CN111116088A - Special cementing agent for self-curing pervious concrete and application thereof - Google Patents
Special cementing agent for self-curing pervious concrete and application thereof Download PDFInfo
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- CN111116088A CN111116088A CN201911180127.5A CN201911180127A CN111116088A CN 111116088 A CN111116088 A CN 111116088A CN 201911180127 A CN201911180127 A CN 201911180127A CN 111116088 A CN111116088 A CN 111116088A
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- agent
- absorbent resin
- super absorbent
- pervious concrete
- self
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Classifications
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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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- 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
-
- 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
-
- 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
-
- 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 special cementing agent for self-curing pervious concrete and application thereof. The cementing agent comprises the following components in parts by weight: 1-5 parts of an internal curing agent, 2-6 parts of a water reducing agent, 10-30 parts of a reinforcing agent and 60-85 parts of an expanding agent; the internal curing agent is selected from one or more of super absorbent resin (SAP) with the grain diameter of 0.075-0.2mm, 0.2-0.3mm, 0.3-0.4mm and 0.4-0.5 mm; the super absorbent resin is any one of starch super absorbent resin, cellulose super absorbent resin and synthetic polymer super absorbent resin. The components of the pervious concrete adopting the special cementing agent have good synergistic effect, the cementing agent absorbs excessive moisture in the production and transportation stage, the water loss condition is weakened before the concrete is hardened, the slurry hanging property of slurry is increased in the transportation process, water is slowly released after the concrete is hardened, the moisture can be provided for the reaction of the expanding agent, the double effects of internal curing are achieved, the shrinkage of the pervious concrete can be reduced, and the cracks of the concrete can be reduced.
Description
Technical Field
The invention relates to the technical field of pervious concrete in building materials, in particular to a special cementing agent for self-curing pervious concrete and application thereof.
Background
The pervious concrete has good water and air permeability, high-efficiency water storage capacity and good decoration, is a novel material worthy of popularization in the construction of sponge cities, and is widely applied to sidewalks, parking lots, squares and the like at present. The pervious concrete is porous lightweight concrete prepared by mixing aggregate, cementing material and water, does not contain fine aggregate, and is a honeycomb structure formed by coating a thin layer of cement paste on the surface of coarse aggregate and mutually bonding the thin layer of cement paste to form pores which are uniformly distributed.
Pervious concrete has more problems in the prior use. The pervious concrete has a low water-cement ratio (0.25-0.35), is porous after being poured and paved, has easy evaporation of water, causes rapid water loss before hardening, even if a film is coated, condensed water evaporated on the film can also flow into the ground along a pore channel, causes incomplete maintenance, has easy shedding of surface stones after hardening, and is easy to generate drying shrinkage cracking; the later strength is not improved and even the internal water content is not enough to meet the hydration, and the like; the low water-gel ratio and the rapid dehydration lead to the fact that the expanding agent can not be fully hydrated, so that the expanding agent can not play a role in crack resistance; the fluidity of pervious concrete in production is controlled more strictly than that of common concrete, the pervious concrete is isolated when being slightly thinner, and the pervious concrete cannot be discharged when being slightly thicker, so that the setting time is short; the jolts in transport result in a sludging of the slurry.
Chinese invention patent CN105753405A discloses a self-crystallizing multi-pore gel material, a preparation method and application thereof, the invention forms a gel material with automatic expansion and contraction functions by compounding a micro-expansion agent, a crystallization agent and fine elastic colloidal particles, and can improve the dosage of porous fine aggregate, thereby improving the strength of pervious concrete.
The invention Chinese patent CN103524085A discloses a high-permeability pervious concrete cementing agent and a preparation method and application thereof, the invention adopts furfuryl ketone resin, epoxy resin, cement, a curing agent and a toughening agent to prepare the cementing agent, and the cementing agent has good compressive strength and permeability after being used.
The super absorbent material in the internal curing of the common concrete is used as an internal curing material to be doped into the concrete, and the reduction of free water after the concrete is hardened is considered, so that the moisture in the internal curing material is released, the moisture is provided for the continuous hydration reaction of the cementing material, and the shrinkage cracking is avoided.
