high-strength concrete comprises the following raw materials in parts by weight:
480 parts of general portland cement; 120 parts of fly ash; 50 parts of silica fume; 1050 parts of coarse aggregate; 740 parts of fine aggregate; 14.8 parts of a polycarboxylic acid water reducing agent; water-to-glue ratio, 0.23.
The rest is the same as example 2.
Comparative example 3
The common high-strength concrete comprises the following raw materials in parts by weight:
500 parts of general portland cement; 110 parts of fly ash; 50 parts of silica fume; 1150 parts of coarse aggregate; 740 parts of fine aggregate; 15.6 parts of a polycarboxylic acid water reducing agent; water-to-glue ratio, 0.20.
The rest is the same as example 3.
The high-strength anti-crack concrete prepared in examples 1 to 3 and the common high-strength concrete prepared in comparative examples 1 to 3 were measured for tensile strength, ultimate tensile strain, bending strength, deflection corresponding to peak load, compressive strength, and ultimate compressive strain according to the method of GB/T50081-2019, and the specific results are shown in Table 1.
TABLE 1 high-strength anti-crack concrete performance test table
Research shows that the better the tensile strength, ultimate tensile strain, bending strength, deflection corresponding to peak load, compressive strength and ultimate compressive strain performance are, the better the crack resistance is. The results in table 1 show that the strain and strength of examples 1 to 3 are improved correspondingly compared with those of comparative examples 1 to 3, which shows that the crack resistance of the high-strength crack-resistant concrete obtained in examples 1 to 3 is greatly improved and the crack resistance is better than that of the common high-strength concrete obtained in comparative examples 1 to 3.
It is apparent that the above embodiments are only examples for clearly illustrating and do not limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications are therefore intended to be included within the scope of the invention as claimed.
Claims (10)
1. The high-strength anti-crack concrete is characterized by comprising the following components in parts by weight:
460 and 500 portions of cement;
40-60 parts of fly ash;
30-50 parts of silica fume;
1050 portions of coarse aggregate and 1150 portions;
580 portions of fine aggregate;
140-160 parts of modified waste ABS plastic particles;
40-60 parts of modified zeolite powder
0.5-0.9 part of polypropylene fiber;
15.4-17.1 parts of a polycarboxylic acid water reducing agent;
the water-to-glue ratio is 0.20-0.25; wherein:
the modified waste ABS plastic particles are obtained by modifying waste ABS plastic spherical particles with organic polymer water-absorbent resin micro powder;
the modified zeolite powder is obtained by modifying zeolite powder by using a mixed aqueous solution of dipropylene glycol and polycarboxylic acid containing vinyl glycol branched chains.
2. The high strength crack-resistant concrete according to claim 1, wherein the preparation of the modified waste ABS plastic particles is carried out by: and (2) carrying out micropore processing on the waste ABS plastic spherical particles, then fully and mechanically mixing the waste ABS plastic spherical particles with the organic polymer water-absorbent resin micro powder, and standing the mixture for 20-24 hours at normal temperature in an environment with the humidity of 75-95% to obtain the modified waste ABS plastic particles.
3. The high strength crack-resistant concrete according to claim 1 or 2, wherein the diameter of the ABS plastic spherical particles is 3.5-4.5 mm; the size of the organic polymer water-absorbent resin micro-powder is 400-600 meshes.
4. The high-strength anti-cracking concrete according to claim 1 or 2, wherein the organic polymer water-absorbing resin is sodium polyacrylate, and the degree of polymerization is 2200-3000.
5. The high-strength anti-crack concrete according to claim 2, wherein the number of micropores obtained after the processing of the micropores of the ABS plastic spherical particles is 6-10, the aperture of the micropores is 0.3-0.5mm, and the depth of the micropores is 0.7-0.9 mm.
6. The high-strength anti-crack concrete according to claim 1, wherein the modified zeolite powder is prepared by: adding the zeolite powder into a mixed aqueous solution of dipropylene glycol and polycarboxylic acid containing vinyl glycol branched chains, uniformly stirring, and sealing at normal temperature for 48-52h to obtain the modified zeolite powder.
7. The high strength, crack resistant concrete according to claim 1 or 6, wherein the mass ratio of the dipropylene glycol to the polycarboxylic acid containing vinyl glycol branches is 1: (1-3); the mass concentration of the mixed aqueous solution of the dipropylene glycol and the polycarboxylic acid containing vinyl glycol branched chains is 30-40%; the mass ratio of the zeolite powder to the mixed aqueous solution of the dipropylene glycol and the polycarboxylic acid containing vinyl glycol branched chains is (5-7) to 1; the particle size of the zeolite powder is 200-400 meshes.
8. The high strength crack-resistant concrete according to claim 1, wherein the polypropylene fibers are bundle-like net fibers with a pore size of 9-16mm2The diameter of the fiber is 22-26 μm, and the length is 16-19 mm.
9. The high-strength anti-cracking concrete according to claim 1, wherein the cement is ordinary portland cement with the strength of more than or equal to 42.5 MPa; the fly ash is ultrafine fly ash, and the average particle size is 2.7-3.1 mu m; the specific surface area of the silica fume is more than or equal to 20000m2Kg, average grain diameter of 0.14-0.21 μm; the coarse aggregate is 5-25mm continuous graded broken stone; the fine aggregate is natural river sand with fineness modulus of 2.5-2.8; the water reducing rate of the polycarboxylic acid water reducing agent is 28-30%.
10. The preparation method of the high-strength anti-crack concrete according to claim 1, which comprises the following steps:
(1) mixing and stirring 500 parts of 460-doped cement, 40-60 parts of fly ash, 30-50 parts of silica fume, 1150 parts of 1050-doped coarse aggregate, 600 parts of 580-doped fine aggregate, 40-60 parts of modified zeolite powder and 0.5-0.9 part of polypropylene fiber for 2-3 min;
(2) adding water and 15.4-17.1 parts of polycarboxylic acid water reducing agent into the mixture obtained in the step (1), and continuously stirring for 5-7min, wherein the water-to-glue ratio is 0.20-0.25;
(3) adding 140-160 parts of modified waste ABS plastic particles into the mixture obtained in the step (2), and continuously stirring for 3-5 min;
(4) and (3) forming at normal temperature, removing the mold for 24 hours, and performing standard curing for 28 days to obtain the high-strength anti-crack concrete.
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Effective date of registration: 20230103 Address after: 330000 United Factory Building (1-3 floors) to the west of Yulin Road, Nanchang Economic and Technological Development Zone, Jiangxi Province Patentee after: CSCEC Commercial Concrete Jiangxi Co.,Ltd. Patentee after: CHINA STATE CONSTRUCTION READY MIXED CONCRETE Co.,Ltd. Patentee after: CHINA WEST CONSTRUCTION GROUP Co.,Ltd. Address before: 430074 building 11, Zhongdi University Industrial Park, No.19, fozuling 1st Road, Donghu New Technology Development Zone, Wuhan City, Hubei Province Patentee before: CHINA STATE CONSTRUCTION READY MIXED CONCRETE Co.,Ltd. Patentee before: CHINA WEST CONSTRUCTION GROUP Co.,Ltd. |