CN108793876B - Pervious concrete with waste concrete as aggregate, preparation method and application thereof - Google Patents
Pervious concrete with waste concrete as aggregate, preparation method and application thereof Download PDFInfo
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- CN108793876B CN108793876B CN201810703171.9A CN201810703171A CN108793876B CN 108793876 B CN108793876 B CN 108793876B CN 201810703171 A CN201810703171 A CN 201810703171A CN 108793876 B CN108793876 B CN 108793876B
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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
- C04B20/02—Treatment
- C04B20/023—Chemical treatment
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C11/00—Details of pavings
- E01C11/22—Gutters; Kerbs ; Surface drainage of streets, roads or like traffic areas
- E01C11/224—Surface drainage of streets
- E01C11/225—Paving specially adapted for through-the-surfacing drainage, e.g. perforated, porous; Preformed paving elements comprising, or adapted to form, passageways for carrying off drainage
- E01C11/226—Coherent pavings
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The pervious concrete with waste concrete as aggregate is prepared through the following steps: crushing and screening the pretreated waste concrete to obtain coarse aggregate and fine aggregate; soaking the coarse aggregate in an acid solution, fishing out and draining, and then adding sodium silicate or sodium metasilicate for surface modification; grinding and crushing the fine aggregate, the fly ash and the coal gangue to obtain micron-sized powder; the method comprises the steps of premixing portland cement, micron-sized powder, water, an additive and a reinforcing agent, adding the modified coarse aggregate, and mixing to form the pervious concrete taking waste concrete as aggregate. The invention improves the interface performance of the coarse aggregate, leads the waste concrete coarse aggregate and cement to form a mechanical network, improves the mechanical property of the pervious concrete, and improves the mechanical property and durability of the concrete by adjusting the component types and the content of the pervious concrete.
Description
Technical Field
The invention relates to the technical field of concrete regeneration, in particular to pervious concrete taking waste concrete as aggregate, and a preparation method and application thereof.
Background
With the rapid development of economy and urbanization construction, most cities in China are in the processes of old building demolition, old pavement cleaning, new building construction and new pavement laying. Therefore, a large amount of construction waste is transported to the outskirts or the periphery of cities for simple landfill or open stacking without any treatment, which wastes land and resources and pollutes the environment; on the other hand, the demand of the great-interest civil engineering on the sandstone aggregate is increasing, and a large amount of mined sandstone causes great damage to the natural environment. Therefore, the waste concrete is recycled as aggregate, which has important significance for saving resources, protecting environment and realizing sustainable development of buildings.
The urbanization construction gradually hardens and covers the ground surface of a modern city by water-blocking materials such as buildings, concrete and the like, blocks convection between the atmosphere and the ground surface, and forms an ecological artificial desert. Although the laying of compact concrete roads brings great convenience to people, the impervious road surfaces bring great negative effects to the ecological environment of the city.
Aiming at the ecological environment problems caused by waste concrete treatment and dense concrete laying, the research of preparing pervious concrete by taking waste concrete as a raw material becomes a hotspot of the current concrete research. At present, the concrete is generally crushed into coarse aggregate and fine aggregate of pervious concrete by a simple crushing method. The process is simple, so the prepared pervious concrete generally has the problems of poor mechanical strength, poor durability and the like.
Disclosure of Invention
In view of the above, the main objective of the present invention is to provide a pervious concrete with waste concrete as aggregate, a preparation method and applications thereof, so as to at least partially solve at least one of the above mentioned technical problems.
In order to achieve the purpose, the technical scheme of the invention is as follows:
as one aspect of the present invention, there is provided a method for preparing pervious concrete using waste concrete as aggregate, comprising the steps of:
step 1: crushing and screening the pretreated waste concrete to obtain coarse aggregate with the particle size of 4-15 mm and fine aggregate with the particle size of less than 4 mm;
step 2: soaking the coarse aggregate in an acid solution, fishing out and draining, and then adding sodium silicate or sodium metasilicate to modify the surface of the coarse aggregate to obtain a modified coarse aggregate;
and step 3: grinding and crushing the fine aggregate, the fly ash and the coal gangue to obtain micron-sized powder;
and 4, step 4: premixing the portland cement, the micron-sized powder, the water, the additive and the reinforcing agent, adding the modified coarse aggregate, and mixing to form the pervious concrete taking the waste concrete as the aggregate.
In the step 2, the acid solution comprises a phosphoric acid solution or a nitric acid solution with the concentration of 2-10%, and the soaking time is 15-45 min.
