CN112551978A - Preparation method of pervious concrete - Google Patents
Preparation method of pervious concrete Download PDFInfo
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- CN112551978A CN112551978A CN202011442560.4A CN202011442560A CN112551978A CN 112551978 A CN112551978 A CN 112551978A CN 202011442560 A CN202011442560 A CN 202011442560A CN 112551978 A CN112551978 A CN 112551978A
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/027—Lightweight 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
- 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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- 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
- C04B20/1018—Coating or impregnating with organic materials
- C04B20/1029—Macromolecular compounds
- C04B20/1033—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2038—Resistance against physical degradation
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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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
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- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention belongs to the technical field of concrete, and particularly relates to a preparation method of pervious concrete. The method comprises the steps of taking aluminum ash, fly ash and blast furnace slag as initial raw materials, extracting metal substances by using hydrochloric acid, precipitating metal ions by using a sodium hydroxide solution, mixing the metal ions with residues, mixing the residues with additives, carrying out ball milling to ensure that the residues are fully contacted, carrying out hot pressing to ensure that the interiors of the residues are closely combined, carrying out calcination, firstly converting metal hydroxides into metal oxides in the calcination process, combining the metal oxides with the additives to form mixed foam metal substances through the action of the additives, depositing the mixed foam metal substances on the surfaces and the interiors of the residues, combining the mixed foam metal substances with the mixtures, initiating through an initiator, forming polymer grafted particle surfaces through the reaction of the mixtures, enabling the polymers to be closely covered with particle pore passages, and further improving the strength and the wear resistance of the pervious concrete.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to a preparation method of pervious concrete.
Background
The pervious concrete is an environment-friendly high-permeability material and is widely applied to urban roads. The pervious concrete is used as a pavement paving material of a road, and has good water permeability and air permeability. The research shows that the high pore structure of the pervious concrete pavement can effectively permeate rainwater into the ground and reduce urban surface flood, and in addition, the through pores have the functions of sound absorption and noise reduction. The pervious concrete pavement also has a good ecological function, so that the quality of the infiltrated rainwater can be purified, the temperature and the humidity of the ground surface can be adjusted, and the urban heat island effect can be effectively slowed down. Under the guidance of the sustainable development concept, the research and application of the pervious concrete pavement engineering are rapidly developed in recent years, which plays a great role in solving the problem of unsmooth urban drainage in the metropolis.
The pervious concrete is a porous lightweight concrete which is prepared by mixing coarse aggregate, cementing material, water, admixture, fine aggregate (in rare cases, admixture) and the like according to a certain proportion through a certain mixing process, so the pervious concrete is also called sand-free concrete or macroporous concrete. The skeleton-gap structure is formed by using coarse aggregate with specific particle size fraction as a skeleton and using gelled slurry or mortar added with a small amount of fine aggregate as a cementing layer among aggregate particles. Due to the special structure with the communicated pores in the interior, the pervious concrete has good water and air permeability, and the strength of the pervious concrete is much lower than that of common concrete.
In pervious concrete, different particle size compositions, specific surface areas, surface morphologies and the like of the coarse aggregates directly influence design parameters such as porosity, pore size, permeability coefficient and the like after concrete forming, and further have important influence on the mechanical properties and water permeability of the pervious concrete. The aggregate with good gradation can effectively reduce the using amount of cement, water consumption and the using amount of additives, thereby reducing the risk of cracking and segregation of the pervious concrete, improving the strength and durability of the pervious concrete and improving the performance of the pervious concrete.
Compared with common concrete, the pervious concrete still has the defects of low strength, poor wear resistance and the like, and is mainly applied to sidewalks and bicycle tracks, garden landscape roads and parks, sides of swimming pools and stadiums, outdoor parking lots, light-weight roads in communities and other occasions at present.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: aiming at the problems of low strength and poor wear resistance of pervious concrete, the preparation method of the pervious concrete is provided.
