CN110590283A - Preparation method of thin-layer blockage-dredging water-permeable product - Google Patents
Preparation method of thin-layer blockage-dredging water-permeable product Download PDFInfo
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- CN110590283A CN110590283A CN201910914907.1A CN201910914907A CN110590283A CN 110590283 A CN110590283 A CN 110590283A CN 201910914907 A CN201910914907 A CN 201910914907A CN 110590283 A CN110590283 A CN 110590283A
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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
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/10—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B26/14—Polyepoxides
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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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- 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
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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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
A preparation method of a thin-layer blockage-dredging water-permeable product. The invention aims to change the current blocking situation of pervious concrete, improve the rapid accumulation of blocking objects in the using process of the pervious concrete and maintain the water permeability of the pervious concrete. The surface layer mixing proportion is as follows: 10-20 parts of superfine sand, 3-10 parts of polyurethane epoxy, 0.01-0.15 part of diluent, 0.01-0.15 part of dispersant and 0.01-0.15 part of surfactant. The base layer comprises the following components in percentage by weight: 20-30 parts of cement, 5-8 parts of water, 60-150 parts of aggregate, 0.08-0.15 part of water reducing agent, 0.5-0.8 part of lotus leaf hydrophobing agent, 0.02-0.04 part of cellulose ether, 0.5-0.8 part of reinforcing agent, 1-3 parts of metakaolin and 1-3 parts of silica fume. The method comprises the following steps: adding semi-water into base aggregate in a stirrer, stirring for 30-60s, adding a cementing material, a water reducing agent, a reinforcing agent and the rest water, stirring for 30-90s, scraping the mixture in the stirrer, stirring again, stirring the surface layer ultrafine sand, resin, a diluent, a dispersing agent and a curing agent, weighing a certain mass of the base layer mixture, inserting the mixture into a mold for 2-3 times, adding a certain mass of the surface layer mixture into the mold again, performing compression molding for 3-10s by adopting the pressure within the range of 1-15MPa, and naturally curing for 6 hours.
Description
Technical Field
The invention relates to the field of building materials, in particular to a preparation method of a thin-layer blockage-dredging water-permeable product.
Background
Along with the construction of sponge cities, pervious concrete is produced. With the large-scale application of the pervious concrete, the harm brought by the cement concrete is changed, and the method plays an important role in resource waste, environmental pollution and energy loss. However, with the increase of the service life of the pervious concrete, particles such as fine sand, gravel, clay and the like carried by surface runoff can enter pores of the pervious concrete pavement along with water flow, so that blockage is caused, the drainage function of the pervious concrete pavement is reduced, the water permeability of the pervious concrete is greatly reduced, and even the water permeability is completely lost. The permeability of the pervious concrete is reduced due to the blockage of the pores, so that the pervious concrete is developed into a non-pervious pavement, the function of the pervious concrete pavement is difficult to play, and urban flood and freeze-thaw disasters are caused. However, there is no absolute anti-blocking pervious concrete, so a pervious product with the performance of dredging blocking is developed, the service time is prolonged, and the resource waste is reduced.
Compared with common pervious concrete, the thin-layer dredging and plugging pervious product not only has the excellent service performances of permeating water, permeating air, absorbing sound and reducing noise, protecting underground water resources, relieving urban heat island effect, improving soil ecological environment and the like by virtue of the structure of the thin-layer dredging and plugging pervious product, but also can block most of pollutants such as stones, sand, dust, fallen leaves and the like, and can permeate into the pervious product for plugs with superfine particle diameters to enter underground water runoff along with water flow, so that the service time of the pervious product is prolonged.
