CN111875316B - Water-absorbent resin plastic concrete and preparation method thereof - Google Patents
Water-absorbent resin plastic concrete and preparation method thereof Download PDFInfo
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- CN111875316B CN111875316B CN202010744601.9A CN202010744601A CN111875316B CN 111875316 B CN111875316 B CN 111875316B CN 202010744601 A CN202010744601 A CN 202010744601A CN 111875316 B CN111875316 B CN 111875316B
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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
- 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
- C04B28/021—Ash cements, e.g. fly ash cements ; Cements based on incineration residues, e.g. alkali-activated slags from waste incineration ; Kiln dust 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
- 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
- C04B28/08—Slag cements
-
- 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
- C04B2111/00293—Materials impermeable 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
- C04B2111/74—Underwater applications
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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 provides a water-absorbent resin plastic concrete and a preparation method thereof, wherein the water-absorbent resin plastic concrete comprises the following mixing ratio parameters: the water-to-glue ratio is 0.5-2.0; unit water consumption 220kg/m 3 ～350kg/m 3 (ii) a The sand rate is 40 to 100 percent; the dosage of the coarse aggregate is 0-1200 kg/m 3 (ii) a The mixing amount of the water reducing agent is 0-2.5% of the mass of the cementing material; the blending amount of the admixture is 0-50% of the mass of the cementing material; the mixing amount of the bentonite and/or the clay is 20 to 80 percent of the mass of the cementing material; the mixing amount of the water-absorbent resin powder with the surface coated with the stearic acid is 0.1 to 2 percent of the mass of the gelled material. According to the invention, the water-absorbent resin powder with the surface coated with stearic acid is added into the plastic concrete, so that the water-absorbent resin is exposed after the plastic concrete is solidified and hardened, and the anti-seepage performance of the plastic concrete is improved.
Description
Technical Field
The invention belongs to the technical field of hydraulic engineering, and particularly relates to water-absorbent resin plastic concrete and a preparation method thereof.
Background
The plastic concrete is a material with mechanical property and degeneration property between those of concrete and common concrete. The elastic modulus of the plastic concrete is similar to that of the foundation, the plastic concrete has higher flexibility, can better adapt to foundation deformation, is jointly stressed with the foundation, and has higher limit deformation than common concrete, so that the plastic concrete has better crack resistance and shock resistance. Meanwhile, the plastic concrete has excellent anti-permeability performance and can effectively reduce the leakage amount of the anti-seepage wall. Moreover, the plastic concrete also has good workability, longer final setting time and lower strength, can be better constructed and is easy to operate. In addition, proper cohesive soil is doped into the plastic concrete, so that the dosage of cement is reduced, the impermeability of the plastic concrete is improved, and the cost is reduced. However, the barrier performance of the plastic concrete still needs to be improved at present.
The water-absorbent resin is a functional polymer material containing a strong hydrophilic group and having a certain degree of crosslinking, has high expansibility and high water absorption, and can rapidly absorb water. When the water-absorbent resin is added into concrete, the water-absorbent resin can absorb a large amount of water in the mixing process and cannot enable the water to escape in the stirring process, but the water in the water-absorbent resin can be evaporated by heat emitted in the cement hydration and condensation process, so that the water of the water-absorbent resin is dehydrated, the volume of the water-absorbent resin is reduced, a corresponding pore channel is formed in the concrete, and the anti-seepage performance of the concrete is reduced. For example, CN110482969A and CN110482969A are added with water-absorbing resin in concrete, and the obtained concrete has no barrier property.
Disclosure of Invention
The first object of the present invention is to provide a water-absorbent resin plastic concrete which can improve the barrier property of the plastic concrete.
The second purpose of the invention is to provide a preparation method of the water-absorbent resin plastic concrete.
