CN114014584B - Reinforcing agent for high-strength impact-resistant and wear-resistant pervious concrete, and preparation method and application thereof - Google Patents
Reinforcing agent for high-strength impact-resistant and wear-resistant pervious concrete, and preparation method and application thereof Download PDFInfo
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
- C04B14/06—Quartz; Sand
- C04B14/062—Microsilica, e.g. colloïdal silica
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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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/281—Polyepoxides
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- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/282—Polyurethanes; Polyisocyanates
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- 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
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- 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
- C04B28/06—Aluminous cements
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- 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
- C04B28/06—Aluminous cements
- C04B28/065—Calcium aluminosulfate cements, e.g. cements hydrating into ettringite
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- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
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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
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/10—Coherent pavings made in situ made of road-metal and binders of road-metal and cement or like binders
- E01C7/14—Concrete paving
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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
- E01C7/00—Coherent pavings made in situ
- E01C7/08—Coherent pavings made in situ made of road-metal and binders
- E01C7/10—Coherent pavings made in situ made of road-metal and binders of road-metal and cement or like binders
- E01C7/14—Concrete paving
- E01C7/142—Mixtures or their components, e.g. aggregate
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- 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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- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
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- 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
Abstract
The invention discloses a reinforcing agent for high-strength impact-wear-resistant pervious concrete, the high-strength impact-wear-resistant pervious concrete and a preparation method and application thereof, wherein the reinforcing agent comprises the following raw materials in parts by weight: 8-10 parts of nano silicon dioxide powder, 20-25 parts of alumina ceramic microspheres, 18-22 parts of polypropylene imitation steel fibers, 15-20 parts of glass chopped fibers and 25-30 parts of water-based epoxy resin-polyurethane emulsion; the reinforcing agent can improve the strength, water permeability and abrasion and erosion resistance of the formed concrete.
Description
Technical Field
The invention belongs to the technical field of chemical building materials, and particularly relates to a reinforcing agent for high-strength impact-wear-resistant pervious concrete, the high-strength impact-wear-resistant pervious concrete, and a preparation method and application thereof.
Background
With the development of socio-economic and the progress of city construction, the earth surface of modern cities is gradually covered by reinforced concrete building and impervious pavement, compared with natural soil, the modern earth surface brings a series of problems to cities, which mainly appear in the following aspects: the water-tight road surface hinders the infiltration of rainwater for the rainwater is blocked to groundwater's replenishment, and in addition groundwater's excessive extraction, urban ground easily produces and sinks. The traditional compact road surface has large tire noise. Traditional urban road surface is waterproof construction, and the rainwater is got rid of through the way table, and the earial drainage ability is limited, and when meetting heavy rain or torrential rain, the rainwater collects on the road surface easily, concentrates on motor vehicle and bicycle way in a large number, leads to road surface ponding on a large scale. The appearance of concrete material that permeates water has solved above difficult problem, and it demonstrates outstanding infiltration, resistance to compression, environmental protection and pleasing to the eye colorful, comfortable and inhale sound noise reduction characteristics etc. at present along with the continuous popularization of sponge city construction, the application of concrete that permeates water is also more and more extensive.
The pervious concrete is also called porous concrete, sand-free concrete, and is a porous concrete formed by mixing aggregate, cement, admixture, water, admixture, pigment and the like, and the surface of the aggregate is coated with a thin layer of cement paste to be mutually bonded to form a honeycomb structure with uniformly distributed gaps, so the pervious concrete has the characteristics of air permeability, water permeability and the like, and the basic performance of the pervious concrete has two points: 1) Strength; 2) The two points of water permeability supplement each other and restrict each other. In order to ensure the water permeability index of the pervious concrete, the consumption of the cement cementing material is small, the interface connection between the slurry of the cement cementing material and the aggregate is mostly point contact, the cementing material at the interface is thinner, and the strength is just expressed by the action of the transmission force of the cementing points between the aggregates. The binding force between the cement paste and the aggregate mainly comes from the cross-linking effect of a paste-aggregate interface transition area, the area of a cementing point is increased, the mechanical meshing force between the paste and the aggregate and the compactness and the hydrophobic property of a cementing layer are improved, and the key of improving the erosion resistance of the water-permeable concrete is realized. Meanwhile, the improvement of the abrasion resistance and erosion resistance of the pervious concrete is a very important problem, and has important promotion significance on the development of pervious concrete technology.