The thin-layer blockage-dredging water-permeable product adopts the base layer and the surface layer with different porosities, and the surface layer forms a more compact thin-layer microporous structure, so that the thin-layer blockage-dredging water-permeable product has excellent effects of water permeability and blockage dredging. The surface layer is formed by mixing polyurethane modified epoxy composite polymer and fine sand, and the polyurethane modified epoxy composite polymer is a novel non-toxic organic polymer and has good working performance. In the using process of the polyurethane modified epoxy composite polymer, the compressive strength, the tensile strength, the elongation and the elasticity of the surface layer can be adjusted in a large range by changing the mixing amount of the polymer. The surface layer is prepared by stirring fine sand, polyurethane modified epoxy, a diluent and a dispersing agent, so that the pore structure is more compact, through micropores are formed, the thickness of the surface layer is 1-5mm, the pore size is generally controlled to be 0.005-0.3mm, and the surface layer has good water permeability and plugging removal performance. The base layer is a high-performance permeable product prepared by stirring aggregate, cement, a water reducing agent, metakaolin, a reinforcing agent, silica fume, an additive and the like, and has a series of excellent performances such as high strength, large pore diameter, good water permeability and the like.
Disclosure of Invention
The invention aims to change the current situation of blockage of the pervious concrete, solve the problem of rapid accumulation of a blockage in the use process of the pervious concrete and maintain the water permeability of the pervious concrete. Researches find that coarse sand particles can hardly invade to the middle part of the permeable pavement structure layer in the blocking process, and fine sand can penetrate through the whole permeable pavement structure layer. The uppermost layer (0-10mm) of the permeable pavement is most seriously blocked, and the lower layer is lighter towards the lower layer, so that the lowermost layer is hardly blocked. The greater the porosity, the more likely the larger particles will clog, while the smaller particles will be relatively less likely to clog. Under the condition of adding the full-graded sand, the mass of particles blocked in the pervious concrete test piece is the most, the blockage of pores is dense, and after the pore channels of the test piece are blocked by thicker particles in the full-graded sand, the pore size is reduced, and the thinner particles are continuously filled in the reduced pores, so that the sand particles contained in the through pores of the pervious concrete are the most, and the blockage is the most serious. Therefore, the surface of the invention adopts a thin-layer fine sand surface layer, so that most of the blockage is intercepted on the surface, the blockage with ultra-small grain diameter enters the base layer through the pores, and the hydrophobic substance is added into the base layer, so that the fine sand with ultra-small grain diameter and the soil can not be bonded in the concrete of the base layer and can permeate underground along with water flow, which is equivalent to that the blockage is separated into single gradation by adopting an artificial mode. The thin-layer dredging and blocking permeable product is adopted, so that the permeable problem of the permeable product can be solved, the service time of the permeable product can be prolonged, the energy is saved, the emission is reduced, the use of cement products is reduced, and the pollution is reduced.
The technical route of the invention is as follows:
a preparation method of a thin-layer blockage-dredging water-permeable product is characterized by comprising a water-permeable concrete surface layer and a water-permeable concrete base layer. The surface layer mixing proportion is as follows: 10-20 parts of superfine sand, 3-10 parts of polyurethane epoxy, 0.01-0.15 part of diluent, 0.01-0.15 part of dispersant and 0.01-0.15 part of surfactant; the base layer comprises the following components in percentage by weight: 20-30 parts of cement, 5-8 parts of water, 60-150 parts of aggregate, 0.08-0.15 part of water reducing agent, 0.5-0.8 part of lotus leaf hydrophobing agent, 0.02-0.04 part of cellulose ether, 0.5-0.8 part of reinforcing agent, 1-3 parts of metakaolin and 1-3 parts of silica fume.
The grain size of the ultrafine sand in the surface layer mixing proportion is 0.075-2.36mm river sand, and the bulk density is 1250kg/m3Wherein the fullerene index of the discontinuous grading is in the range of 0.33-0.5.
The polymer is polyurethane modified epoxy resin building structural adhesive.
The diluent is ethyl acetate.
The dispersant is a solvent-free wetting dispersant, and the component is high molecular weight ammonium salt copolymer.
The surfactant is an alkynol surfactant.
The hydrophobic agent is a lotus leaf hydrophobic agent, is a non-ionic microemulsion, and is prepared by compounding various waxes and emulsifiers. The cement is 42.5 or 52.5 ordinary portland cement.
