CN113816686A - Method for preparing recycled aggregate pervious concrete by using aqueous permeable crystallization solution - Google Patents
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- CN113816686A CN113816686A CN202111200736.XA CN202111200736A CN113816686A CN 113816686 A CN113816686 A CN 113816686A CN 202111200736 A CN202111200736 A CN 202111200736A CN 113816686 A CN113816686 A CN 113816686A
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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
- 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
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1074—Silicates, e.g. glass
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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
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00284—Materials permeable to liquids
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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 discloses a method for preparing recycled aggregate pervious concrete by using an aqueous permeable crystallization solution, which comprises the following steps: soaking 414-683 parts by mass of air-dried recycled aggregate in an aqueous permeable crystallization solution, filtering, taking out and drying; carbonizing the dried recycled aggregate; and (2) mixing and stirring 35.4-36.6 parts by mass of water, 18-22 parts by mass of admixture, 100 parts by mass of cement, 0.74-1.22 parts by mass of water reducing agent and 2.23-3.69 parts by mass of EVA emulsion to obtain the recycled aggregate permeable concrete. The invention has the advantages that: the recycled aggregate pervious concrete reinforced by the double aggregates and modified by the EVA has the advantages of light weight, environmental protection and excellent performances in all aspects.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to a method for preparing recycled aggregate permeable concrete by using an aqueous permeable crystallization solution.
Background
With the acceleration of urbanization and industrialization, city and industrial construction are deepened continuously. On one hand, the generation of a large amount of construction waste is caused by the updating of real estate construction, and the ecological environment is seriously damaged; on the other hand, urban roads are often made of water-blocking materials, have accumulated water on the ground and are in short supply of underground water, are not beneficial to plant growth and are not beneficial to circulation of heat and moisture in the air. The pervious concrete belongs to environment-friendly ecological concrete, can effectively protect water resources, relieve drainage pressure, reduce urban heat island effect and is beneficial to the construction of sponge cities.
The construction waste is also an important factor for polluting the ecological environment at present, and hardened cement slurry is attached to the surface of the recycled aggregate obtained by crushing the waste concrete, so that the defects of high apparent porosity, low strength, high water absorption and the like of the recycled aggregate are caused, so that the recycled aggregate concrete has poor fluidity and low strength, and the pervious concrete has higher requirements on the aggregate. By carrying out strengthening treatment on the recycled aggregate, the mechanical property of the recycled aggregate is improved, the surface structure is optimized, the water absorption rate is reduced, and the performance of the recycled pervious concrete can be effectively improved.
In the prior art, when the recycled aggregate is used for preparing the pervious concrete, the surface of the recycled aggregate is optimized by adopting a traditional slurry wrapping method or is strengthened by adopting an organic polymer, so that the interfacial adhesion between the aggregates is increased, but the prepared recycled aggregate pervious concrete has low strength and poor water permeability. The performance of the recycled aggregate pervious concrete is difficult to improve by a specific single aggregate strengthening method, the concrete strength is low, the porosity is small, the water permeability is poor, and the durability and the like cannot reach the standard. Therefore, how to produce high-quality recycled aggregate pervious concrete at lower cost is a great problem to be solved urgently.
Disclosure of Invention
The invention aims to provide a method for preparing recycled aggregate pervious concrete by using an aqueous permeable crystallization solution, wherein the recycled aggregate is subjected to strengthening treatment by using the aqueous permeable crystallization solution and then CO is adopted2The gas optimally reinforces the recycled aggregate,and adding water, admixture, cement, water reducing agent and EVA emulsion into the recycled aggregate for mixing and stirring to obtain the recycled aggregate pervious concrete with higher strength, water permeability and durability.