The internal curing agent is made of super absorbent resin (SAP), is the most main unit for absorbing water, storing water and releasing water in later period, and can absorb and release water repeatedly for many times. The SAP is different from the physical water absorption of a thickening agent, the water absorption is in a chemical adsorption form, the SAP is combined with water which is not released inside the thickening agent in a hydrogen bond form, and the water is fixed on a high molecular chain and is occluded in a network structure of a polymer, so that the energy consumed by the evaporation of the water is large, and in addition, the SAP particle surface is filmed, the drying speed is slowed down, and the water loss caused by the evaporation is slowed down.
Disclosure of Invention
Aiming at the problems of the existing pervious concrete, the invention provides a special adhesive for self-curing pervious concrete, which can solve the problems of early rapid dehydration before the pervious concrete is cured, improvement of aggregate slurry coating property, self-curing by releasing water after the pervious concrete is cured, reduction of shrinkage cracking and prevention of strength shrinkage.
The invention aims to overcome the defects of the existing pervious concrete and provides the following concrete: the cementing agent absorbs and stores redundant water in the production stage, and due to the special structure of the SAP, the rapid loss of moisture is prevented before the concrete is hardened, and the problems of surface stone peeling and strength shrinkage after the concrete is hardened are solved; the aggregate slurry coating performance is better improved under the synergistic effect of the internal curing agent and the reinforcing agent in the transportation process, the problem of slurry sinking is avoided, and the ready-mixed pervious concrete is convenient to popularize and use; the stored water is slowly released after hardening, so that the water can be provided for the reaction of the expanding agent, the double effects of internal curing are achieved, the shrinkage can be reduced, and the cracks can be reduced; the pore structure of the hardened concrete can be designed through SAP with different grain diameters and different grading stones, and after the SAP loses water in the concrete, a circular hole is formed; the holes formed by SAP after dehydration can be designed into holes with different apertures according to the size of the SAP, and the holes with different apertures, particularly micro holes, regular round holes, larger holes and irregular holes are helpful to the strength.
The invention provides a special cementing agent for self-curing pervious concrete, which comprises the following components in parts by weight:
the internal curing agent is selected from one or more of super absorbent resin (SAP) with the grain diameter of 0.075-0.2mm, 0.2-0.3mm, 0.3-0.4mm and 0.4-0.5 mm; the super absorbent resin is selected from any one of starch super absorbent resin, cellulose super absorbent resin and synthetic polymer super absorbent resin; the starch super absorbent resin is selected from any one of grafted starch, carboxymethylated starch, phosphated starch and starch xanthate; the cellulose super absorbent resin is selected from any one of grafted cellulose, carboxymethylated cellulose, hydroxypropylated cellulose and xanthated cellulose; the synthetic polymer super absorbent resin is selected from any one of polyacrylate, polyacrylonitrile hydrolysate, vinyl acetate copolymer and modified polyvinyl alcohol;
the water reducing agent is polycarboxylic acid high-performance water reducing agent powder or naphthalene water reducing agent powder.
The reinforcing agent is any one or more of silica fume, latex powder and superfine limestone powder.
The expanding agent is any one of an ettringite expanding agent, a magnesium oxide expanding agent and a calcium-magnesium composite expanding agent.
The self-curing pervious concrete containing the special cementing agent comprises the following components in parts by weight:
the components of the pervious concrete adopting the special cementing agent have good synergistic effect, the cementing agent absorbs excessive moisture in the production and transportation stage, the water loss condition is weakened before the concrete is hardened, the slurry hanging property of slurry is increased in the transportation process, water is slowly released after the concrete is hardened, the moisture can be provided for the reaction of the expanding agent, the double effects of internal maintenance are achieved, the shrinkage of the pervious concrete can be reduced, and the cracks of the concrete can be reduced; the water in the hardened SAP is completely released, pore channels are formed by the SAP, and the hardened pore structure can be designed by adjusting the dosage and the particle size of the SAP.
Detailed Description
The method for testing the water evaporation loss rate comprises the steps of taking a certain amount of freshly-mixed pervious concrete m1Placing in a drying oven at 25 + -2 deg.C, and weighing the weight loss at 2h as water evaporation capacity m2Total weight of pervious concrete m3Water consumption m42h water evaporation rate of
This test method is applicable to all of the following examples.
The method for testing the mortar hanging performance of the aggregate comprises the following steps: and (3) rapidly evaluating by adopting a sieve component ratio: 2kg of the prepared freshly mixed pervious concrete is put into a sieve with the aperture of 2.36mm, the sieve is placed on a plastic barrel, the plastic barrel is placed on a vibration table to vibrate for 60s, and the ratio of the amount of the slurry at the bottom of the sieve to the amount of the sample of 2kg is the sieving ratio.
