CN110590223A - Concrete segregation resisting agent and concrete - Google Patents
Concrete segregation resisting agent and concrete Download PDFInfo
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- CN110590223A CN110590223A CN201911014434.6A CN201911014434A CN110590223A CN 110590223 A CN110590223 A CN 110590223A CN 201911014434 A CN201911014434 A CN 201911014434A CN 110590223 A CN110590223 A CN 110590223A
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- concrete
- segregation
- reducing agent
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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
Abstract
The invention discloses a concrete segregation reducing agent and concrete, and belongs to the field of building material additives. The concrete segregation resisting agent comprises the following raw material components: polyacrylamide, 2-acrylamide-2-methylpropanesulfonic acid, sodium carboxymethylcellulose, beta-cyclodextrin, water glass and an air entraining agent; the concrete is characterized in that the segregation resisting agent and the water reducing agent are added into the concrete raw materials; the invention generally uses 0.1-2% of the concrete admixture, can obviously improve the problems of segregation, bleeding, layering and the like of the concrete, in addition, the naphthalene series, the polycarboxylic acid and the aliphatic concrete water reducing agent are adopted, the admixture has good compatibility, the strength of the concrete at each age is not influenced, the segregation resistance and the bleeding resistance can be improved when the admixture is premixed in a commercial mixing station, and the segregation resistance and the bleeding resistance can be directly added into the concrete when the problems of segregation, bleeding and the like of the concrete occur in a construction site, so that the problems of segregation, bleeding and the like of the concrete can be rapidly solved.
Description
Technical Field
The invention relates to the technical field of building material additives, in particular to a concrete segregation resistance agent and concrete.
Background
The concrete water reducing agent has been widely accepted by the material and engineering industries; with the continuous popularization of commercial concrete, the required engineering quantity is gradually increased every year, the demand for ground materials is increased, and the quality of the ground materials is deteriorated in partial areas, so that the requirement of commercial mixing stations on the adaptability of concrete admixtures is gradually improved; the concrete admixture in the current market mainly takes polycarboxylic acid series, naphthalene series and aliphatic series water reducing agents as main materials; however, in the actual application process of engineering, the problems of segregation, bleeding and the like of commercial concrete when the commercial concrete reaches a construction site are easily caused by sensitive factors of admixture mixing amount caused by temperature, mud content of ground materials and the like, and the construction quality of the concrete is difficult to ensure.
Patent application No. 201310483000.7, 2016-03-16 discloses an anti-segregation agent for concrete, which is prepared by copolymerizing 30-100 parts by weight of A-type monomers and 20-160 parts by weight of B-type monomers, wherein the A-type monomers are any one or a mixture of more than two of acrylamide, N-hydroxymethyl acrylamide, acrylic acid and methacrylic acid according to any proportion; the B-type monomer is any one or a mixture of more than two of hydroxyethyl acrylate, hydroxyethyl methacrylate, hydroxypropyl acrylate, hydroxypropyl methacrylate, prenol polyoxyethylene ether and the like according to any proportion, the concrete segregation resistance agent synthesized by the invention has good compatibility with concrete, does not influence the development of concrete strength, effectively solves the problem of concrete segregation and bleeding on construction sites, improves the segregation resistance of concrete, and is easy to pump.
The patent application number is 201611035965.X, and 2019-05-07 discloses an anti-segregation agent for concrete, which comprises the following components: 5-15 parts of fly ash, 5-15 parts of mineral powder, 1-2 parts of steel fiber, 1-2 parts of polyethylene glycol, 20-30 parts of polycarboxylic acid water reducing agent, 0.8-1.2 parts of tackifier, 0.5-0.9 part of coagulant, 200 parts of deionized water, a plurality of parts of liquid alkali, 5-10 parts of organosilicon monomer, 3-5 parts of oxidant and 1-3 parts of reducing agent, the invention adds fly ash, mineral powder and steel fiber into the segregation resistance agent, not only can improve the compression strength of concrete, but also can effectively improve the working performance and the layering degree of the concrete and improve the segregation resistance of the concrete, PAM is adopted as the tackifier, because PAM has more-NH 2, the tackifier has good hydrophilicity, the concrete has the characteristics of hydrophilcity, water retention, thickening, resistance reduction, tackifying and the like, and the invention has wide raw material sources, low cost, environmental protection and simple operation.
However, the above patent is only applicable to concrete using polycarboxylic acid water reducing agent, and cannot relate to concrete system using naphthalene series and aliphatic series water reducing agent; on the other hand, the segregation-resistant agent related to the patent is added as a component of concrete when being premixed in a commercial mixing station, and the problems of segregation and bleeding of commercial concrete when the commercial concrete reaches a construction site still exist under the influence of factors such as temperature, transport distance, land quality and the like in the actual application process of engineering; therefore, the development of an external-doped powdery segregation resistant agent which has good compatibility and can rapidly solve the problems of concrete segregation, bleeding and the like in a construction site is urgently needed by the commercial concrete engineering industry.