The purpose of the invention is realized by the following technical scheme:
a method for preparing recycled aggregate pervious concrete by using an aqueous permeable crystallization solution is characterized by comprising the following steps: the method comprises the following steps:
step (1): soaking 414-683 parts by mass of air-dried recycled aggregate in an aqueous permeable crystallization solution, filtering, taking out and drying;
step (2): carbonizing the dried recycled aggregate in the step (1);
and (3): and (3) mixing and stirring 35.4-36.6 parts by mass of water, 18-22 parts by mass of admixture, 100 parts by mass of cement, 0.74-1.22 parts by mass of water reducer and 2.23-3.69 parts by mass of EVA emulsion after the recycled aggregate is carbonized in the step (2) to obtain the recycled aggregate permeable concrete.
The recycled aggregate is the aggregate with the particle size range of 4.75-26.5mm after the waste concrete is crushed, sieved and washed; the recycled aggregate has a bulk porosity of 35% and a bulk density in the range of 1350-3。
The aqueous osmotic crystallization solution consists of sodium silicate, a catalyst and an auxiliary agent.
The admixture is fly ash and mineral powder; the cement is 52.5 ordinary portland cement; the water reducing agent is a naphthalene water reducing agent; the solid content of the EVA emulsion is 55.0%, the viscosity at 20 ℃ is 150cP, and the pH value is 6.0; the mass ratio of the recycled aggregate to the cementing material to the water is 5.6: 1: 0.3, wherein the cementing material is the cement and the admixture; the water-cement ratio of the recycled aggregate pervious concrete is 0.3.
The compressive strength of the recycled aggregate pervious concrete is 25-30MPa, the effective porosity is 10% -30%, and the permeability coefficient is 2-5 mm/s.
The recycled aggregate pervious concrete comprises the following raw materials in parts by weight: 100 parts of cement, 19-21 parts of admixture, 425 and 679 parts of recycled aggregate, 35.9-36.4 parts of water, 0.82-1.19 parts of water reducing agent and 2.03-3.41 parts of EVA emulsion.
In the step (1), the soaking time of the recycled aggregate is 3 hours, and the recycled aggregate is placed on a plastic flat plate in a curing room for drying, wherein the placing time is 1 day.
In the step (2), the recycled aggregate is put into a carbonization box for carbonization treatment, and CO in the carbonization box is controlled2The gas concentration is 20% +/-3%, the relative humidity is 60% +/-2%, the temperature is 20 +/-2 ℃, and the carbonization treatment is stopped after the carbonization weight gain rate of the recycled aggregate is measured continuously for three times and is not increased.
CO of the carbonization chamber2The gas concentration is 20% +/-1%, the relative humidity is 60% +/-1%, and the temperature is 20 +/-1 ℃.
In the step (3), the recycled aggregate is mixed with 50% of water for 15s, then the admixture is added into the recycled aggregate and is mixed for 15s continuously, so that the admixture is wrapped on the surface of the recycled aggregate, then the cement is added and is mixed for 30s continuously, and finally the remaining 50% of water, the water reducer and the EVA emulsion are added and are mixed for 60 s.
The invention has the advantages that:
1. the water-based permeable crystallization solution is used, so that the water-based permeable crystallization solution can effectively and rapidly permeate into the recycled aggregate to generate silica gel in capillary pores and micro cracks, and stable calcium silicate crystals are formed after dehydration and solidification, so that the porosity of the surface of the recycled aggregate is effectively reduced, the water-proof layer is integrated with the slurry on the surface of the initial aggregate into a whole so as to have high stability, the compactness and the compressive strength of the surface layer of concrete are increased, and the recycled aggregate treated by the water-based permeable crystallization solution not only can improve the strength of the aggregate, but also can increase the binding force among the aggregates;
2. after the recycled aggregate is treated by the aqueous permeable crystallization solution, CO is carried out2Auxiliary strengthening treatment for accelerating the hardening of silica gel generated after DPS treatment and generating calcium silicate crystal, silicon dioxide, calcium carbonate and the like in the surface pores of the recycled aggregate to densify the recycled aggregateThe surface structure improves the strength of the recycled aggregate and reduces the water absorption;
3. the recycled aggregate pervious concrete reinforced by the double aggregates and modified by the EVA has the advantages of light weight, environmental protection and excellent performances in all aspects.