In the step 4, the reinforcing agent comprises a first component, a second component and a third component, wherein the first component is triethanolamine or a mixture of sodium naphthalene sulfonate formaldehyde condensate, polyvinyl alcohol modified resin and acrylamide modified resin; the second component is glass fiber or polypropylene fiber; the third component is epoxy resin or phenolic resin;
the additive comprises an air entraining agent and a water reducing agent, wherein the air entraining agent comprises 10.25-20.13% of rosin powder, 10.25-20.13% of 40 wt% sodium hydroxide solution, 2.46-8.67% of 30 wt% hydrogen peroxide, 10.25-20.13% of 10 wt% potassium permanganate solution and 30.33-65.45% of water by mass; the water reducing agent is an HG-FDN type water reducing agent.
In the first component, the sodium salt of the naphthalene sulfonic acid formaldehyde condensate accounts for 50.05-75.23% of the total mass of the first component, the polyvinyl alcohol modified resin accounts for 10.67-20.05% of the total mass of the first component, and the acrylamide modified resin accounts for 10.67-20.05% of the total mass of the first component.
Wherein, the usage of the Portland cement accounts for 15.47 to 16.29 percent of the total amount of the raw materials according to the mass fraction; the dosage of the coarse aggregate accounts for 60.36 to 77.38 percent of the total amount of the raw materials; the amount of the fine aggregate accounts for 2.15 to 8.05 percent of the total amount of the raw materials; the amount of water accounts for 4.16-5.70% of the total amount of the raw materials; the amount of the sodium silicate accounts for 1.05-4.56% of the total amount of the raw materials; the using amount of the fly ash accounts for 0.05 to 0.1 percent of the total amount of the raw materials; the amount of the coal gangue accounts for 0.10 to 0.50 percent of the total amount of the raw materials; the dosage of the additive accounts for 1.06% -1.81% of the total amount of the raw materials; the dosage of the reinforcing agent accounts for 0.42 to 1.93 percent of the total amount of the raw materials.
Wherein, in the admixture, the amount of the air entraining agent accounts for 0.03-0.1% of the total amount of the raw materials; the amount of the water reducing agent accounts for 1.03-1.71% of the total amount of the raw materials.
Wherein, in the reinforcing agent, the dosage of the first component accounts for 0.01-0.1% of the total amount of the raw materials, the dosage of the second component accounts for 0.31-0.98% of the total amount of the raw materials, and the dosage of the third component accounts for 0.1-0.85% of the total amount of the raw materials.
In the step 1, the pretreatment step comprises classifying and separating the waste concrete to separate steel bars, plastics, wood fibers and paper from the waste concrete;
in the step 2, before the coarse aggregate is soaked in the acid solution, the method also comprises the step of washing the coarse aggregate with water to elute surface dust;
and step 3, adding the surface dust into the fine aggregate, the fly ash and the coal gangue for grinding and crushing.
As a further aspect of the present invention, there is provided a pervious concrete with waste concrete as aggregate, prepared by the method as described above, comprising the following components in mass fraction: 15.47 to 16.29 percent of Portland cement; 60.36 to 77.38 percent of coarse aggregate; 2.15 to 8.05 percent of fine aggregate; 4.16 to 5.70 percent of water; 1.05 to 4.56 percent of sodium silicate; 0.05 to 0.1 percent of fly ash; 0.10 to 0.50 percent of coal gangue; 1.06 percent to 1.81 percent of additive; 0.42 to 1.93 percent of reinforcing agent.
As a further aspect of the invention, the invention provides the application of the pervious concrete prepared by the method in the preparation of sponge pavements.
Based on the technical scheme, the invention has the beneficial effects that:
(1) the coarse aggregate is modified by acid washing and sodium silicate, active sites are formed on the surface of the waste concrete coarse aggregate, and the active sites are favorable for carrying out chemical reaction with silicate and calcium salt in cement to form a composite substance, so that the coarse aggregate and the cement form a mechanical network, the interface performance of the coarse aggregate is improved, and the mechanical performance of the pervious concrete is improved.
(2) The addition of the epoxy resin/phenolic resin obviously improves the elastic modulus of the pervious concrete, avoids cracking of the pervious concrete, and improves the durability and frost resistance of the pervious concrete.
(3) The pervious concrete prepared by taking the waste concrete as the aggregate is applied to the sponge pavement, so that the problems of 'heat island effect' and 'urban waterlogging' caused by building waste stacking and hard concrete laying in the current urbanization process are solved, and a sustainable development solution is provided for waste concrete treatment.
Drawings
FIG. 1 is a flow chart of a method for preparing pervious concrete by using waste concrete as aggregate according to an embodiment of the invention.