Disclosure of Invention
The invention aims to solve the problems in the prior art and provides a concrete segregation reducing agent and concrete.
In order to achieve the purpose, the invention adopts the following technical scheme:
the concrete segregation resisting agent comprises the following raw material components: polyacrylamide, 2-acrylamide-2-methylpropanesulfonic acid, sodium carboxymethylcellulose, beta-cyclodextrin, water glass and an air entraining agent.
Preferably, the raw materials are mixed according to the following weight portions: 30-40 parts of polyacrylamide, 30-40 parts of 2-acrylamide-2-methylpropanesulfonic acid, 1-3 parts of sodium carboxymethylcellulose, 2-10 parts of beta-cyclodextrin, 2-10 parts of water glass and 1-3 parts of an air entraining agent.
Preferably, the water glass is fine powder of water glass having a modulus of 1.0.
Preferably, the air entraining agent is one or a mixture of more of rosin, sodium dodecyl benzene sulfonate, coconut oil diethanolamide and sodium fatty alcohol sulfate.
The segregation resisting agent and the water reducing agent are added into the concrete raw materials.
Preferably, the water reducing agent is a naphthalene water reducing agent.
Preferably, the water reducing agent is a polycarboxylic acid water reducing agent.
Preferably, the water reducing agent is an aliphatic water reducing agent.
Compared with the prior art, the invention provides a concrete segregation reducing agent and concrete, which have the following beneficial effects:
the concrete segregation-resisting agent takes 2-acrylamide-2-methylpropanesulfonic acid, polyacrylamide and sodium carboxymethylcellulose as anti-dispersing agents, and provides good cohesiveness and water retention for concrete; the beta-cyclodextrin can inhibit and adjust slump loss and keep the fluidity of concrete; the water glass can promote the hydration of the concrete and accelerate the hardening of the concrete; the air entraining agent is used for adjusting the air content of the concrete and improving the workability of the concrete; the invention is a brown yellow powder substance, the general consumption is 0.1-2% of the concrete admixture, can obviously improve the problems of segregation, bleeding, delamination and the like of the concrete, in addition, the naphthalene series, the polycarboxylic acid and the aliphatic concrete water reducing agent are adopted, the admixture has good compatibility, the strength of the concrete at each age is not influenced, the anti-segregation and anti-bleeding performance can be improved when the admixture is added in a commercial mixing station, and the anti-segregation agent can be directly added into the concrete when the concrete has the problems of segregation and bleeding on a construction site, so that the problems of segregation, bleeding and the like of the concrete can be rapidly solved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1:
the concrete segregation reducing agent is prepared with polyacrylamide 30 weight portions, 2-acrylamide-2-methyl propane sulfonic acid 30 weight portions, sodium carboxymethyl cellulose 1 weight portion, beta-cyclodextrin 6 weight portions, water glass 3 weight portions and air entraining agent 1 weight portion and through mixing and stirring.
The concrete is added with the segregation resisting agent with the dosage of 0.5 percent of the concrete water reducing agent, can quickly reduce the bleeding rate of the concrete, and does not influence the compressive strength of the concrete for 7 days and 28 days.
Example 2:
the concrete segregation reducing agent is prepared by mixing and stirring 30 parts of polyacrylamide, 32 parts of 2-acrylamide-2-methylpropanesulfonic acid, 1 part of sodium carboxymethylcellulose, 6 parts of beta-cyclodextrin, 2 parts of water glass and 1 part of air entraining agent.
The concrete is added with the segregation resisting agent with the dosage of 0.2 percent of the concrete water reducing agent, can quickly reduce the bleeding rate of the concrete, and does not influence the compressive strength of the concrete for 7 days and 28 days.
Example 3:
the concrete segregation reducing agent is prepared with polyacrylamide 32 weight portions, 2-acrylamide-2-methyl propane sulfonic acid 32 weight portions, sodium carboxymethyl cellulose 1 weight portion, beta-cyclodextrin 6 weight portions, sodium silicate 2 weight portions and air entraining agent 1 weight portion and through mixing and stirring.
The concrete is added with the segregation resisting agent with the dosage of 0.1 percent of the concrete water reducing agent, can quickly reduce the bleeding rate of the concrete, and does not influence the compressive strength of the concrete for 7 days and 28 days.
In order to verify the effects of the embodiments, C30 common commercial concrete is used as a reference, a bleeding test of the mixture is carried out according to GB/T50080-2016 standard for testing the performance of common concrete mixtures, and the compressive strength is measured according to GB/T50081-2002 standard for testing the mechanical properties of common concrete, wherein the method comprises the following steps of: naphthalene series, comparative example 2: polycarboxylic acids, comparative example 3: the results of comparative tests on the aliphatic water reducing agent under the condition of controlling the same bleeding rate are shown in tables 1, 2 and 3.