Drawings
FIG. 1 is a table showing various properties of the recycled aggregate pervious concrete raw materials in different mass ratios.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example in conjunction with the following drawings to facilitate understanding by those skilled in the art:
example 1: the embodiment relates to a method for preparing recycled aggregate pervious concrete by using an aqueous permeable crystallization solution, as shown in fig. 1, the recycled aggregate pervious concrete of an experimental group 1 comprises the following raw materials in parts by mass: 100 portions of cement, 18 portions of admixture, 414 portions of recycled aggregate, 35.4 portions of water, 0.74 portion of naphthalene water reducing agent and 2.23 portions of EVA (ethylene-vinyl acetate copolymer) emulsion, and the method comprises the following steps:
step (1): soaking the air-dried recycled aggregate in the aqueous permeable crystallization solution for 3h, filtering, taking out, placing on a plastic flat plate in a curing room, and standing for 1 day. Wherein the recycled aggregate is the aggregate with the particle size range of 4.75-26.5mm after the waste concrete is crushed, sieved and washed; the recycled aggregate has a bulk porosity of 35% and a bulk density in the range of 1450kg/m3(ii) a The aqueous permeable crystallization solution consists of sodium silicate with the concentration of 100%, a catalyst and an auxiliary agent, the content of active substances is 75%, the aqueous permeable crystallization solution can effectively and rapidly permeate into the recycled aggregate to generate silica gel in capillary pores and micro cracks, and stable calcium silicate crystals are formed after dehydration and solidification, so that the porosity of the surface of the recycled aggregate is effectively reduced, the aqueous permeable crystallization solution is integrated with slurry on the surface of the initial aggregate to ensure that a waterproof layer has high stability, the compactness and the compressive strength of a concrete surface layer are increased, and the recycled aggregate treated by aqueous permeable crystallization not only can improve the strength of the aggregate, but also can increase the cohesive force among the aggregates.
Step (2): putting the dried recycled aggregate in the step (1) into a carbonization box for carbonization treatment, and controlling CO2The gas concentration is 20%, the relative humidity is 60%, the temperature is 20 ℃, and the carbonization treatment is stopped after carbonization is carried out for three times continuously to measure the carbonization weight gain rate of the recycled aggregate and not to increase any more. The carbonization time depends on the carbonization weight gain rate, and when the carbonization weight gain rate of the test sample does not increase for 3 times, the regenerated aggregate reaches the limit carbonization weight gain rate, namely the carbonization time. After the recycled aggregate is treated by the aqueous permeable crystallization solution, CO is carried out2And (3) auxiliary strengthening treatment, namely accelerating the hardening of the silica gel generated after the DPS treatment, and generating calcium silicate crystals, silicon dioxide, calcium carbonate and the like in pores on the surface of the recycled aggregate, so that the surface structure of the recycled aggregate is densified, the strength of the recycled aggregate is improved, and the water absorption is reduced.
And (3): and (3) mixing the carbonized recycled aggregate in the step (2) with 50% of water for 15s, adding an admixture into the wet aggregate, continuously mixing for 15s to wrap the admixture on the surface of the aggregate, adding cement, continuously stirring for 30s, finally adding the rest water, a naphthalene water reducer and an EVA emulsion, and stirring for 60s to obtain the recycled aggregate pervious concrete with optimized performance. Wherein the admixture is industrial wastes such as fly ash, mineral powder and the like; the cement is 52.5 ordinary Portland cement with the density of 3021kg/m3(ii) a The EVA emulsion has a solid content of 55.0%, a viscosity of 150cP (20 ℃) and a pH value of 6.0.
As shown in FIG. 1, the recycled aggregate concrete 28d of the experimental group 1 obtained by the measurement after the molding in the above steps has a compressive strength of 27.5MPa, an effective porosity of 16.5% and a water permeability coefficient of 2.83 mm/s.