In order to solve the technical problems, the invention adopts the following technical scheme:
a preparation method of pervious concrete comprises the following steps:
(1) stirring the mixture and a hydrochloric acid solution according to a mass ratio of 5: 7-9, filtering, collecting filter residues and a filtrate, mixing the filtrate and a sodium hydroxide solution according to a volume ratio of 5: 3-4, uniformly stirring, standing, filtering, collecting a filter cake, and mixing the filter cake and the filter residues to obtain a composite material;
(2) placing the composite material and the additive into a ball milling tank according to a mass ratio of 5-6: 1-3, carrying out ball milling under the protection of nitrogen, collecting ball grinding materials, placing the ball grinding materials into a press, carrying out hot pressing at 80-90 ℃ under 250-300 MPa, and collecting pressing materials;
(3) placing the pressed material into a calcining furnace for calcining, collecting a calcined material, placing the calcined material, water and an emulsifier into a reactor according to the mass ratio of 7: 10-13: 1 for stirring, then adding a mixture of 25-30% of the calcined material, heating and stirring, adding an initiator of 0.2-0.3% of the calcined material, stirring for reaction, standing, filtering, washing, drying, and collecting a dried substance;
(4) according to the weight parts, 120-200 parts of portland cement, 90-110 parts of a dry matter, 40-50 parts of quartz sand, 10-20 parts of pebbles and 3-5 parts of a polycarboxylic acid high-efficiency water reducing agent are uniformly stirred to obtain the pervious concrete.
The mixture in the step (1) is prepared by ball-milling aluminum ash, fly ash and blast furnace slag according to the mass ratio of 6: 4-5: 3, sieving, and collecting sieved particles.
And (3) uniformly mixing the additive in the step (2) with titanium hydride, sodium carbonate and a surfactant according to the mass ratio of 5:3: 0.3-0.5 to obtain the titanium-manganese.
The surfactant is any one of alkylphenol polyoxyethylene and fatty acid polyoxyethylene ester.
The mixture in the step (3) is prepared by mixing 4-vinylpyridine and acrylamide according to the mass ratio of 5: 3.
The emulsifier in the step (3) is any one of xylitol anhydride monostearate and polyoxyethylene xylitol anhydride monostearate.
The initiator in the step (3) is any one of ammonium persulfate and sodium persulfate.
Compared with other methods, the method has the beneficial technical effects that:
the invention takes aluminum ash, fly ash and blast furnace slag as initial raw materials, extracts metal substances in the aluminum ash, fly ash and blast furnace slag by using hydrochloric acid, enlarges the pore strength of fly ash and blast furnace slag particles in the aluminum ash, precipitates metal ions by using a sodium hydroxide solution, mixes the metal ions with residues, mixes the residues with an additive, ball-mills the mixture to ensure that the metal ions and the additive are fully contacted, then carries out hot pressing to ensure that the metal ions and the additive are closely combined, and then carries out calcination, wherein the metal hydroxide is converted into metal oxide during the calcination process and then is combined with the additive, a mixed foam metal substance is formed by the action of the additive and is deposited on the surface and the inside of the residue, so that the aluminum ash, the fly ash and the blast furnace slag can better support channels, improve the mechanical property of the particles and ensure the smoothness of the channels, and, through the reaction of utilizing the mixture, form polymer grafting particle surface, make the polymer closely cover with the granule pore, firstly can guarantee the protection to the pore, secondly has strengthened the smoothness on pore surface, can strengthen the dewatering performance to because the existence of polymer has improved the bonding property between granule and other raw materials, further improved pervious concrete intensity and wearability.
Detailed Description
The mixture is prepared by ball-milling aluminum ash, fly ash and blast furnace slag according to the mass ratio of 6: 4-5: 3, sieving, and collecting sieved particles.
The additive is prepared by uniformly mixing titanium hydride, sodium carbonate and a surfactant according to the mass ratio of 5:3: 0.3-0.5.
The surfactant is any one of alkylphenol polyoxyethylene and polyoxyethylene fatty acid ester.
The mixture is prepared by mixing 4-vinylpyridine and acrylamide according to the mass ratio of 5: 3.
The emulsifier is any one of xylitol anhydride monostearate and polyoxyethylene xylitol anhydride monostearate.
The initiator is any one of ammonium persulfate and sodium persulfate.
