CN114350221A - Concrete surface reinforcing agent - Google Patents
Concrete surface reinforcing agent Download PDFInfo
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- CN114350221A CN114350221A CN202210028231.8A CN202210028231A CN114350221A CN 114350221 A CN114350221 A CN 114350221A CN 202210028231 A CN202210028231 A CN 202210028231A CN 114350221 A CN114350221 A CN 114350221A
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- concrete
- acrylate copolymer
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- concrete surface
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Abstract
The invention discloses a concrete surface reinforcing agent, which relates to the technical field of concrete and comprises acrylate copolymer emulsion and sodium sulfate, wherein the solid content of the acrylate copolymer emulsion is 5-10%, and the mixing amount of the sodium sulfate is 1-6% of the acrylate copolymer emulsion. The coating also comprises a mixture of talcum powder and graphene powder, a film-forming assistant and a defoaming agent; the mixing amount of the mixture of the talcum powder and the graphene powder is 1% -5% of the acrylate copolymer emulsion, the mixing amount of the film-forming additive is 0.2% -0.6% of the acrylate copolymer emulsion, and the mixing amount of the defoaming agent is 0.2% -0.6% of the acrylate copolymer emulsion. The concrete surface reinforcing agent can effectively improve the surface strength of concrete.
Description
Technical Field
The invention relates to the technical field of concrete, in particular to a concrete surface reinforcing agent.
Background
When the concrete is used in hydraulic engineering buildings, the problems of low surface strength of the concrete, concrete cracks and the like are found. The problems that the cement quality in concrete is not over-critical, impurities in admixture are more, the concrete proportioning design is unreasonable, the concrete is not standard in the transportation and pouring processes and the like can all result in the reduction of the surface strength of the concrete, the dusting of the surface of the concrete is caused, the hydration heat inside the concrete is overlarge, the reinforcement ratio of the concrete is low, the concrete curing condition is lack and the like, and the cracks can be caused on the surface of the concrete.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a concrete surface reinforcing agent aiming at the problem of low concrete surface strength in the prior art.
The technical scheme is as follows: the concrete surface reinforcing agent comprises acrylate copolymerization emulsion and sodium sulfate, wherein the solid content of the acrylate copolymerization emulsion is 5-10%, and the mixing amount of the sodium sulfate is 1-6% of the acrylate copolymerization emulsion.
Further, the coating also comprises a mixture of talcum powder and graphene powder, a film-forming assistant and a defoaming agent; the mixing amount of the mixture of the talcum powder and the graphene powder is 1% -5% of the acrylate copolymer emulsion, the mixing amount of the film-forming additive is 0.2% -0.6% of the acrylate copolymer emulsion, and the mixing amount of the defoaming agent is 0.2% -0.6% of the acrylate copolymer emulsion.
Further, in the mixture of the talcum powder and the graphene powder, the content of the graphene powder is 0-45%.
Further, the solid content of the acrylate copolymer emulsion is 8%, the mixing amount of the sodium sulfate is 3% of the acrylate copolymer emulsion, the mixing amount of the talcum powder and graphene powder mixture is 3% of the acrylate copolymer emulsion, and the mass ratio of the graphene powder in the talcum powder and graphene powder mixture is 30%; the mixing amount of the film-forming additive is 0.6 percent of the acrylate copolymer emulsion, and the mixing amount of the defoaming agent is 0.6 percent of the acrylate copolymer emulsion.
Further, the film-forming assistant is dodecyl alcohol ester; the defoaming agent is a polyether modified defoaming agent.
The invention also provides a method for smearing the concrete surface reinforcing agent, which comprises the following steps:
step 1: polishing the surface of a concrete structure test piece to be coated with the concrete surface reinforcing agent by using abrasive paper to be smooth;
step 2: uniformly coating the concrete surface reinforcing agent on the surface of a concrete structure test piece by using a resin brush for two to three times at intervals of 15-30min, wherein the coating thickness is 0.3-0.6 mm; the total coating thickness is controlled to be 0.8-1.2 mm.
Has the advantages that: the concrete surface reinforcing agent can effectively improve the surface strength of concrete, sodium sulfate further reacts with calcium hydroxide generated by cement hydration, and the generated precipitate can fill pores in the concrete, so that the compactness of the concrete is improved; after the talcum powder is wrapped by the acrylate copolymerization emulsion, the shock resistance and the tensile resistance of the polymerization emulsion can be obviously improved, and the concrete surface reinforcing agent has excellent ductility and is attached to the concrete by utilizing the multilayer sheet structure and the hexagonal network molecular structure of the graphene, so that the cracking resistance and the compressive resistance of the concrete are improved.
Detailed Description
The technical solution of the present invention is described in detail below, but the scope of the present invention is not limited to the examples.
The raw materials adopted in the following examples of the invention are:
the parameters of the acrylate copolymer emulsion are as follows: E0503-X aqueous acrylate emulsion produced by Shenzhen Jitian chemical Co., Ltd has a pH value of 5-7, a milky blue liquid with a solid content of 37% and a viscosity of 1200-1600 CPS;
sodium sulfate: chemical reagent of Chinese medicinal group, and its main ingredient is Na2SO4The pH value is 5.0-8.0, and the solid content is more than or equal to 99.0%.
Talc powder: the main component is SiO2And MgO2Wherein SiO is2Its content is 60%, MgO231 percent of the content, 9 percent of the water content, white powder with the fineness of 325 percent and the ignition loss of 6 percent.
Graphene: qingdao rock ocean carbon Material Co., Ltd., fixed carbon content is not less than 99.0%.
Film-forming auxiliary agent: the content of the film-forming additive, namely the dodecyl alcohol ester, in the wet and macro chemical production is more than 99 percent.