Example 2: the embodiment relates to a method for preparing recycled aggregate pervious concrete by using an aqueous permeable crystallization solution, as shown in fig. 1, the recycled aggregate pervious concrete of an experimental group 2 comprises the following raw materials in parts by mass: 100 portions of cement, 22 portions of admixture, 483 portions of recycled aggregate, 36.6 portions of water, 1.22 portions of naphthalene water reducing agent and 3.69 portions of EVA emulsion, and the method comprises the following steps:
step (1): soaking the air-dried recycled aggregate in the aqueous permeable crystallization solution for 3h, filtering, taking out, placing on a plastic flat plate in a curing room, and standing for 1 day. Wherein the recycled aggregate is the aggregate with the particle size range of 4.75-26.5mm after the waste concrete is crushed, sieved and washed; the aqueous permeable crystallization solution consists of sodium silicate with the concentration of 100%, a catalyst and an auxiliary agent, the content of active substances is 75%, the aqueous permeable crystallization solution can effectively and rapidly permeate into the recycled aggregate to generate silica gel in capillary pores and micro cracks, and stable calcium silicate crystals are formed after dehydration and solidification, so that the porosity of the surface of the recycled aggregate is effectively reduced, the aqueous permeable crystallization solution is integrated with slurry on the surface of the initial aggregate to ensure that a waterproof layer has high stability, the compactness and the compressive strength of a concrete surface layer are increased, and the recycled aggregate treated by aqueous permeable crystallization not only can improve the strength of the aggregate, but also can increase the cohesive force among the aggregates.
Step (2): putting the dried recycled aggregate in the step (1) into a carbonization box for carbonization treatment, and controlling CO2The gas concentration is 20%, the relative humidity is 60%, the temperature is 20 ℃, and the carbonization treatment is stopped after carbonization is carried out for three times continuously to measure the carbonization weight gain rate of the recycled aggregate and not to increase any more. The carbonization time depends on the carbonization weight gain rate, and when the carbonization weight gain rate of the test sample does not increase for 3 times, the regenerated aggregate reaches the limit carbonization weight gain rate, namely the carbonization time. After the recycled aggregate is treated by the aqueous permeable crystallization solution, CO is carried out2And (3) auxiliary strengthening treatment, namely accelerating the hardening of the silica gel generated after the DPS treatment, and generating calcium silicate crystals, silicon dioxide, calcium carbonate and the like in pores on the surface of the recycled aggregate, so that the surface structure of the recycled aggregate is densified, the strength of the recycled aggregate is improved, and the water absorption is reduced.
And (3): and (3) mixing the carbonized recycled aggregate in the step (2) with 50% of water for 15s, adding an admixture into the wet aggregate, continuously mixing for 15s to wrap the admixture on the surface of the aggregate, adding cement, continuously stirring for 30s, finally adding the rest water, a naphthalene water reducer and an EVA emulsion, and stirring for 60s to obtain the recycled aggregate pervious concrete with optimized performance. Wherein the admixture is industrial wastes such as fly ash, mineral powder and the like; the cement is 52.5 ordinary Portland cementDensity of 3021kg/m3(ii) a The EVA emulsion has a solid content of 55.0%, a viscosity of 150cP (20 ℃) and a pH value of 6.0.
As shown in FIG. 1, the recycled aggregate concrete 28d of the experimental group 2 obtained by the measurement after the molding according to the above steps has a compressive strength of 28.7MPa, an effective porosity of 14.5% and a water permeability coefficient of 2.68 mm/s.