A preparation method of pervious concrete comprises the following steps:
(1) stirring the mixture and 1.3mol/L hydrochloric acid solution according to a mass ratio of 5: 7-9 at a speed of 600r/min for 1h, filtering, collecting filter residues and filtrate, mixing the filtrate and 1.1mol/L sodium hydroxide solution according to a volume ratio of 5: 3-4 for 50min, uniformly stirring, standing for 2h, filtering, collecting filter cakes, and mixing the filter cakes and the filter residues to obtain a composite material;
(2) placing the composite material and the additive into a ball milling tank according to a mass ratio of 5-6: 1-3, carrying out ball milling at 500r/min for 20min under the protection of nitrogen, collecting ball grinding materials, placing the ball grinding materials into a press, carrying out hot pressing at 80-90 ℃ and 250-300 MPa for 20min, and collecting pressed materials;
(3) placing the pressed material into a calcining furnace, calcining for 2 hours at 950-1100 ℃, collecting a calcined material, placing the calcined material, water and an emulsifier into a reactor according to the mass ratio of 7: 10-13: 1, stirring for 30 minutes at 600r/min, adding a mixture of 25-30% by mass of the calcined material, heating to 90 ℃, stirring for 40 minutes, adding an initiator of 0.2-0.3% by mass of the calcined material, stirring for 8 hours, standing for 2 hours, filtering, washing a filter cake, drying, and collecting a dried substance;
(4) according to the weight parts, 120-200 parts of portland cement, 90-110 parts of a dry matter, 40-50 parts of quartz sand, 10-20 parts of pebbles and 3-5 parts of a polycarboxylic acid high-efficiency water reducing agent are uniformly stirred to obtain the pervious concrete.
Example 1
The mixture is prepared by ball milling the aluminum ash, the fly ash and the blast furnace slag according to the mass ratio of 6: 5:3, sieving, collecting sieved particles and obtaining the mixture.
The additive is prepared by uniformly mixing titanium hydride, sodium carbonate and a surfactant according to the mass ratio of 5:3: 0.5.
The surfactant is any one of alkylphenol polyoxyethylene and polyoxyethylene fatty acid ester.
The mixture is prepared by mixing 4-vinylpyridine and acrylamide according to the mass ratio of 5: 3.
The emulsifier is any one of xylitol anhydride monostearate and polyoxyethylene xylitol anhydride monostearate.
The initiator is any one of ammonium persulfate and sodium persulfate.
A preparation method of pervious concrete comprises the following steps:
(1) stirring the mixture and 1.3mol/L hydrochloric acid solution according to a mass ratio of 5:9 at 600r/min for 1h, filtering, collecting filter residues and filtrate, mixing the filtrate and 1.1mol/L sodium hydroxide solution according to a volume ratio of 5: 4 for 50min, uniformly stirring, standing for 2h, filtering, collecting filter cakes, and mixing the filter cakes and the filter residues to obtain a composite material;
(2) putting the composite material and the additive into a ball milling tank according to the mass ratio of 6: 3, carrying out ball milling at 500r/min for 20min under the protection of nitrogen, collecting ball grinding materials, putting the ball grinding materials into a press, carrying out hot pressing at 90 ℃ and 300MPa for 20min, and collecting pressed materials;
(3) placing the pressed material into a calcining furnace to calcine for 2h at 1100 ℃, collecting the calcined material, placing the calcined material, water and an emulsifier into a reactor according to the mass ratio of 7: 13:1, stirring for 30min at 600r/min, adding a mixture of which the mass is 30% of the calcined material, heating to 90 ℃, stirring for 40min, adding an initiator of which the mass is 0.3% of the calcined material, stirring and reacting for 8h, standing for 2h, filtering, washing a filter cake, drying, and collecting a dried substance;
(4) according to the weight parts, 200 parts of portland cement, 110 parts of a dry matter, 50 parts of quartz sand, 20 parts of pebbles and 5 parts of polycarboxylic acid high-efficiency water reducing agent are uniformly stirred to obtain the pervious concrete.
Example 2
The mixture is prepared by ball milling the aluminum ash, the fly ash and the blast furnace slag according to the mass ratio of 6:4:3, sieving, collecting sieved particles and obtaining the mixture.
The additive is prepared by uniformly mixing titanium hydride, sodium carbonate and a surfactant according to the mass ratio of 5:3: 0.4.
The surfactant is any one of alkylphenol polyoxyethylene and polyoxyethylene fatty acid ester.
The mixture is prepared by mixing 4-vinylpyridine and acrylamide according to the mass ratio of 5: 3.
The emulsifier is any one of xylitol anhydride monostearate and polyoxyethylene xylitol anhydride monostearate.
The initiator is any one of ammonium persulfate and sodium persulfate.