How to ensure better water permeability while improving the strength and also have good abrasion and erosion resistance is a problem to be solved by the pervious concrete.
Disclosure of Invention
The invention aims to provide a reinforcing agent for high-strength abrasion-resistant pervious concrete and a preparation method thereof, wherein the reinforcing agent can improve the strength, the water permeability and the abrasion and erosion resistance of the concrete after molding.
The invention also aims to provide the high-strength abrasion-resistant pervious concrete and the preparation method and application thereof, and the high-strength abrasion-resistant pervious concrete has high strength, good water permeability and good abrasion, erosion and corrosion resistance after being formed.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the hydroxyl-increasing agent for the high-strength impact-resistant and wear-resistant pervious concrete comprises the following raw materials in parts by weight: 8-10 parts of nano silicon dioxide powder, 20-25 parts of alumina ceramic microspheres, 18-22 parts of polypropylene imitation steel fibers, 15-20 parts of glass chopped fibers and 25-30 parts of waterborne polyurethane-epoxy resin emulsion.
The preparation method of the reinforcing agent comprises the following steps:
(1) Adding the nano silicon dioxide powder, the alumina ceramic microspheres, the polypropylene imitation steel fibers and the glass chopped fibers into an acetone solution of a titanate coupling agent according to the formula ratio, uniformly stirring, and then drying;
(2) And (2) putting the mixture treated in the step (1) and the polyurethane-epoxy resin emulsion with the formula amount into a high-speed dispersion machine and stirring the mixture and the polyurethane-epoxy resin emulsion until the mixture and the polyurethane-epoxy resin emulsion are uniform.
The dosage of the acetone solution of the titanate coupling agent is 15-20% of the total weight of the nano silicon dioxide powder, the alumina ceramic microspheres, the polypropylene imitation steel fibers and the glass chopped fibers; in the acetone solution of the titanate coupling agent, the mass concentration of the titanate coupling agent is 0.8-1.5%.
The stirring speeds in the steps (1) and (2) are 800-1000r/min and 2000-3000r/min respectively.
The high-strength anti-impact and anti-wear pervious concrete comprises the following raw materials in parts by weight: 300-400 parts of cement, 50-60 parts of fly ash, 1300-1500 parts of coarse aggregate, 40-50 parts of reinforcing agent, 80-100 parts of water, 0.3-0.5 part of retarder and 5-7 parts of water reducing agent.
The cement is any one or more of portland cement, aluminate cement or sulphoaluminate cement; preferably portland cement; the portland cement is P.O 42.5.5 ordinary portland cement or P.O 52.5.5 ordinary portland cement.
The fly ash is one or two of first-grade fly ash and second-grade fly ash.
The coarse aggregate is single-stage crushed stone with the grain diameter of 10-15mm, and the mud content of the coarse aggregate is less than 0.5 percent.
The retarder is any one or more of sodium gluconate, white sugar and citric acid.
The water reducing agent is a polycarboxylic acid water reducing agent.
The preparation method of the high-strength anti-abrasion pervious concrete comprises the following steps: adding the cement, the fly ash, the coarse aggregate, the reinforcing agent and the retarder with the formula ratio into a concrete mixer for premixing; and adding water and a water reducing agent in a formula amount while stirring, stirring uniformly, and discharging.
The pre-mixing time is 2-5 min; the mixing time is 3-6min.
The invention also provides application of the high-strength impact-abrasion-resistant pervious concrete in preparation of high-strength impact-abrasion-resistant pervious pavements.
Compared with the prior art, the invention has the beneficial effects that:
(1) The high-strength impact-resistant and wear-resistant reinforcing agent for pervious concrete is prepared from fillers such as polypropylene imitation steel fibers, glass chopped fibers, nano silicon dioxide powder and alumina ceramic microspheres and a polyurethane-epoxy resin emulsion, wherein the fillers are pretreated by a titanate coupling agent in advance before being added so as to improve the dispersibility. The fiber treated by the titanate coupling agent, the powdery and spherical filler can form a good dispersion phase in the polyurethane-epoxy resin emulsion, the prepared reinforcing agent is finally uniformly dispersed in the concrete to form a unique compact three-dimensional network structure, and the powdery and spherical filler is distributed in gaps between the fiber and the fiber to generate a synergistic effect and be lapped into a cross-linked colloid framework, so that the strength of the concrete is greatly improved by distribution in a cement matrix, and the scouring resistance of the concrete is also improved due to the formation of the compact three-dimensional network structure.