Example 3: the embodiment relates to a method for preparing recycled aggregate pervious concrete by using an aqueous permeable crystallization solution, as shown in fig. 1, the recycled aggregate pervious concrete of an experimental group 3 comprises the following raw materials in parts by mass: 100 portions of cement, 19 portions of admixture, 425 portions of recycled aggregate, 35.9 portions of water, 0.82 portion of naphthalene water reducer and 2.03 portions of EVA emulsion, and the method comprises the following steps:
step (1): soaking the air-dried recycled aggregate in the aqueous permeable crystallization solution for 3h, filtering, taking out, placing on a plastic flat plate in a curing room, and standing for 1 day. Wherein the recycled aggregate is the aggregate with the particle size range of 4.75-26.5mm after the waste concrete is crushed, sieved and washed; the aqueous permeable crystallization solution consists of sodium silicate with the concentration of 100%, a catalyst and an auxiliary agent, the content of active substances is 75%, the aqueous permeable crystallization solution can effectively and rapidly permeate into the recycled aggregate to generate silica gel in capillary pores and micro cracks, and stable calcium silicate crystals are formed after dehydration and solidification, so that the porosity of the surface of the recycled aggregate is effectively reduced, the aqueous permeable crystallization solution is integrated with slurry on the surface of the initial aggregate to ensure that a waterproof layer has high stability, the compactness and the compressive strength of a concrete surface layer are increased, and the recycled aggregate treated by aqueous permeable crystallization not only can improve the strength of the aggregate, but also can increase the cohesive force among the aggregates.
Step (2): putting the dried recycled aggregate in the step (1) into a carbonization box for carbonization treatment, and controlling CO2The gas concentration is 20%, the relative humidity is 60%, the temperature is 20 ℃, and the carbonization treatment is stopped after carbonization is carried out for three times continuously to measure the carbonization weight gain rate of the recycled aggregate and not to increase any more. The carbonization time depends on the carbonization weight gain rate, when the carbonization weight gain rate of the test sample does not increase for 3 times, the regenerated aggregate reaches the limit carbonization weight gain rate, namely the carbonization time is reached. After the recycled aggregate is treated by the aqueous permeable crystallization solution, CO is carried out2And (3) auxiliary strengthening treatment, namely accelerating the hardening of the silica gel generated after the DPS treatment, and generating calcium silicate crystals, silicon dioxide, calcium carbonate and the like in pores on the surface of the recycled aggregate, so that the surface structure of the recycled aggregate is densified, the strength of the recycled aggregate is improved, and the water absorption is reduced.
And (3): and (3) mixing the carbonized recycled aggregate in the step (2) with 50% of water for 15s, adding an admixture into the wet aggregate, continuously mixing for 15s to wrap the admixture on the surface of the aggregate, adding cement, continuously stirring for 30s, finally adding the rest water, a naphthalene water reducer and an EVA emulsion, and stirring for 60s to obtain the recycled aggregate pervious concrete with optimized performance. Wherein the admixture is industrial wastes such as fly ash, mineral powder and the like; the cement is 52.5 ordinary Portland cement with the density of 3021kg/m3(ii) a The EVA emulsion has a solid content of 55.0%, a viscosity of 150cP (20 ℃) and a pH value of 6.0.
As shown in FIG. 1, the recycled aggregate concrete 28d of the experimental group 3 obtained by the measurement after the molding in the above procedure has a compressive strength of 29.3MPa, an effective porosity of 27.1% and a water permeability coefficient of 4.61 mm/s.