Considering that the water-absorbent resin has high water absorption and generates larger volume expansion after absorbing water, for example, the water-absorbent resin can be prevented from absorbing water before the plastic concrete is solidified and hardened, and the water-absorbing swelling property of the water-absorbent resin can be recovered after the plastic concrete is solidified and hardened, so that the pores of the plastic concrete can be blocked, and the anti-seepage performance of the plastic concrete can be obviously improved.
In order to achieve the purpose, the invention adopts the technical scheme that:
a water-absorbent resin plastic concrete comprises raw materials of water, a cementing material, coarse aggregates, sand and a water reducing agent, wherein the raw materials of the cementing material comprise cement, an admixture, bentonite and/or clay, and water-absorbent resin powder with surface coated with stearic acid;
the water-absorbent resin plastic concrete comprises the following mixing ratio parameters: the water-to-glue ratio is 0.5-2.0; unit water consumption 220kg/m 3 ～350kg/m 3 (ii) a The sand rate is 40 to 100 percent;
the dosage of the coarse aggregate is 0-1200 kg/m 3 ；
The mixing amount of the water reducing agent is 0-2.5% of the mass of the cementing material;
the blending amount of the admixture is 0-50% of the mass of the cementing material;
the mixing amount of the bentonite and/or the clay is 20 to 80 percent of the mass of the cementing material;
the mixing amount of the water-absorbent resin powder with the surface coated with the stearic acid is 0.1 to 2 percent of the mass of the gelled material.
Compared with the prior art, the surface of the super absorbent resin is coated with stearic acid, and the stearic acid is utilized to isolate the water absorbent resin from water in the mixture in the process of mixing the plastic concrete, so that the water absorbent resin is prevented from absorbing water and expanding before the plastic concrete is coagulated and hardened. After the plastic concrete is set and hardened, the cement hydration product generates calcium hydroxide, and the calcium hydroxide gradually reacts with stearic acid, so that the water-absorbent resin is exposed. When the hardened plastic concrete is contacted with water, the exposed water-absorbing resin absorbs water and swells, so that capillary pores of the plastic concrete are blocked, internal water seepage channels are cut off, and the anti-seepage effect of the plastic concrete is obviously enhanced.
The mass ratio of stearic acid in the water-absorbent resin powder with the surface coated with stearic acid is 3-8%.
The water-absorbent resin powder coated with stearic acid is prepared by co-grinding a water-absorbent resin and stearic acid.
The particle diameter of the water-absorbent resin powder is not more than 100 meshes.
The water absorption capacity of the water-absorbent resin is 20-100 times of the self-mass.
The water-absorbent resin is at least one selected from the group consisting of a starch-based water-absorbent resin, a cellulose-based water-absorbent resin, a polyacrylic acid-based water-absorbent resin, a polyvinyl alcohol-based water-absorbent resin, and a polyoxyethylene-based water-absorbent resin.
The plasticity index of the clay is not less than 17, and the clay content is not less than 30%.
The particle size of the clay is not more than 0.16 mm.
The bentonite is at least one selected from calcium bentonite and sodium bentonite.
The particle size of the coarse aggregate is 5-40 mm; preferably, the size fraction of the coarse aggregate comprises 5-20 mm, 5-25 mm, 5-31.5 mm, 5-40 mm, 16-31.5 mm and 20-40 mm.
The coarse aggregate is at least one of crushed stone and gravel.
The cement is selected from at least one of portland cement, ordinary portland cement, portland slag cement, portland fly ash cement, pozzolanic portland cement, moderate-heat portland cement, low-heat portland cement and composite portland cement; the cement strength grade is any one of 32.5, 32.5R, 42.5R, 52.5 and 52.5R.
The sand is selected from at least one of river sand, mountain sand, machine-made sand and artificial sand.
The admixture is selected from at least one of fly ash, silica fume, slag powder, phosphorous slag powder and limestone powder.
The water reducing agent is at least one selected from lignosulfonate water reducing agents, naphthalene water reducing agents, melamine water reducing agents, sulfamate water reducing agents, fatty acid water reducing agents and polycarboxylic acid water reducing agents.