The reinforcing agent for the high-strength impact-resistant pervious concrete provided by the invention has the advantages that the compressive strength of the pervious concrete is improved, and meanwhile, the durability of the pervious concrete can be improved through the organic-inorganic composite fiber material, so that the pervious concrete is not easy to crack after being formed, and the service life of the pervious concrete is prolonged;
by adding the waterborne polyurethane-epoxy resin emulsion into the reinforcing agent for the high-strength impact-resistant pervious concrete, the characteristics of high rigidity and adhesive force of epoxy resin and the like are kept, the flexibility and the wear resistance of polyurethane are introduced, the adhesive force of each filler in the concrete and the surface of cement is favorably enhanced, the toughness of the material is improved, and the integral integrity of the material can be kept when the pervious concrete is washed by water for a long time.
The reinforcing agent for the high-strength impact-resistant and wear-resistant pervious concrete is added with the nano silicon dioxide powder, and the nano silicon dioxide powder has a certain filtering capacity, so that the water permeability of the pervious concrete is enhanced as the nano silicon dioxide powder has a size effect which is favorable for improving the compressive strength of the pervious concrete, and the pervious concrete is not easy to crack: the main component of the nano silicon dioxide is silicon dioxide, hydroxyl groups easily exist on the surface of the silicon dioxide without hydrophobic treatment, and the hydroxyl groups on the surface of the silicon dioxide also have stronger polarity, are easy to dehydrate and condense with silanol formed by hydrolysis of a silane coupling agent and hydroxyl groups on the surface of portland cement, so that a molecular chain is longer, and the formation of a cross-linked network is facilitated.
(2) The concrete prepared by using the reinforcing agent for the high-strength abrasion-resistant pervious concrete has high strength, good water permeability and good abrasion and erosion resistance after being formed.
(3) The reinforcing agent for the high-strength impact-wear-resistant pervious concrete and the reinforcing agent for the high-strength impact-wear-resistant pervious concrete provided by the invention are simple in preparation process, excellent in performance and suitable for popularization and application.
Detailed Description
The present invention will be described in detail with reference to examples.
The cement in the examples and the comparative examples is P.O42.5 sea snail cement produced by Hunan Shimen; the fly ash is grade II fly ash produced by Xiangyang power plant; the water reducer is a PC150 polycarboxylic acid water reducer produced by a new material of the Xiangyang sea snail; the nano silicon dioxide powder is selected from the model CW-001 of Shanghai Chaowei nano science and technology Limited; the alumina ceramic microspheres are produced by Zibo Yichi ceramic new material Limited company and have the diameter of 1mm; the polypropylene imitation steel fiber is produced by Taian same semi-fiber company; the glass chopped fiber is produced by a giant rock group, and the model is 534A; the water-based polyurethane-epoxy resin emulsion is produced by Vast Hexion of America, and the model is 5520-w-60A; the test temperature is 25 ℃, and the test humidity is 80%; concrete curing conditions: the temperature is 20 +/-2 ℃, and the humidity is more than or equal to 95 percent.
Example 1
The high-strength anti-impact wear pervious concrete is prepared from the following components in parts by mass: 80 parts of water, 300 parts of P.O 42.5.5 portland cement, 50 parts of fly ash, 1300 parts of crushed stone, 40 parts of reinforcing agent, 5 parts of polycarboxylic acid water reducing agent and 0.3 part of sodium gluconate.
The reinforcing agent is prepared from the following components in parts by mass: 8 parts of nano silicon dioxide powder, 20 parts of alumina ceramic microspheres, 20 parts of polypropylene imitation steel fibers, 15 parts of glass chopped fibers and 30 parts of waterborne polyurethane-epoxy resin emulsion; the preparation method comprises the following steps: adding the nano silicon dioxide powder, the alumina ceramic microspheres, the polypropylene imitation steel fibers and the glass chopped fibers in the formula ratio into 15 parts of acetone solution of titanate coupling agent with the mass concentration of 1%, uniformly stirring at 800r/min, and then putting into an oven at 100 ℃ for drying; and (3) putting the dried mixture and the epoxy resin-polyurethane emulsion with the formula amount into a high-speed dispersion machine, and stirring for 1.5 hours at the rotating speed of 2500 r/min.