TABLE 1C 30 concrete with naphthalene water reducer system
TABLE 2C 30 concrete with polycarboxylic acid water reducer system
TABLE 3C 30 concrete with aliphatic water reducer system
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (9)
1. The concrete segregation resisting agent is characterized by comprising the following raw material components: polyacrylamide, 2-acrylamide-2-methylpropanesulfonic acid, sodium carboxymethylcellulose, beta-cyclodextrin, water glass and an air entraining agent.
2. The concrete segregation reducing agent according to claim 1, wherein the raw materials are as follows in parts by weight: 30-40 parts of polyacrylamide, 30-40 parts of 2-acrylamide-2-methylpropanesulfonic acid, 1-3 parts of sodium carboxymethylcellulose, 2-10 parts of beta-cyclodextrin, 2-10 parts of water glass and 1-3 parts of an air entraining agent.
3. The concrete segregation reducing agent of claim 1 or 2, wherein the air entraining agent is one or more of rosin, sodium dodecyl benzene sulfonate, coconut oil diethanol amide and sodium fatty alcohol sulfate.
4. The concrete segregation reducing agent according to claim 1 or 2, wherein the water glass is a fine powder of water glass having a modulus of 1.0.
5. A concrete, characterized in that the segregation reducing agent and the water reducing agent of claim 1 are added to the concrete raw materials.
6. The concrete according to claim 4, wherein the segregation reducing agent is used in an amount of 0.1-2% of the water reducing agent.
7. The concrete according to claim 4 or 5, wherein the water reducing agent is a naphthalene water reducing agent.
8. The concrete according to claim 4 or 5, wherein the water reducing agent is a polycarboxylic acid water reducing agent.
9. The concrete according to claim 4 or 5, wherein the water reducing agent is an aliphatic water reducing agent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911014434.6A CN110590223A (en) | 2019-10-24 | 2019-10-24 | Concrete segregation resisting agent and concrete |
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| CN201911014434.6A CN110590223A (en) | 2019-10-24 | 2019-10-24 | Concrete segregation resisting agent and concrete |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111410494A (en) * | 2020-04-22 | 2020-07-14 | 成都理工博大工程科技有限公司 | Underwater non-dispersive rapid-hardening grouting leak-stopping composite material and preparation method thereof |
| CN112708025A (en) * | 2020-12-28 | 2021-04-27 | 科之杰新材料集团有限公司 | Anti-segregation intermediate, self-compacting concrete anti-segregation agent and preparation method thereof |
| CN112851182A (en) * | 2021-02-01 | 2021-05-28 | 河北省建筑科学研究院有限公司 | Special anti-adsorbent for iron tailing sand and preparation method thereof |
| CN116023063A (en) * | 2023-02-10 | 2023-04-28 | 德州中科新材料有限公司 | Concrete segregation-resistant agent composition, concrete segregation-resistant agent suitable for mixer truck and preparation method of concrete segregation-resistant agent |
| CN116023063B (en) * | 2023-02-10 | 2024-04-12 | 德州中科新材料有限公司 | Concrete segregation-resistant agent composition, concrete segregation-resistant agent suitable for mixer truck and preparation method of concrete segregation-resistant agent |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111410494A (en) * | 2020-04-22 | 2020-07-14 | 成都理工博大工程科技有限公司 | Underwater non-dispersive rapid-hardening grouting leak-stopping composite material and preparation method thereof |
| CN112708025A (en) * | 2020-12-28 | 2021-04-27 | 科之杰新材料集团有限公司 | Anti-segregation intermediate, self-compacting concrete anti-segregation agent and preparation method thereof |
| CN112708025B (en) * | 2020-12-28 | 2023-08-25 | 科之杰新材料集团有限公司 | Anti-segregation intermediate, self-compacting concrete anti-segregation agent and preparation method thereof |
| CN112851182A (en) * | 2021-02-01 | 2021-05-28 | 河北省建筑科学研究院有限公司 | Special anti-adsorbent for iron tailing sand and preparation method thereof |
| CN116023063A (en) * | 2023-02-10 | 2023-04-28 | 德州中科新材料有限公司 | Concrete segregation-resistant agent composition, concrete segregation-resistant agent suitable for mixer truck and preparation method of concrete segregation-resistant agent |
| CN116023063B (en) * | 2023-02-10 | 2024-04-12 | 德州中科新材料有限公司 | Concrete segregation-resistant agent composition, concrete segregation-resistant agent suitable for mixer truck and preparation method of concrete segregation-resistant agent |
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Application publication date: 20191220 |