The water is one of natural water, tap water and reclaimed water.
A preparation method of water-absorbent resin plastic concrete comprises the following steps: and adding water into the coarse aggregate, the sand, the admixture, the water reducing agent, the bentonite and/or the clay, the water-absorbent resin powder with the surface coated with the stearic acid and the cement, and mixing to obtain the water-absorbent resin.
Compared with the prior art, the invention has the following beneficial effects: according to the invention, the water-absorbent resin powder with the surface coated with stearic acid is added into the plastic concrete, so that the water-absorbent resin is exposed after the plastic concrete is solidified and hardened, and the anti-seepage performance of the plastic concrete is improved.
Detailed Description
The technical solution of the present invention is further described below with reference to specific examples.
The invention provides a water-absorbent resin plastic concrete, and the raw materials and the mixing ratio parameters are shown in table 1.
TABLE 1 Water-absorbent resin Plastic concrete raw materials and mixing ratio parameters
In table 1, the water-cement ratio is the mass ratio of water to cement.
The water used in examples 1 to 6 was reclaimed water.
The cementing material consists of cement, admixture, bentonite, clay and water-absorbent resin powder coated with stearic acid on the surface, wherein the cement is Portland cement with the strength grade of 52.5R; the admixture is fly ash, slag powder or phosphorus slag powder; the bentonite is calcium bentonite; the plasticity index of the clay is 15.7, the content of clay particles is 37.8, and the particle size is not more than 0.16 mm; a water-absorbent resin powder having a stearic acid-coated surface is obtained by co-grinding a water-absorbent resin and a stearic acid, wherein the water-absorbent resin powder has a particle diameter of not more than 100 mesh, the water-absorbent resin is a cellulose-based water-absorbent resin, and the water absorption capacity is 85 times the mass of the water-absorbent resin. Wherein, the mass ratio of stearic acid in the water-absorbent resin powder with the surface coated with stearic acid is respectively as follows: example 1 was 3%, example 2 was 4%, example 3 was 5%, example 4 was 6%, example 5 was 7% and example 6 was 8%.
The sand rate is the proportion of sand in the aggregate, the aggregate comprises coarse aggregate and sand, the coarse aggregate is broken stone, the broken stone has a particle size of 5-20 mm, 5-25 mm, 5-31.5 mm, 5-40 mm, 16-31.5 mm or 20-40 mm, and the sand is river sand.
The water reducing agent is a naphthalene water reducing agent.
The preparation method of the water-absorbent resin plastic concrete of examples 1 to 6 includes the steps of:
(1) the water-absorbent resin and stearic acid were co-ground in a ratio to obtain a water-absorbent resin powder having a surface coated with stearic acid.
(2) And screening the sandstone, and stacking the sandstone according to the particle size for later use.
(3) And (3) dry-mixing the water-absorbent resin powder coated with stearic acid on the surface into the cement, and uniformly mixing.
(4) The clay is air dried and sieved to a particle size of not more than 0.16 mm.
(5) According to the proportion, the coarse aggregate, the sand, the admixture, the water reducing agent, the bentonite and/or the clay, the water-absorbent resin powder with the surface coated with the stearic acid and the cement are added with water and are mixed by a mixer or manually to prepare the plastic concrete.
(6) And (5) maintaining the plastic concrete.
For comparison, comparative examples 1 to 7 are provided below.
Among them, comparative example 1 is different from example 1 only in that: the amount of the water-absorbent resin powder coated with stearic acid was 0.
The only difference between comparative example 2 and example 1 is that: the amount of the water-absorbent resin powder coated with stearic acid was 0.05% of the amount of the binder.
The only difference between comparative example 3 and example 1 is that: the amount of the water-absorbent resin powder coated with stearic acid was 3% of the amount of the gelled material.