Detailed Description
In order that the objects, technical solutions and advantages of the present invention will become more apparent, the present invention will be further described in detail with reference to the accompanying drawings in conjunction with the following specific embodiments.
The invention provides pervious concrete taking waste concrete as aggregate, a preparation method and application thereof, wherein the interface performance of the coarse aggregate is improved by acid washing and sodium silicate modification in the preparation process, so that the waste concrete coarse aggregate and cement form a mechanical network, the mechanical property of the pervious concrete is improved, and the mechanical property and durability of the concrete are further improved by adjusting the component types and contents of the pervious concrete, so that the problems of 'heat island effect' and 'urban waterlogging' caused by building waste stacking and hard concrete laying in the current urbanization process are solved.
As one aspect of the present invention, there is first provided a method for preparing pervious concrete using waste concrete as aggregate, as shown in fig. 1, comprising the steps of:
firstly, pretreating waste concrete;
specifically, the waste concrete is subjected to pretreatment such as classification and separation, and reinforcing steel bars, plastics, wood fibers and paper in the waste concrete are separated.
Secondly, crushing and screening the pretreated waste concrete;
specifically, firstly, a jaw crusher is used for crushing waste concrete, then the crushed waste concrete is conveyed to a high-strength vibration screening device, the waste concrete with concentrated stress is crushed through the vibration screening device, and the crushed concrete is screened into coarse aggregate with the thickness of 4-15 mm and fine aggregate with the thickness of less than 4 mm.
Thirdly, washing the coarse aggregate and grinding the fine aggregate;
on one hand, the screened coarse aggregate is put into a water tank for cleaning, and dust on the surface of the coarse aggregate is eluted, so that the formation of active sites of the coarse aggregate is facilitated;
on the other hand, the dust cleaned from the screened fine aggregate and the screened coarse aggregate is sent to a crusher to be milled and crushed with the fly ash and the coal gangue to prepare micron-sized powder, and the particle size of the micron-sized powder is generally less than 40 μm.
Fourthly, acid washing is carried out on the coarse aggregate;
specifically, the washed coarse aggregate is placed into a phosphoric acid or nitric acid solution with the concentration of 2-10% to be soaked for 15-45 min, the surface of the coarse aggregate is subjected to acid treatment, then the coarse aggregate is taken out and drained, and the phosphoric acid solution is preferably used as a soaking solution, so that phosphosilicate is formed, on one hand, pores in the coarse aggregate are blocked, on the other hand, a porous medium is formed on an interface, and the water permeability is improved.
Fifthly, modifying the coarse aggregate with sodium silicate or sodium metasilicate;
specifically, sodium silicate or sodium metasilicate is added into the coarse aggregate soaked by phosphoric acid, the sodium silicate or sodium metasilicate and the coarse aggregate are fully coagulated by stirring, the surface of the coarse aggregate is modified by the sodium silicate or sodium metasilicate, on one hand, the generated silicic acid gel blocks pores of the coarse aggregate and bonds internal microcracks, so that the compactness and strength of the coarse aggregate are improved, and on the other hand, the coarse aggregate modified by the sodium silicate or sodium metasilicate can form a mechanical network with cement.
Sixthly, preparing pervious concrete;
the method comprises the following steps of firstly premixing portland cement, micron-sized powder, water, an additive and a reinforcing agent, then adding modified coarse aggregate, and mixing to form the pervious concrete taking waste concrete as aggregate;
the additive comprises an air entraining agent and a water reducing agent, wherein the air entraining agent selected by the invention comprises 10.25-20.13% of rosin powder, 10.25-20.13% of 40% sodium hydroxide solution, 2.46-8.67% of 30% hydrogen peroxide, 10.25-20.13% of 10% potassium permanganate solution and 30.33-65.45% of water by mass percent, and other conventional air entraining agents can be selected certainly; as an example, the water reducing agent selected by the invention is an HG-FDN type water reducing agent, but is not limited to the HG-FDN type water reducing agent;
the reinforcing agent comprises a first component, a second component and a third component and is mainly used for improving the mechanical property of concrete, wherein the first component is triethanolamine or a mixture consisting of sodium naphthalene sulfonate formaldehyde condensate, polyvinyl alcohol modified resin and acrylamide modified resin; the second component is glass fiber or polypropylene fiber, for example, the glass fiber or polypropylene fiber with the length of 6-20 mm can be selected, and the toughness of the pervious concrete can be improved; the third component is epoxy resin or phenolic resin, so that the elastic modulus and the durability of the pervious concrete can be obviously improved; in the first component, the sodium salt of the naphthalene sulfonic acid formaldehyde condensate accounts for 50.05-75.23% of the total mass of the first component, the polyvinyl alcohol modified resin accounts for 10.67-20.05% of the total mass of the first component, and the acrylamide modified resin accounts for 10.67-20.05% of the total mass of the first component.