The preparation method of the high-strength anti-abrasion pervious concrete comprises the following steps:
(1) Adding 300 parts of portland cement, 50 parts of fly ash, 1300 parts of broken stone, 40 parts of reinforcing agent and 0.3 part of sodium gluconate into a concrete mixer at the normal temperature and at the rotating speed of 50r/min for stirring for 2 minutes;
(2) And adding 80 parts of water and 5 parts of polycarboxylic acid water reducing agent while stirring, stirring for 3 minutes, and discharging.
Example 2
The high-strength anti-impact wear pervious concrete is prepared from the following components in parts by mass: 90 parts of water, 350 parts of P.O 42.5.5 portland cement, 55 parts of fly ash, 1400 parts of gravel, 55 parts of reinforcing agent, 6 parts of polycarboxylic acid water reducing agent and 0.3 part of citric acid.
The reinforcing agent is prepared from the following components in parts by mass: 10 parts of nano silicon dioxide powder, 22 parts of alumina ceramic microspheres, 20 parts of polypropylene imitation steel fibers, 20 parts of glass chopped fibers and 28 parts of waterborne polyurethane-epoxy resin emulsion; the preparation method comprises the following steps: adding the nano silicon dioxide powder, the alumina ceramic microspheres, the polypropylene imitation steel fibers and the glass chopped fibers in the formula ratio into 18 parts of acetone solution of titanate coupling agent with the mass concentration of 1%, uniformly stirring at 800r/min, and then putting into a 100 ℃ drying oven for drying; and (3) putting the dried mixture and the epoxy resin-polyurethane emulsion with the formula amount into a high-speed dispersion machine, and stirring for 1.5 hours at the rotating speed of 2500 r/min.
The preparation method of the high-strength anti-impact and anti-wear pervious concrete comprises the following steps:
(1) In a concrete mixer, at normal temperature and at a rotating speed of 50r/min, 350 parts of portland cement, 55 parts of fly ash, 1400 parts of crushed stone, 55 parts of reinforcing agent and 0.3 part of citric acid are added and stirred for 2 minutes;
(2) Adding 90 parts of water and 6 parts of polycarboxylic acid water reducing agent while stirring, stirring for 3 minutes and discharging.
Example 3
The high-strength impact-resistant and wear-resistant permeable concrete is prepared from the following components in parts by mass: 100 parts of water, 400 parts of P.O 42.5.5 portland cement, 60 parts of fly ash, 1500 parts of broken stone, 50 parts of reinforcing agent, 7 parts of polycarboxylic acid water reducing agent and 0.5 part of white sugar.
The reinforcing agent is prepared from the following components in parts by mass: 10 parts of nano silicon dioxide powder, 22 parts of alumina ceramic microspheres, 20 parts of polypropylene imitation steel fibers, 20 parts of glass chopped fibers and 28 parts of waterborne polyurethane-epoxy resin emulsion; the preparation method comprises the following steps: adding the nano silicon dioxide powder, the alumina ceramic microspheres, the polypropylene imitation steel fibers and the glass chopped fibers into 20 parts of acetone solution of titanate coupling agent with the mass concentration of 1% to be uniformly stirred at the speed of 800r/min, and then putting the mixture into an oven at the temperature of 100 ℃ for drying; and (3) putting the dried mixture and the epoxy resin-polyurethane emulsion with the formula amount into a high-speed dispersion machine, and stirring for 1.5 hours at the rotating speed of 2500 r/min.
The preparation method of the high-strength anti-abrasion pervious concrete comprises the following steps:
(1) Adding 400 parts of portland cement, 60 parts of fly ash, 1500 parts of broken stone, 50 parts of reinforcing agent and 0.5 part of white sugar into a concrete mixer at the normal temperature and at the rotating speed of 50r/min, and stirring for 2 minutes;
(2) Adding 100 parts of water and 7 parts of water reducing agent while stirring, stirring for 3 minutes and discharging.
Comparative example 1
The pervious concrete is prepared from the following components in parts by mass: 80 parts of water, 300 parts of Portland cement (P.O 42.5.5), 50 parts of fly ash, 1300 parts of crushed stone, 5 parts of polycarboxylic acid water reducing agent and 0.3 part of sodium gluconate.