Example 4: the embodiment relates to a method for preparing recycled aggregate pervious concrete by using an aqueous permeable crystallization solution, as shown in fig. 1, the recycled aggregate pervious concrete of an experimental group 4 comprises the following raw materials in parts by mass: 100 portions of cement, 21 portions of admixture, 679 portions of recycled aggregate, 36.4 portions of water, 1.19 portions of naphthalene water reducing agent and 3.41 portions of EVA emulsion, and the method comprises the following steps:
step (1): soaking the air-dried recycled aggregate in the aqueous permeable crystallization solution for 3h, filtering, taking out, placing on a plastic flat plate in a curing room, and standing for 1 day. Wherein the recycled aggregate is the aggregate with the particle size range of 4.75-26.5mm after the waste concrete is crushed, sieved and washed; the aqueous permeable crystallization solution consists of sodium silicate with the concentration of 100%, a catalyst and an auxiliary agent, the content of active substances is 75%, the aqueous permeable crystallization solution can effectively and rapidly permeate into the recycled aggregate to generate silica gel in capillary pores and micro cracks, and stable calcium silicate crystals are formed after dehydration and solidification, so that the porosity of the surface of the recycled aggregate is effectively reduced, the aqueous permeable crystallization solution is integrated with slurry on the surface of the initial aggregate to ensure that a waterproof layer has high stability, the compactness and the compressive strength of a concrete surface layer are increased, and the recycled aggregate treated by aqueous permeable crystallization not only can improve the strength of the aggregate, but also can increase the cohesive force among the aggregates.
Step (2): putting the dried recycled aggregate in the step (1) into a carbonization box for carbonization treatment, and controlling CO2The gas concentration is 20%, the relative humidity is 60%, the temperature is 20 ℃, and the carbonization treatment is stopped after carbonization is carried out for three times continuously to measure the carbonization weight gain rate of the recycled aggregate and not to increase any more. The carbonization time depends on the carbonization weight gain rate, and when the carbonization weight gain rate of the test sample does not increase for 3 times, the regenerated aggregate reaches the limit carbonization weight gain rate, namely the carbonization time. After the recycled aggregate is treated by the aqueous permeable crystallization solution, CO is carried out2And (3) auxiliary strengthening treatment, namely accelerating the hardening of the silica gel generated after the DPS treatment, and generating calcium silicate crystals, silicon dioxide, calcium carbonate and the like in pores on the surface of the recycled aggregate, so that the surface structure of the recycled aggregate is densified, the strength of the recycled aggregate is improved, and the water absorption is reduced.
And (3): and (3) mixing the carbonized recycled aggregate in the step (2) with 50% of water for 15s, adding an admixture into the wet aggregate, continuously mixing for 15s to wrap the admixture on the surface of the aggregate, adding cement, continuously stirring for 30s, finally adding the rest water, a naphthalene water reducer and an EVA emulsion, and stirring for 60s to obtain the recycled aggregate pervious concrete with optimized performance. Wherein the admixture is industrial wastes such as fly ash, mineral powder and the like; the cement is 52.5 ordinary Portland cement with the density of 3021kg/m3(ii) a The EVA emulsion has a solid content of 55.0%, a viscosity of 150cP (20 ℃) and a pH value of 6.0.
As shown in FIG. 1, the recycled aggregate concrete 28d of the experimental group 4 obtained by the measurement after the molding according to the above steps has a compressive strength of 29.5MPa, an effective porosity of 21.5% and a water permeability coefficient of 3.81 mm/s.
In conclusion, the compressive strength of the recycled aggregate permeable concrete is 25-30MPa, which is improved by 5-20% compared with the conventional concrete; the effective porosity is 10-30%, which is improved by 6-15% compared with the conventional concrete; the water permeability coefficient is 2-5mm/s, the water permeability is improved by 13-21% compared with the conventional concrete, and the durability is also improved. In addition, the utilization rate of the waste of the concrete reaches about 75 percent, the economic and environmental benefits are obvious, the concrete can be effectively applied to the projects such as sidewalks, ecological slope protection, garden landscape roads and the like, and the concrete has positive and effective effects on the aspect of purifying water quality and air.
Although the conception and the embodiments of the present invention have been described in detail with reference to the drawings, those skilled in the art will recognize that various changes and modifications can be made therein without departing from the scope of the appended claims, and therefore, they are not to be considered repeated herein.