Comparative example 4 differs from example 1 only in that: the surface of the water-absorbent resin was not coated with stearic acid, i.e., the water-absorbent resin was incorporated alone into the gelled material.
The only difference between comparative example 5 and example 1 is that: the mass ratio of stearic acid in the water-absorbent resin powder surface-coated with stearic acid was 2%.
Comparative example 6 differs from example 1 only in that: the mass ratio of stearic acid in the water-absorbent resin powder surface-coated with stearic acid was 9%.
The only difference between comparative example 7 and example 1 is that: the water-absorbent resin powder coated with stearic acid has a water-absorbent resin particle diameter of more than 100 meshes, specifically 200 meshes
The water-absorbent resin plastic concrete of examples 1 to 6 and comparative examples 1 to 7 were subjected to the performance test, and the results are shown in Table 2 below.
TABLE 2 test results of water-absorbent resin plastic concrete Properties
According to the test results, the water-absorbent resin plastic concrete has the advantages of good workability, higher compressive strength, low elastic modulus, good flexibility and strong impermeability, and the permeability coefficient of the water-absorbent resin plastic concrete is further reduced and the impermeability is enhanced along with the increase of time.
In contrast, the permeability coefficient of the wet concrete was significantly increased and the permeation resistance was lowered by omitting the water-absorbent resin powder whose surface was coated with stearic acid (comparative example 1), or by adding the water-absorbent resin powder whose surface was coated with stearic acid in an amount that was too low (comparative example 2) or too high (comparative example 3), or by simply using a water-absorbent resin that was not coated with stearic acid (comparative example 4), and by making the amount of coating with stearic acid inappropriate (comparative examples 5 and 6).
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A water-absorbent resin plastic concrete characterized in that: the raw materials of the water-absorbent resin plastic concrete comprise water, a cementing material, coarse aggregates, sand and a water reducing agent, wherein the raw materials of the cementing material comprise cement, an admixture, bentonite and water-absorbent resin powder with stearic acid coated on the surface;
the water-absorbent resin plastic concrete comprises the following mixing ratio parameters:
the water-to-glue ratio is 0.5-2.0;
unit water consumption 220kg/m 3 ～350kg/m 3 ；
The sand rate is 40 to 100 percent;
the dosage of the coarse aggregate is 338-1200 kg/m 3 ；
The mixing amount of the water reducing agent is 0-2.5% of the mass of the cementing material;
the blending amount of the admixture is 20-50% of the mass of the cementing material; the admixture is selected from at least one of fly ash, silica fume, slag powder, phosphorous slag powder and limestone powder;
the mixing amount of the bentonite is 20-80% of the mass of the cementing material;
the mixing amount of the water-absorbent resin powder with the surface coated with stearic acid is 0.1-2% of the mass of the cementing material;
the mass ratio of stearic acid in the water-absorbent resin powder with the surface coated with stearic acid is 3-8%; the particle diameter of the water-absorbent resin is not more than 100 meshes.
2. A water-absorbent resin plastic concrete characterized in that: the raw materials of the water-absorbent resin plastic concrete comprise water, a cementing material, coarse aggregates, sand and a water reducing agent, wherein the raw materials of the cementing material comprise cement, an admixture, clay and water-absorbent resin powder with stearic acid coated on the surface;
the water-absorbent resin plastic concrete comprises the following mixing ratio parameters:
the water-to-glue ratio is 0.5-2.0;
unit water consumption 220kg/m 3 ～350kg/m 3 ；
The sand rate is 40 to 100 percent;
the dosage of the coarse aggregate is 338-1200 kg/m 3 ；
The mixing amount of the water reducing agent is 0-2.5% of the mass of the cementing material;
the blending amount of the admixture is 20-50% of the mass of the cementing material; the admixture is selected from at least one of fly ash, silica fume, slag powder, phosphorous slag powder and limestone powder;
the clay content is 20-80% of the mass of the cementing material;
the mixing amount of the water-absorbent resin powder with the surface coated with stearic acid is 0.1-2% of the mass of the cementing material;
the mass ratio of stearic acid in the water-absorbent resin powder with the surface coated with stearic acid is 3-8%; the particle diameter of the water-absorbent resin is not more than 100 meshes.