A preparation method of pervious concrete comprises the following steps:
(1) stirring the mixture and 1.3mol/L hydrochloric acid solution according to a mass ratio of 5:8 at 600r/min for 1h, filtering, collecting filter residues and filtrate, mixing the filtrate and 1.1mol/L sodium hydroxide solution according to a volume ratio of 5: 4 for 50min, uniformly stirring, standing for 2h, filtering, collecting filter cakes, and mixing the filter cakes and the filter residues to obtain a composite material;
(2) putting the composite material and the additive into a ball milling tank according to the mass ratio of 6:2, carrying out ball milling at 500r/min for 20min under the protection of nitrogen, collecting ball grinding materials, putting the ball grinding materials into a press, carrying out hot pressing at 85 ℃ and 280MPa for 20min, and collecting pressed materials;
(3) placing the pressed material into a calcining furnace, calcining for 2h at 1000 ℃, collecting the calcined material, placing the calcined material, water and an emulsifier into a reactor according to the mass ratio of 7:12:1, stirring for 30min at 600r/min, adding a mixture of 28% by mass of the calcined material, heating to 90 ℃, stirring for 40min, adding an initiator of 0.3% by mass of the calcined material, stirring and reacting for 8h, standing for 2h, filtering, washing a filter cake, drying, and collecting a dried substance;
(4) and (2) taking 160 parts of portland cement, 100 parts of a dry matter, 45 parts of quartz sand, 15 parts of pebbles and 4 parts of polycarboxylic acid high-efficiency water reducing agent according to parts by weight, and uniformly stirring to obtain the pervious concrete.
Example 3
The mixture is prepared by ball milling the aluminum ash, the fly ash and the blast furnace slag according to the mass ratio of 6:4:3, sieving, collecting sieved particles and obtaining the mixture.
The additive is prepared by uniformly mixing titanium hydride, sodium carbonate and a surfactant according to the mass ratio of 5:3: 0.3.
The surfactant is any one of alkylphenol polyoxyethylene and polyoxyethylene fatty acid ester.
The mixture is prepared by mixing 4-vinylpyridine and acrylamide according to the mass ratio of 5: 3.
The emulsifier is any one of xylitol anhydride monostearate and polyoxyethylene xylitol anhydride monostearate.
The initiator is any one of ammonium persulfate and sodium persulfate.
A preparation method of pervious concrete comprises the following steps:
(1) stirring the mixture and 1.3mol/L hydrochloric acid solution according to a mass ratio of 5:7 at 600r/min for 1h, filtering, collecting filter residues and filtrate, mixing the filtrate and 1.1mol/L sodium hydroxide solution according to a volume ratio of 5:3 for 50min, uniformly stirring, standing for 2h, filtering, collecting filter cakes, and mixing the filter cakes and the filter residues to obtain a composite material;
(2) putting the composite material and the additive into a ball milling tank according to the mass ratio of 25:1, carrying out ball milling at 500r/min for 20min under the protection of nitrogen, collecting ball grinding materials, putting the ball grinding materials into a press, carrying out hot pressing at 80 ℃ and 250MPa for 20min, and collecting pressed materials;
(3) placing the pressed material into a calcining furnace to calcine for 2h at 950 ℃, collecting the calcined material, placing the calcined material, water and an emulsifier into a reactor according to the mass ratio of 7:10:1, stirring for 30min at 600r/min, adding a mixture with the mass of 25% of the calcined material, heating to 90 ℃, stirring for 40min, adding an initiator with the mass of 0.2% of the calcined material, stirring and reacting for 8h, standing for 2h, filtering, washing a filter cake, drying, and collecting a dried substance;
(4) and (2) taking 120 parts of portland cement, 90 parts of a dry matter, 40 parts of quartz sand, 10 parts of pebbles and 3 parts of polycarboxylic acid high-efficiency water reducing agent by weight, and uniformly stirring to obtain the pervious concrete.
Comparative example 1
Essentially the same as in example 1, except that in step (1) the sodium hydroxide solution is absent.
Comparative example 2
Essentially the same as example 1, except that in step (2) the additive was absent.
Comparative example 3
Essentially the same as example 1, except that the mixture was absent in step (3).
Comparative example 4
According to the weight parts, 200 parts of portland cement, 60 parts of fly ash, 50 parts of blast furnace slag, 50 parts of quartz sand, 20 parts of pebbles and 5 parts of polycarboxylic acid high-efficiency water reducing agent are uniformly stirred to obtain the pervious concrete.