Claims (10)
1. A method for preparing recycled aggregate pervious concrete by using an aqueous infiltration crystallization solution, which is characterized by comprising the following steps:
step (1): soaking 414-683 parts by mass of air-dried recycled aggregate in an aqueous permeable crystallization solution, filtering, taking out and drying;
step (2): carbonizing the dried recycled aggregate in the step (1);
and (3): and (3) mixing and stirring 35.4-36.6 parts by mass of water, 18-22 parts by mass of admixture, 100 parts by mass of cement, 0.74-1.22 parts by mass of water reducer and 2.23-3.69 parts by mass of EVA emulsion after the recycled aggregate is carbonized in the step (2) to obtain the recycled aggregate permeable concrete.
2. The method for preparing recycled aggregate pervious concrete by using the aqueous permeable crystallization solution as claimed in claim 1, wherein the recycled aggregate is the aggregate with the particle size range of 4.75-26.5mm after the waste concrete is crushed, sieved and washed with water; the recycled aggregate has a bulk porosity of 35% and a bulk density in the range of 1350-3。
3. The method for preparing recycled aggregate pervious concrete using an aqueous infiltration crystallization solution according to claim 1, wherein said aqueous infiltration crystallization solution consists of sodium silicate, a catalyst and an auxiliary agent.
4. The method for preparing recycled aggregate pervious concrete using an aqueous infiltration crystallization solution according to claim 1, wherein the admixture is fly ash and mineral powder; the cement is 52.5 ordinary portland cement; the water reducing agent is a naphthalene water reducing agent; the solid content of the EVA emulsion is 55.0%, the viscosity at 20 ℃ is 150cP, and the pH value is 6.0; the mass ratio of the recycled aggregate to the cementing material to the water is 5.6: 1: 0.3, wherein the cementing material is the cement and the admixture; the water-cement ratio of the recycled aggregate pervious concrete is 0.3.
5. The method for preparing recycled aggregate pervious concrete by using the aqueous permeable crystallization solution as claimed in claim 1, wherein the recycled aggregate pervious concrete has a compressive strength of 25-30MPa, an effective porosity of 10% -30% and a permeability coefficient of 2-5 mm/s.
6. The method for preparing the recycled aggregate pervious concrete by using the aqueous permeable crystallization solution as claimed in claim 1, wherein the recycled aggregate pervious concrete comprises the following raw materials in parts by weight: 100 parts of cement, 19-21 parts of admixture, 425 and 679 parts of recycled aggregate, 35.9-36.4 parts of water, 0.82-1.19 parts of water reducing agent and 2.03-3.41 parts of EVA emulsion.
7. The method for preparing recycled aggregate pervious concrete using the aqueous infiltration crystallization solution according to claim 1, wherein in the step (1), the soaking time of the recycled aggregate is 3 hours, and the recycled aggregate is dried by being placed on a plastic plate in a curing room for 1 day.
8. The method of claim 1, wherein the step of preparing the mixture comprises using an aqueous osmotic crystallization solutionThe method for regenerating the pervious concrete of the aggregate is characterized in that in the step (2), the regenerated aggregate is put into a carbonization box for carbonization treatment, and CO in the carbonization box is controlled2The gas concentration is 20% +/-3%, the relative humidity is 60% +/-2%, the temperature is 20 +/-2 ℃, and the carbonization treatment is stopped after the carbonization weight gain rate of the recycled aggregate is measured continuously for three times and is not increased.
9. The method for preparing recycled aggregate pervious concrete using an aqueous infiltration crystallization solution according to claim 8, wherein the CO of the carbonization chamber2The gas concentration is 20% +/-1%, the relative humidity is 60% +/-1%, and the temperature is 20 +/-1 ℃.
10. The method for preparing recycled aggregate pervious concrete by using the aqueous infiltration crystallization solution, as claimed in claim 1, wherein in step (3), the recycled aggregate is mixed with 50% of the water for 15s, then the admixture is added to the recycled aggregate and further mixed for 15s, so as to wrap the admixture on the surface of the recycled aggregate, then the cement is added and further mixed for 30s, and finally the remaining 50% of the water, the water reducing agent and the EVA emulsion are added and mixed for 60 s.
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