The water is tap water.
The base aggregate is limestone macadam, basalt macadam, cobblestone macadam or ceramsite with the thickness of 2-5mm, 5-10mm and 10-20 mm.
The target porosity of the base layer is 10-30%, and the using amount of the aggregate is 1400-1650 kg/m3. The water reducing agent is a naphthalene water reducing agent or a polycarboxylic acid water reducing agent.
The cellulose ether is hydroxypropyl cellulose ether.
The particle size of the metakaolin particles is mainly distributed in 400-1100 mu m.
The specific surface area of the silica fume is 300-400kg/m2The average particle size was 14 μm.
The reinforcing agent is SiO-containing2Polymers synthesized with special functional monomers.
The preparation method of the thin layer blocking-dredging water permeable product comprises the following steps
Step 1: preparing a certain weight of aggregate, a cementing material, a reinforcing agent, water and a water reducing agent for later use.
Step 2: adding semi-water into the base aggregate in a stirrer and stirring for 30-60 s.
And step 3: adding the cementing material, the water reducing agent, the reinforcing agent and the rest water into a stirrer, and stirring for 30-90 s.
And 4, step 4: and scraping the mixture in the stirrer by using a shovel, and stirring again.
And 5: and (3) placing the superfine sand with surface layer discontinuous gradation, the polyurethane modified epoxy resin, the diluent, the dispersant and the curing agent into a stirrer for stirring.
Step 6: and (2) weighing a certain weight of base layer mixture, inserting the mixture into a mold in a layering manner for 2-3 times, putting a certain weight of surface layer mixture into the mold again, performing one-step compression molding for 3-10s by adopting a molding pressure within the range of 1-15MPa, and naturally curing for 6 hours to obtain the thin-layer blockage-dredging pervious concrete.
The method comprises the steps of simulating rainfall blockage in a laboratory, screening and reserving blockage with the particle size of 1.18mm or less by adopting natural outdoor silt, using the average total suspended sediment concentration of 100-250mg/L, scraping floating sand on a surface layer after a blockage test, cleaning by using a water gun, putting a test piece into an oven for drying, and sequentially carrying out the circulation for 5 times to test the water permeability coefficient.
Compared with the prior art, the invention has the advantages that:
(1) compared with single polymer, the polyurethane modified epoxy resin building structural adhesive has the advantages of low cost, good cold and hot shock resistance and toughness, and excellent strength and aging resistance.
(2) The surface layer is formed by directly mixing fine sand and a polymer, the pore structure is more compact, a thin surface layer is adopted, the thickness is about 1-5mm, a similar thin surface net is formed, the pore diameter is 0.005-0.3mm, the blockage of granular substances with the particle size larger than 0.3mm can be blocked, and a surfactant is adopted to change the hydrophobic effect of the resin surface layer.
(3) The base layer is made of cement, cellulose riddle, reinforcing agent, water reducing agent, metakaolin and silica fume to form a matrix slurry material, and the lotus leaf hydrophobic material is added to form a large-pore permeable concrete base layer.
(4) The thin layer surface layer is adopted to form a thin layer net surface, the pore structure of the thin layer net surface is similar to a vertical type, the tortuosity of the pore structure of the common anti-blocking permeable concrete is reduced, and the surface layer can not be peeled off. The granular substances with different particle sizes are separated to block the granular substances with large particle sizes, and the granular substances with small particle sizes penetrate through the surface layer to enter the hydrophobic permeable concrete base layer, so that the granular substances cannot stay on the base layer and enter the underground water along with water flow. Wherein, a small amount of the retention plugs are cleaned by pressure water, and good water permeability can be recovered.
(5) This experiment adopts basic unit's mixture and surface course mixture to stir simultaneously, and the mode of 2 times pan feeding, one shot forming guarantees permeable product's lasting water permeability and higher mechanical properties simultaneously.