Mixing the pervious concrete in the embodiment and the comparative example with water according to the mass ratio of 3:1 to obtain pervious concrete mixture; filling the pervious concrete mixture into a mold in two layers; after each layer of the mould is filled, inserting and tamping the reinforcing steel bars with the diameter of 10mm for 25 times, and after the second layer of the mould is inserted and tamped, lightly vibrating and striking the side edge of the mould to ensure the compactness; after the insertion and tamping are finished, carrying out low-frequency vibrating on the top surface of the test piece for 10s by using a flat vibrator; and (3) placing the molded and formed specimen into a standard curing room (the temperature is 20 +/-2 ℃ and the relative humidity is more than 95%), removing the mold after 24 hours, and continuously placing the removed specimen into the standard curing room to be cured to the required age for subsequent tests.
The test is carried out according to the requirements of the test method of mechanical properties of ordinary concrete (GB/T50081-2002), and a hydraulic universal tester is adopted for testing the compressive strength of the standard test block at the age of 28 d.
The test adopts a water head fixing method introduced in technical regulations of permeable cement concrete pavements (CJJ/T135-2009) to determine the permeability coefficient of the permeable concrete, and test pieces with the sizes of 70mm multiplied by 70mm have the following detection results:
| example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 | Comparative example 3 | Comparative example 4 | |
| Compressive strength/MPa | 20.13 | 19.83 | 19.85 | 14.63 | 14.53 | 15.69 | 17.26 |
| Permeability factor/(mm/s) | 7.22 | 7.12 | 7.11 | 6.12 | 6.15 | 6.43 | 6.59 |
In conclusion, the pervious concrete prepared by the invention achieves better effect.
Claims (7)
1. The preparation method of the pervious concrete is characterized by comprising the following steps:
(1) stirring the mixture and a hydrochloric acid solution according to a mass ratio of 5: 7-9, filtering, collecting filter residues and a filtrate, mixing the filtrate and a sodium hydroxide solution according to a volume ratio of 5: 3-4, uniformly stirring, standing, filtering, collecting a filter cake, and mixing the filter cake and the filter residues to obtain a composite material;
(2) placing the composite material and the additive into a ball milling tank according to a mass ratio of 5-6: 1-3, carrying out ball milling under the protection of nitrogen, collecting ball grinding materials, placing the ball grinding materials into a press, carrying out hot pressing at 80-90 ℃ under 250-300 MPa, and collecting pressing materials;
(3) placing the pressed material into a calcining furnace for calcining, collecting a calcined material, placing the calcined material, water and an emulsifier into a reactor according to the mass ratio of 7: 10-13: 1 for stirring, then adding a mixture of 25-30% of the calcined material, heating and stirring, adding an initiator of 0.2-0.3% of the calcined material, stirring for reaction, standing, filtering, washing, drying, and collecting a dried substance;
(4) according to the weight parts, 120-200 parts of portland cement, 90-110 parts of a dry matter, 40-50 parts of quartz sand, 10-20 parts of pebbles and 3-5 parts of a polycarboxylic acid high-efficiency water reducing agent are uniformly stirred to obtain the pervious concrete.
2. The preparation method of the pervious concrete according to claim 1, wherein the mixture in the step (1) is prepared by ball-milling the aluminum ash, the fly ash and the blast furnace slag according to a mass ratio of 6: 4-5: 3, sieving, and collecting sieved particles.
3. The preparation method of the pervious concrete according to claim 1, wherein the additive in the step (2) is prepared by uniformly mixing titanium hydride, sodium carbonate and a surfactant according to a mass ratio of 5:3: 0.3-0.5.
4. The method for preparing pervious concrete according to claim 3, wherein the surfactant is any one of alkylphenol ethoxylates and fatty acid polyoxyethylene esters.
5. The method for preparing pervious concrete according to claim 1, wherein the mixture in step (3) is prepared by mixing 4-vinylpyridine and acrylamide according to a mass ratio of 5: 3.
6. The method for preparing pervious concrete according to claim 1, wherein the emulsifier in step (3) is any one of xylitol anhydride monostearate and polyoxyethylene xylitol anhydride monostearate.
7. The method for preparing pervious concrete according to claim 1, wherein the initiator in the step (3) is any one of ammonium persulfate and sodium persulfate.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116177934A (en) * | 2022-12-28 | 2023-05-30 | 佛山市南海科明达混凝土有限公司 | Self-compacting concrete and preparation method thereof |
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