The preparation method of the pervious concrete comprises the following steps:
(1) Adding 300 parts of portland cement, 50 parts of fly ash, 1300 parts of crushed stone and 0.3 part of sodium gluconate into a concrete mixer at the normal temperature and at the rotating speed of 50r/min for stirring for 2 minutes;
(2) Adding 80 parts of water and 5 parts of polycarboxylic acid water reducing agent while stirring, stirring for 3 minutes and discharging;
in comparison with example 1, this comparative example was carried out without adding a reinforcing agent, and the rest was the same as example 1.
Comparative example 2
In contrast to example 1, the reinforcing agent component of this comparative example was the same as example 1 except that no nano-silica powder was added.
Namely, the reinforcing agent is prepared from the following components in parts by mass: 20 parts of alumina ceramic microspheres, 20 parts of polypropylene imitation steel fibers, 15 parts of glass chopped fibers and 30 parts of waterborne polyurethane-epoxy resin emulsion.
Comparative example 3
In contrast to example 1, the reinforcing agent component of this comparative example was not provided with alumina ceramic microspheres, and the rest was the same as example 1.
Namely, the reinforcing agent is prepared from the following components in parts by mass: 8 parts of nano silicon dioxide powder, 20 parts of polypropylene imitation steel fiber, 15 parts of glass chopped fiber and 30 parts of waterborne polyurethane-epoxy resin emulsion.
Comparative example 4
In contrast to example 1, the reinforcing agent component of this comparative example was not poly-propylene imitation steel fibers and glass chopped fibers, otherwise the same as example 1.
Namely, the reinforcing agent is prepared from the following components in parts by mass: 8 parts of nano silicon dioxide powder, 20 parts of alumina ceramic microspheres and 30 parts of waterborne polyurethane-epoxy resin emulsion.
Comparative example 5
In contrast to example 1, the reinforcing agent component of this comparative example is not supplemented with a waterborne polyurethane-epoxy resin emulsion, and the rest is the same as example 1.
Namely, the reinforcing agent is prepared from the following components in parts by mass: 8 parts of nano silicon dioxide powder, 20 parts of alumina ceramic microspheres, 20 parts of polypropylene imitation steel fibers and 15 parts of glass chopped fibers.
Performance test
The pervious concrete prepared in the above examples and comparative examples is filled into a mold of 150mm × 150mm × 150mm to prepare a molding, and the mold is removed after curing for 2-3 days.
Putting a part of test blocks in each group of examples into water flow for flushing (flushing mode: continuous water flow flushing for 4 days, stopping for 3 days, and repeating continuously to determine the quality loss condition of the pervious concrete); putting the other part of test blocks into a natural environment for maintenance; according to CJJ/T135-2009 technical Specification for permeable cement concrete pavement, the compressive strength and the flexural strength as well as the permeability coefficient of the permeable cement concrete pavement are respectively measured at 7d and 28d under the two conditions of water flow scouring and natural maintenance:
1. compressive strength and bending strength: testing according to GB/T50081-2002 standard of common concrete mechanical property test method;
2. porosity: soaking the cubic test block in water for 24h, testing the mass m1 of each test sample after soaking, then air-drying each test sample, testing the mass m2 of each test sample, and calculating the porosity P of the concrete test block according to the following formula, wherein P = [1- (m 2-m 1)/V × ρ ] × 100%, and the formula is as follows: v is the volume of the cubic test block, and rho is the density of water;
3. water permeability coefficient: testing according to a fixed water level height method; the abrasion resistance (pit length) was measured in accordance with GB/T12988-2009 abrasion resistance test method for inorganic floor materials.