Detailed Description
Example 1
The surface layer is made of 0.15-2.36mm superfine sand with discontinuous gradation, the fullerene index is 0.4 and 20 parts, the using amount of polyurethane modified epoxy is 10 parts, the diluent is 0.15 part, the dispersant is 0.1 part, the surfactant is 0.15 part, and the thickness of the surface layer is 5 mm. The base layer is composed of 30 parts of cement, 150 parts of aggregate which is made of 5-10mm natural macadam, 8 parts of water, 3 parts of metakaolin, 3 parts of silica fume, 0.15 part of water reducing agent, 0.8 part of lotus leaf hydrophobing agent, 0.04 part of cellulose ether and 0.8 part of reinforcing agent, and the cement, the aggregate and the water are stirred and formed according to the process. Naturally curing for 6 hours for later use. The compressive strength of the product is 35MPa, the splitting tensile strength is 4.3MPa, the water permeability coefficient is 7mm/s, the freezing resistance grade is D25, the internal plug retention of 5 plugging circulating test pieces is 5%, the internal plug retention is 4%, and the water permeability coefficient is 5.7 mm/s.
Example 2
The surface layer is made of 0.075-0.15mm single-grade superfine sand 20 parts, 10 parts of polyurethane modified epoxy, 0.15 part of diluent, 0.1 part of dispersant, 0.15 part of surfactant and 3mm of surface layer thickness. The base layer is composed of 30 parts of cement, 150 parts of aggregate which is made of 5-10mm natural macadam, 8 parts of water, 3 parts of metakaolin, 3 parts of silica fume, 0.15 part of water reducing agent, 0.8 part of lotus leaf hydrophobing agent, 0.04 part of cellulose ether and 0.8 part of reinforcing agent, and the cement, the aggregate and the water are stirred and formed according to the process. Naturally curing for 6 hours for later use. The compressive strength of the product is 36MPa, the splitting tensile strength is 4.9MPa, the water permeability coefficient is 5.5mm/s, the freezing resistance grade is D23, the internal plug retention amount of 5 plugging circulation test pieces is 3%, the test pieces are cleaned by pressure water, the internal plug retention amount is 1%, and the water permeability coefficient is 5.4 mm/s.
Example 3
The surface layer is made of 0.15-0.3mm single-grade superfine sand 20 parts, 10 parts of polyurethane modified epoxy, 0.15 part of diluent, 0.1 part of dispersant, 0.15 part of surfactant and 3mm in thickness. The base layer is composed of 30 parts of cement, 150 parts of aggregate which is made of 5-10mm natural macadam, 8 parts of water, 3 parts of metakaolin, 3 parts of silica fume, 0.15 part of water reducing agent, 0.8 part of lotus leaf hydrophobing agent, 0.04 part of cellulose ether and 0.8 part of reinforcing agent, and the cement, the aggregate and the water are stirred and formed according to the process. Naturally curing for 6 hours for later use. The product has the compression strength of 40MPa, the splitting tensile strength of 4.5MPa, the water permeability coefficient of 6mm/s and the frost resistance grade of D23. The internal blockage retention amount of 5 blockage circulation test pieces is 4%, the test pieces are cleaned by pressure water, the internal blockage retention amount is 3%, and the water permeability coefficient is 5.6 mm/s.
Claims (5)
1. A preparation method of a thin-layer blockage-dredging water-permeable product is characterized by comprising a water-permeable surface layer and a water-permeable concrete base layer. The surface layer mixing proportion is as follows: 10-20 parts of superfine sand; 3-10 parts of polyurethane epoxy; 0.01-0.15 part of diluent; 0.01-0.15 part of dispersant and 0.01-0.15 part of surfactant; the base layer comprises the following components in percentage by weight: 20-30 parts of cement, 5-8 parts of water, 60-150 parts of aggregate, 0.08-0.15 part of water reducing agent, 0.5-0.8 part of lotus leaf hydrophobing agent, 0.02-0.04 part of cellulose ether, 0.5-0.8 part of reinforcing agent, 1-3 parts of metakaolin and 1-3 parts of silica fume.