The present invention will be described in further detail with reference to specific embodiments, but it should not be construed that the scope of the present invention is limited to the following examples.
Example 1: according to the mass parts of 0.2-0.3mm polyacrylonitrile hydrolysate, polycarboxylic acid high-performance water reducing agent, silica fume + latex powder and ettringite expanding agent, the mass parts are 2: 3: 20: 75; uniformly mixing and stirring to obtain a self-curing pervious concrete cementing agent; when the concrete is prepared according to the concrete proportion in the invention, the mixing amount of the cementing agent is 10 percent of the mass of the cementing material.
Example 2: according to the mass parts of 0.2-0.3mm polyacrylonitrile hydrolysate, polycarboxylic acid high-performance water reducing agent, silica fume + latex powder and ettringite expanding agent, the mass parts are 2: 3: 20: 75; uniformly mixing and stirring to obtain a self-curing pervious concrete cementing agent; when the concrete is prepared according to the concrete proportion in the invention, the mixing amount of the cementing agent is 8 percent of the using amount of the cementing material.
Example 3: according to the mass parts of 0.2-0.3mm modified polyvinyl alcohol, polycarboxylic acid high-performance water reducing agent, silica fume + latex powder and ettringite expanding agent, the mass parts are 2: 3: 20: 75; uniformly mixing and stirring to obtain a self-curing pervious concrete cementing agent; when the concrete is prepared according to the concrete proportion in the invention, the mixing amount of the cementing agent is 12 percent of the using amount of the cementing material.
Example 4: according to the mass parts of 0.075-0.2mm +0.3-0.4mm carboxymethyl cellulose, polycarboxylic acid high-performance water reducing agent, silica fume + latex powder + ultrafine limestone powder and ettringite expanding agent, the mass parts of the components are 1: 4: 20: 75; uniformly mixing and stirring to obtain a self-curing pervious concrete cementing agent; when the concrete is prepared according to the concrete proportion in the invention, the mixing amount of the cementing agent is 8 percent of the using amount of the cementing material.
Example 5: according to the mass parts of 0.075-0.2mm +0.3-0.4mm xanthated cellulose, polycarboxylic acid high-performance water reducing agent, silica fume + latex powder + superfine limestone powder and ettringite expanding agent, the mass parts of the components are 1: 4: 20: 75; uniformly mixing and stirring to obtain a self-curing pervious concrete cementing agent; when the concrete is prepared according to the concrete proportion in the invention, the mixing amount of the cementing agent is 10 percent of the using amount of the cementing material.
Example 6: according to the mass parts of 0.075-0.2mm of phosphated starch, a polycarboxylic acid high-performance water reducing agent, silica fume, ultrafine limestone powder and a magnesium oxide expanding agent, the mass parts are 2: 5: 28: 65; mixing and stirring uniformly to obtain a self-curing pervious concrete cementing agent; when the concrete is prepared according to the concrete proportion in the invention, the mixing amount of the cementing agent is 11 percent of the using amount of the cementing material.
Example 7: according to the mass parts of 0.075-0.2mm of grafted starch, a polycarboxylic acid high-performance water reducing agent, silica fume, superfine limestone powder and a magnesium oxide expanding agent, the mass parts are 2: 5: 28: 65; uniformly mixing and stirring to obtain a self-curing pervious concrete cementing agent; when the concrete is prepared according to the concrete proportion in the invention, the dosage of the cementing agent is 9 percent of the dosage of the cementing material.
Example 8: according to the mass portion ratio of 0.2-0.3mm +0.4-0.5mm vinyl acetate copolymer, polycarboxylic acid high-performance water reducing agent, silica fume and calcium magnesium composite expanding agent to 4: 6: 15: 75; mixing and stirring uniformly to obtain a self-curing pervious concrete cementing agent; when the concrete is prepared according to the concrete proportion in the invention, the mixing amount of the cementing agent is 11 percent of the using amount of the cementing material.
Example 9: according to the mass portion ratio of 0.2-0.3mm +0.4-0.5mm vinyl acetate copolymer, naphthalene water reducing agent, silica fume and calcium magnesium composite expanding agent to 4: 6: 15: 75; mixing and stirring uniformly to obtain the autotrophic pervious concrete cementing agent; when the concrete is prepared according to the concrete proportion in the invention, the mixing amount of the cementing agent is 11 percent of the using amount of the cementing material.