The test results are shown in tables 1 and 2 below:
TABLE 1 test results of strength, water permeability and porosity of pervious concrete
TABLE 2 testing results of the wear resistance of pervious concrete
| Grinding pit length (mm) | Mass loss (%) | |
| Example 1 | 9 | 1.2 |
| Example 2 | 10 | 1.3 |
| Example 3 | 9 | 1.2 |
| Comparative example 1 | 35 | 5.8 |
| Comparative example 2 | 23 | 4.3 |
| Comparative example 3 | 25 | 4.4 |
| Comparative example 4 | 24 | 4.4 |
| Comparative example 5 | 28 | 4.8 |
As can be seen from Table 1, in the comparative example, the compression strength and the rupture strength of the test blocks 7d and 28d which are washed by water flow are obviously reduced compared with those under natural maintenance; in the embodiment, the compression strength and the bending strength of the test blocks 7d and 28d under water flow washing are not basically kept unchanged. Comparing examples 1-3 with comparative examples 1-5, it can be seen that when no reinforcing agent is added or a reinforcing agent is added, but a certain component in the reinforcing agent is reduced, the water permeability, strength and wear resistance of the pervious concrete are deteriorated, and the compressive strength and breaking strength of the pervious concrete under water impact are obviously reduced compared with those under natural curing, which shows that the components of the nano powder, the spherical ceramic particles, the organic-inorganic fibers and the resin emulsion in the reinforcing agent have synergistic effect and can only play a role when simultaneously existing, and the performance of a certain component is obviously reduced in the absence of the component. As can be seen from table 2, the abrasion resistance of the examples was improved by 65% or more on average as compared with the comparative examples. Therefore, the high-strength anti-impact wear-resistant pervious concrete prepared by the method can well improve the impact resistance and wear resistance of the pervious concrete, and further prolong the service life of the pervious concrete.
The above detailed description of a reinforcing agent for high strength erosion and abrasion resistant pervious concrete, a method for preparing the same, and applications thereof, with reference to the examples, is illustrative and not restrictive, and several examples may be cited within the scope of the present invention, so that variations and modifications thereof may be made without departing from the general inventive concept within the scope of the present invention.
Claims (8)
1. The high-strength anti-impact wear pervious concrete is characterized by comprising the following raw materials in parts by weight: 300-400 parts of cement, 50-60 parts of fly ash, 1300-1500 parts of coarse aggregate, 40-50 parts of reinforcing agent, 80-100 parts of water, 0.3-0.5 part of retarder and 5-7 parts of water reducing agent;
the reinforcing agent comprises the following raw materials in parts by weight: 8-10 parts of nano silicon dioxide powder, 20-25 parts of alumina ceramic microspheres, 18-22 parts of polypropylene imitation steel fibers, 15-20 parts of glass chopped fibers and 25-30 parts of waterborne polyurethane-epoxy resin emulsion;
the preparation method of the reinforcing agent comprises the following steps:
(1) Adding the nano silicon dioxide powder, the alumina ceramic microspheres, the polypropylene imitation steel fibers and the glass chopped fibers into an acetone solution of a titanate coupling agent according to the formula ratio, uniformly stirring, and then drying;
(2) And (2) putting the mixture treated in the step (1) and the polyurethane-epoxy resin emulsion with the formula amount into a high-speed dispersion machine and stirring the mixture and the polyurethane-epoxy resin emulsion until the mixture and the polyurethane-epoxy resin emulsion are uniform.
2. The high-strength impact-resistant and wear-resistant pervious concrete as claimed in claim 1, wherein the amount of the acetone solution of the titanate coupling agent is 15-20% of the total weight of the nano silica powder, the alumina ceramic microspheres, the polypropylene steel-like fibers and the glass chopped fibers; in the acetone solution of the titanate coupling agent, the mass concentration of the titanate coupling agent is 0.8-1.5%.
3. The high-strength anti-abrasion pervious concrete according to claim 1, wherein the stirring speeds in steps (1) and (2) are 800-1000r/min and 2000-3000r/min, respectively.
4. The high-strength impact-resistant and wear-resistant pervious concrete according to any one of claims 1 to 3, wherein the coarse aggregate is crushed stone with a single-stage formula particle size of 10 to 15mm and has a mud content of less than 0.5%.
5. The high-strength impact-resistant and wear-resistant pervious concrete according to any one of claims 1 to 3, wherein the retarder is any one or more of sodium gluconate, white sugar and citric acid.
6. The high-strength impact-and-wear-resistant pervious concrete according to any one of claims 1 to 3, wherein the water reducing agent is a polycarboxylic acid water reducing agent.
7. The method for preparing high-strength impact and abrasion resistant pervious concrete according to any one of claims 1 to 6, characterized in that the preparation method comprises the following steps: adding the cement, the fly ash, the coarse aggregate, the reinforcing agent and the retarder with the formula ratio into a concrete mixer for premixing; and adding water and a water reducing agent in a formula amount while stirring, stirring uniformly, and discharging.
8. Use of the high-strength impact-and-wear-resistant pervious concrete as claimed in any one of claims 1 to 6 for preparing a high-strength impact-and-wear-resistant pervious pavement.
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