3. The water-absorbent resin plastic concrete according to claim 1 or 2, characterized in that: the water-absorbent resin powder coated with stearic acid on the surface is obtained by co-grinding water-absorbent resin and stearic acid.
4. The water-absorbent resin plastic concrete according to claim 1 or 2, characterized in that: the water absorption capacity of the water-absorbent resin is 20-100 times of the self-mass.
5. The water-absorbent resin plastic concrete according to claim 1 or 2, characterized in that: the water-absorbent resin is at least one selected from the group consisting of a starch-based water-absorbent resin, a cellulose-based water-absorbent resin, a polyacrylic acid-based water-absorbent resin, a polyvinyl alcohol-based water-absorbent resin, and a polyoxyethylene-based water-absorbent resin.
6. The water-absorbent resin plastic concrete according to claim 2, characterized in that: the plasticity index of the clay is not less than 17, and the clay content is not less than 30%.
7. The water-absorbent resin plastic concrete according to claim 6, characterized in that: the particle size of the clay is not more than 0.16 mm.
8. The water-absorbent resin plastic concrete according to claim 1, characterized in that: the bentonite is selected from at least one of calcium bentonite and sodium bentonite.
9. A method for producing a water-absorbent resin plastic concrete according to claim 1, characterized in that: the method comprises the following steps: and adding water into the coarse aggregate, the sand, the admixture, the water reducing agent, the bentonite, the water-absorbent resin powder with the surface coated with the stearic acid and the cement, and mixing to obtain the water-based cement.
10. A method for producing a water-absorbent resin plastic concrete according to claim 2, characterized in that: the method comprises the following steps: and adding water into the coarse aggregate, the sand, the admixture, the water reducing agent, the clay, the water-absorbent resin powder with the surface coated with the stearic acid and the cement, and mixing to obtain the water-based cement.
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| CN112979231A (en) * | 2021-02-19 | 2021-06-18 | 中基发展建设工程有限责任公司 | High-impermeability flexible concrete composition and preparation method and application thereof |
| CN114108406A (en) * | 2021-11-26 | 2022-03-01 | 山东大学 | Roadbed humidity control and drainage intelligent device based on modified water-absorbent resin and application method thereof |
| CN115434282B (en) * | 2022-08-31 | 2023-08-15 | 东莞市水利勘测设计院有限公司 | Composite type impervious wall for hydraulic engineering and construction method thereof |
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| JPS61166877A (en) * | 1985-01-17 | 1986-07-28 | Sumitomo Chem Co Ltd | Water-swelling water stopping material |
| JPH0280385A (en) * | 1988-09-14 | 1990-03-20 | Tsuruga Cement Kk | Admixture for cement concrete and mortar using high-water-absorption resin |
| PL2499104T3 (en) * | 2009-11-11 | 2016-12-30 | Dry mortar mixture | |
| CN102617073B (en) * | 2012-01-20 | 2014-06-11 | 北京新奥混凝土集团有限公司 | Plastic concrete for cutoff wall |
| CN105924565B (en) * | 2016-06-06 | 2018-05-15 | 武汉轻工大学 | Modified super absorbent polymer and preparation method thereof and the application in cement-based material |
| CN110627394A (en) * | 2019-10-29 | 2019-12-31 | 重庆中防德邦防水技术有限公司 | Self-healing waterproof filler capable of expanding in water and preparation method thereof |
| CN110818351A (en) * | 2019-11-19 | 2020-02-21 | 中铁大桥局第七工程有限公司 | Plastic concrete for runner cushion layer and preparation method thereof |
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