Comparative example 1: according to the mass parts, polycarboxylic acid high-performance water reducing agent, silica fume, latex powder and ettringite expanding agent are 3: 20: 77, uniformly mixing and stirring to obtain the self-curing pervious concrete cementing agent; when the concrete is prepared according to the concrete proportion in the invention, the mixing amount of the cementing agent is 10 percent of the using amount of the cementing material.
Comparative example 2: according to the mass parts, polycarboxylic acid high-performance water reducing agent and ettringite expanding agent are 3: 77, uniformly mixing and stirring to obtain the self-curing pervious concrete cementing agent; when the concrete is prepared according to the concrete proportion in the invention, the mixing amount of the cementing agent is 8 percent of the using amount of the cementing material.
Comparative example 3: when the concrete is prepared according to the concrete proportion in the invention, the cementing agent is not added.
The concrete performances of the pervious concrete special additive are compared with those of a control group according to the requirements of CJJ/T135-2009 technical Specification for pervious cement concrete pavements, and the test results of various performances of the pervious concrete are shown in Table 1. The concrete proportion in the invention is as follows: the mixing proportion of the C25 pervious concrete is C: g: w is 380: 1570: 100.
TABLE 1 test results of various properties of pervious concrete
The above comparative experiments show that: the self-curing pervious concrete after the special cementing agent is used has the advantages that the performance of each aspect of the self-curing pervious concrete is better than that of the conventional pervious concrete, the prepared slurry aggregate has good bonding performance without separation under the condition of using the cementing agent, the water evaporation loss rate can be controlled to be 5.5-15% within 2h, the later strength is normally developed, the construction requirement can be better met after 2h, and the 28d drying shrinkage is reduced by 30% or more.
Claims (6)
1. The special cementing agent for the self-curing pervious concrete is characterized by comprising the following components in parts by weight:
1-5 parts of an internal curing agent,
2-6 parts of a water reducing agent,
10-30 parts of a reinforcing agent,
60-85 parts of an expanding agent;
the internal curing agent is selected from one or more of super absorbent resin (SAP) with the grain diameter of 0.075-0.2mm, 0.2-0.3mm, 0.3-0.4mm and 0.4-0.5 mm; the super absorbent resin is any one of starch super absorbent resin, cellulose super absorbent resin and synthetic polymer super absorbent resin.
2. The special cementing agent for self-curing pervious concrete according to claim 1, characterized in that the water reducing agent is polycarboxylic acid high-performance water reducing agent powder or naphthalene water reducing agent powder.
3. The special cementing agent for self-curing pervious concrete according to claim 2, characterized in that the reinforcing agent is any one or more of silica fume, latex powder and ultrafine limestone powder.
4. The special cementing agent for self-curing pervious concrete according to claim 3, wherein the expanding agent is any one of an ettringite expanding agent, a magnesium oxide expanding agent and a calcium-magnesium composite expanding agent.
5. The self-curing water-permeable concrete special cementing agent according to claim 4, wherein the starch-based super absorbent resin is selected from any one of grafted starch, carboxymethylated starch, phosphated starch and starch xanthate; the cellulose super absorbent resin is selected from any one of grafted cellulose, carboxymethylated cellulose, hydroxypropylated cellulose and xanthated cellulose; the synthetic polymer super absorbent resin is selected from any one of polyacrylate, polyacrylonitrile hydrolysate, vinyl acetate copolymer and modified polyvinyl alcohol.
6. The application method of the special cementing agent for the self-curing pervious concrete as claimed in any one of claims 1 to 5, wherein the cementing agent is applied to the self-curing pervious concrete, and the self-curing pervious concrete containing the cementing agent comprises the following components in parts by weight:
300 portions of cement and 400 portions of cement,
1400-1600 portions of aggregate,
30-55 parts of cementing agent,
80-110 parts of water.
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| CN111995318A (en) * | 2020-09-15 | 2020-11-27 | 仁寿县陵州预拌商品混凝土有限公司 | Pervious concrete and preparation method thereof |
| CN112501976A (en) * | 2020-12-17 | 2021-03-16 | 中交三公局第三工程有限公司 | Construction method of high-strength permeable concrete for non-motor vehicle lane |
| CN112723788A (en) * | 2021-01-15 | 2021-04-30 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Efficient water-saving maintenance material |
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