2. The method for preparing the thin-layer blockage-dredging water permeable product according to claim 1, wherein the surface layer is prepared from river sand with the ultrafine sand grain size of 0.075-2.36mm and the bulk density of 1250kg/m3The fullerene index range of the discontinuous grading is 0.33-0.5, the polymer is polyurethane modified epoxy resin building structural adhesive and has good working performance, the diluent is ethyl acetate, the surfactant is alkynol surfactant, the dispersant is solvent-free wetting dispersant, and the component is high molecular weight ammonium salt copolymer.
3. The method for preparing the thin-layer blockage-dredging water permeable product according to claim 1, wherein the cement in the base layer mixing ratio is 42.5 or 52.5 ordinary portland cement, the water is tap water, the aggregate is limestone macadam, basalt macadam, cobblestone macadam or ceramsite with the thickness of 2-5mm, 5-10mm and 10-20mm, the water reducing agent is a naphthalene water reducing agent or a polycarboxylic acid water reducing agent, the water repellent agent is a lotus leaf water repellent agent and is a non-ionic microemulsion, the water reducing agent is prepared by compounding various waxes and emulsifiers, the cellulose ether is hydroxypropyl cellulose ether, and the reinforcing agent is a SiO-containing water repellent agent2The polymer synthesized with the special functional monomer, the particle size range of the metakaolin is 400-400 mu m, and the specific surface area of the silica fume is 300-400kg/m2The average particle size was 14 μm.
4. The preparation method of the thin-layer blockage-removing water permeable product is characterized in that the surface layer is formed by directly mixing fine sand and a polymer, the pore structure is more compact, the thin-layer surface layer is adopted, the thickness is 1-5mm, a similar thin-layer surface net is formed, the pore diameter is 0.005-0.3mm, and the thin-layer blockage-removing water permeable product can prevent granular substances with the particle size larger than 0.3mm from passing through, so that the blockage-preventing effect is achieved.
5. The anti-blocking performance is as follows: natural outdoor silt is adopted, particles with the particle size of 1.18mm or less are sieved and reserved, water is added to prepare 250mg/L of average total suspended sediment concentration, after the particles penetrate through a permeable product, floating sand on the surface layer of the permeable product is scraped, the surface layer of the permeable product is cleaned and cleaned by a water gun, a test piece is placed into an oven to be dried, the circulation is sequentially carried out for 5 times, the reduction rate of the tested permeability coefficient is 1-20%, and the retention amount of blockages inside the test piece is 1-5%.
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Cited By (4)
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| CN111908829A (en) * | 2020-08-11 | 2020-11-10 | 龚俊琼 | Water repellent agent and pervious concrete for building |
| CN114538818A (en) * | 2022-03-28 | 2022-05-27 | 厦门防水博士新材料有限公司 | Preparation method of concrete reinforcing agent and product |
| CN114687265A (en) * | 2022-04-18 | 2022-07-01 | 石家庄铁路职业技术学院 | Construction waste recycled aggregate pervious concrete and preparation method thereof |
| CN115196920A (en) * | 2022-07-12 | 2022-10-18 | 湖北省成美建材股份有限公司 | Preparation method of concrete with high compression-resistant structure |
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| CN111908829A (en) * | 2020-08-11 | 2020-11-10 | 龚俊琼 | Water repellent agent and pervious concrete for building |
| CN114538818A (en) * | 2022-03-28 | 2022-05-27 | 厦门防水博士新材料有限公司 | Preparation method of concrete reinforcing agent and product |
| CN114538818B (en) * | 2022-03-28 | 2023-04-14 | 厦门防水博士新材料有限公司 | Preparation method of concrete reinforcing agent and product |
| CN114687265A (en) * | 2022-04-18 | 2022-07-01 | 石家庄铁路职业技术学院 | Construction waste recycled aggregate pervious concrete and preparation method thereof |
| CN115196920A (en) * | 2022-07-12 | 2022-10-18 | 湖北省成美建材股份有限公司 | Preparation method of concrete with high compression-resistant structure |
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