In the steps, the pervious concrete is prepared from the following raw materials in parts by mass: 15.47 to 16.29 percent of Portland cement, 60.36 to 77.38 percent of coarse aggregate, 2.15 to 8.05 percent of fine aggregate, 4.16 to 5.70 percent of water, 1.05 to 4.56 percent of sodium silicate, 0.05 to 0.1 percent of fly ash, 0.10 to 0.50 percent of coal gangue, 1.06 to 1.81 percent of additive and 0.42 to 1.93 percent of reinforcing agent;
furthermore, the dosage of the air entraining agent in the admixture is 0.03-0.1 percent, and the dosage of the water reducing agent is 1.03-1.71 percent; the dosage of the first component in the reinforcing agent is 0.01-0.1%, the dosage of the second component is 0.31-0.98%, and the dosage of the third component is 0.1-0.85%.
As still another aspect of the present invention, there is provided a pervious concrete using waste concrete as an aggregate, prepared by the method as described in the first to sixth steps above.
As a further aspect of the present invention, there is provided a use of the pervious concrete prepared by the method of the first to sixth steps in the preparation of a sponge pavement.
The technical solution of the present invention is further illustrated by the following specific examples:
example 1
According to the methods from the first step to the sixth step and the raw material dosage shown in the table 1, firstly, the waste concrete is pretreated, and reinforcing steel bars, plastics, wood fibers, paper and the like in the waste concrete are removed; crushing and screening the pretreated waste concrete to obtain coarse aggregate with the particle size of 4-15 mm and fine aggregate with the particle size of less than 4 mm; washing the coarse aggregate with water, eluting dust on the surface of the coarse aggregate, adding the eluted dust and the fine aggregate into the fly ash and the coal gangue together for grinding and crushing to obtain micron-sized powder with the particle size of less than 40 mu m; placing the washed coarse aggregate into a 5% phosphoric acid pool to be soaked for 30min, taking out the coarse aggregate, draining, and then adding sodium silicate to be fully mixed; the method comprises the steps of pre-stirring portland cement, micron-sized powder, water, HG-FDN type water reducing agent, air entraining agent, triethanolamine, glass fiber and epoxy resin, and then adding sodium silicate modified coarse aggregate to form the pervious concrete.
Examples 2 to 3
Similar to example 1, the preparation of the pervious concrete was carried out with only the kinds and amounts of the raw materials changed as shown in table 1.
Comparative examples 1 to 4
Similar to example 1, wherein comparative example 1 lacks the step of pickling the coarse aggregate; comparative example 2 lacks the step of sodium silicate modification of the acid-washed coarse aggregate; comparative example 3 no reinforcing agent was used; comparative example 4 the coarse aggregate and the fine aggregate were both natural coarse aggregates, and neither the coarse aggregate was modified nor the reinforcing agent was used.
Performance testing
And (3) testing the water permeability: the pervious concrete prepared in the embodiments 1 to 3 and the comparative examples 1 to 4 is made into a square test piece with the approximate size of 100mm multiplied by 100mm, the test piece is put into an organic glass container with the cross section of 100mm multiplied by 100mm and the scale opened up and down, and then the wax is adopted to fill and seal the gap between the container and the test piece. Injecting water into the container to 180mm, starting timing when the water level is reduced to 160mm, and recording the time t1Height h of inner water level drop1(mm), the water permeability is T ═ h1/t1。
And (3) testing the compressive strength: the compressive strength of the pervious concrete prepared in examples 1 to 3 and comparative examples 1 to 4 was tested with reference to GB T0553-05, and the compressive strength was F ═ F/a, where F is the cubic compressive strength (MPa) of the pervious concrete, F is the breaking load (N), and a is the bearing area (mm) of the test piece2)。
As can be seen from the data in Table 1, the compressive property and the water permeability of the pervious concrete prepared by pickling the waste concrete, modifying with sodium silicate and adding the reinforcing agent are better, compared with the pervious concrete prepared from natural coarse aggregate and fine aggregate, the compressive property and the water permeability of the pervious concrete prepared from the waste concrete by pickling and modifying with sodium silicate and adding the reinforcing agent are better, so that the pervious concrete prepared by pickling, modifying with sodium silicate and adding the reinforcing agent can completely replace the natural aggregate to prepare the pervious concrete.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. A method for preparing pervious concrete by taking waste concrete as aggregate comprises the following steps:
step 1: crushing and screening the pretreated waste concrete to obtain coarse aggregate with the particle size of 4-15 mm and fine aggregate with the particle size of less than 4 mm;
step 2: soaking the coarse aggregate in an acid solution, fishing out and draining, adding sodium silicate or sodium metasilicate, fully coagulating the sodium silicate or sodium metasilicate and the coarse aggregate by stirring to modify the surface of the coarse aggregate to obtain a modified coarse aggregate, wherein the acid solution comprises a phosphoric acid solution or a nitric acid solution with the concentration of 2-10%, and the soaking time is 15-45 min;
and step 3: grinding and crushing the fine aggregate, the fly ash and the coal gangue to obtain micron-sized powder, wherein the particle size of the micron-sized powder is less than 40 mu m;
and 4, step 4: premixing portland cement, the micron-sized powder, water, an additive and a reinforcing agent, adding the modified coarse aggregate, and mixing to form pervious concrete taking waste concrete as aggregate, wherein the additive comprises an air entraining agent and a water reducing agent;
wherein the usage of the Portland cement accounts for 15.47 to 16.29 percent of the total amount of the raw materials according to the mass fraction; the dosage of the coarse aggregate accounts for 60.36 to 77.38 percent of the total amount of the raw materials; the amount of the fine aggregate accounts for 2.15 to 8.05 percent of the total amount of the raw materials; the amount of water accounts for 4.16-5.70% of the total amount of the raw materials; the amount of the sodium silicate accounts for 1.05-4.56% of the total amount of the raw materials; the using amount of the fly ash accounts for 0.05 to 0.1 percent of the total amount of the raw materials; the amount of the coal gangue accounts for 0.10 to 0.50 percent of the total amount of the raw materials; the dosage of the additive accounts for 1.06% -1.81% of the total amount of the raw materials; the dosage of the reinforcing agent accounts for 0.42 to 1.93 percent of the total amount of the raw materials.
2. The method according to claim 1, wherein, in step 4,
the reinforcing agent comprises a first component, a second component and a third component, wherein the first component is triethanolamine or a mixture consisting of sodium salt of naphthalene sulfonic acid formaldehyde condensate, polyvinyl alcohol modified resin and acrylamide modified resin; the second component is glass fiber or polypropylene fiber; the third component is epoxy resin or phenolic resin;
the air entraining agent comprises, by mass, 10.25-20.13% of rosin powder, 10.25-20.13% of 40 wt% sodium hydroxide solution, 2.46-8.67% of 30 wt% of hydrogen peroxide, 10.25-20.13% of 10 wt% of potassium permanganate solution, and 30.33-65.45% of water; the water reducing agent is an HG-FDN type water reducing agent.
3. The method according to claim 2, wherein in the first component, the sodium salt of the naphthalenesulfonic acid-formaldehyde condensate accounts for 50.05% -75.23% of the total mass of the first component, the polyvinyl alcohol-modified resin accounts for 10.67% -20.05% of the total mass of the first component, and the acrylamide-modified resin accounts for 10.67% -20.05% of the total mass of the first component.
4. The method according to claim 2, characterized in that the air entraining agent accounts for 0.03-0.1% of the total amount of the raw materials in the admixture by mass fraction; the amount of the water reducing agent accounts for 1.03-1.71% of the total amount of the raw materials.
5. The method according to claim 2, wherein the amount of the first component in the reinforcing agent is 0.01-0.1%, the amount of the second component is 0.31-0.98% and the amount of the third component is 0.1-0.85% of the total amount of the raw materials.
6. The method of claim 1, wherein:
in the step 1, the step of pretreating comprises classifying and separating the waste concrete to separate steel bars, plastics, wood fibers and paper in the waste concrete;
in the step 2, before the coarse aggregate is soaked in the acid solution, the method also comprises the step of washing the coarse aggregate with water to elute surface dust;
and step 3, adding the surface dust into the fine aggregate, the fly ash and the coal gangue for grinding and crushing.
7. Pervious concrete with waste concrete as aggregate, prepared by the method of any one of claims 1 to 6, comprising the following components in mass fraction: 15.47 to 16.29 percent of Portland cement; 60.36 to 77.38 percent of coarse aggregate; 2.15 to 8.05 percent of fine aggregate; 4.16 to 5.70 percent of water; 1.05 to 4.56 percent of sodium silicate; 0.05 to 0.1 percent of fly ash; 0.10 to 0.50 percent of coal gangue; 1.06 percent to 1.81 percent of additive; 0.42 to 1.93 percent of reinforcing agent.
8. Use of a pervious concrete obtained by the method according to any one of claims 1 to 6 for the preparation of a sponge pavement.
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