Defoaming agent: polyether modified defoaming agent produced by Lantos industry, milk white water-based liquid, density of 1.01 +/-0.02 kg/m3。
The concrete surface enhancement coating method in the following examples is as follows:
step 1: polishing the surface of the concrete member to be coated with the concrete surface reinforcing agent by using abrasive paper to be smooth;
step 2: spraying to wet the surface of the concrete structural member;
and step 3: uniformly coating the concrete surface reinforcing agent on the surface of the concrete member by using a resin brush for three times at intervals of 20min every time, wherein the coating thickness is about 0.4mm every time; the total coating thickness is controlled to be 0.8-1.2 mm.
Testing the rebound value by a rebound tester: specifically, the axis of the resiliometer is perpendicular to the detection surface of the concrete for horizontal flicking, and the 16 rebound values in the detection area are removed by 3 maximum values and 3 minimum values, so that the average rebound value represents the surface strength of the concrete.
Example 1:
diluting the acrylate copolymer emulsion with water respectively to obtain four groups of solid contents of 2%, 5%, 8% and 10%, and smearing the four groups of solid contents on a concrete member;
testing the rebound value by using a rebound instrument, and testing the rebound value of the concrete on days 1, 14, 28, 56 and 68 before and after smearing; the results are shown in table 1:
TABLE 1
Example 2:
diluting the acrylate copolymer emulsion with water to obtain a solution with a solid content of 8%, dividing the solution into four parts, respectively adding sodium sulfate with different mixing amounts, wherein the mixing amounts of the sodium sulfate are 1%, 3%, 5% and 6% of the acrylate copolymer emulsion, uniformly mixing, and coating the mixture on a concrete member.
The rebound value is measured by a rebound instrument, the rebound value of the concrete on the 1 st, 14 th, 28 th, 56 th and 68 th days before and after coating is measured, and the detection result is shown in the table 2:
TABLE 2
Example 3:
1. diluting the acrylate copolymerization emulsion with water to 8% of solid content, adding sodium sulfate, wherein the mixing amount of the sodium sulfate is 3% of the acrylate copolymerization emulsion, and dividing into 12 parts after uniform mixing;
2. preparing 4 mixtures of talcum powder and graphene, wherein the mass contents of the graphene are 0%, 15%, 30% and 45% respectively;
3. and (3) adding the mixture of 4 talcum powders and graphene into the emulsion prepared in the step (1) according to the mixing amount of 1%, 3% and 5% of the acrylate copolymer emulsion, and uniformly mixing to obtain the concrete surface reinforcing agent.
4. And smearing the concrete surface reinforcing agent on the concrete member.
Testing the rebound value by using a rebound instrument, and testing the rebound values of the concrete on days 1, 28, 56 and 68 before and after smearing; the results are shown in table 3:
TABLE 3
Example 4:
1. diluting the acrylate copolymer emulsion with water to obtain a solution with a solid content of 8%, adding sodium sulfate, a mixture of talcum powder and graphene, wherein the mixing amount of the sodium sulfate is 3% of the acrylate copolymer emulsion, the mixing amount of the talcum powder and the graphene is 3% of the acrylate copolymer emulsion, and the contents of the graphene in the talcum powder and the graphene are respectively 30%; after being mixed evenly, the mixture is divided into 4 parts;
2. adding a film-forming assistant and a defoaming agent into 4 parts of the emulsion obtained in the step 1; the mixing amount of the film-forming additive and the defoaming agent in each part of the emulsion is the same and is respectively 0.2 percent, 0.4 percent, 0.6 percent and 0.8 percent of the acrylic ester copolymer emulsion;
4. smearing the concrete surface reinforcing agent on a concrete structure test piece with a polished smooth surface, and when smearing the concrete structure test piece with a resin brush, evenly smearing the concrete structure test piece surface for three times, wherein the interval is 20min each time, and the smearing thickness is about 0.4mm each time; the total coating thickness is controlled to be 0.8-1.2 mm.
Testing the rebound value by using a rebound instrument, and testing the rebound values of the concrete on days 1, 28, 56 and 68 before and after smearing; the results are shown in table 4:
TABLE 4
Example 1 shows that only the acrylic ester copolymerization emulsion is coated, the surface strength of the concrete is not greatly improved, the solid content in the acrylic ester copolymerization emulsion has a certain influence on the surface strength of the concrete, but when the solid content exceeds 5%, the solid content is increased, the influence on the increase of the surface strength of the concrete is small, and the rebound increase value of 68 days when the solid content of the acrylic ester copolymerization emulsion is 8%, is 1.8;
example 2 shows that the surface strength of concrete is increased by increasing the sodium sulfate content in the acrylate copolymer emulsion, but the surface strength is not increased basically when the sodium sulfate content is more than 3%, and the rebound growth value after 68 days is 4.7 when the sodium sulfate content is 3%; the sodium sulfate further reacts with calcium hydroxide generated by cement hydration, and the generated precipitate can fill the pores in the concrete, so that the compactness of the concrete is improved;
example 3 shows that after the talcum powder is wrapped by the acrylate copolymer emulsion, the impact resistance and the tensile resistance of the polymer emulsion can be obviously improved, so that the bending rigidity and the attachment capacity of a formed film are improved, and when the mixing amount of the talcum powder is 3%, the rebound growth value in 68 days is 5.3; the concrete surface reinforcing agent has excellent ductility and is attached to the concrete by utilizing the multilayer sheet structure and the hexagonal reticular molecular structure of the graphene, so that the cracking resistance and the compressive resistance of the concrete are improved, and further the surface strength of the concrete is improved, but the surface strength of the concrete is greatly increased along with the increase of the content of the graphene in the mixture of the talcum powder and the graphene, and the surface strength of the concrete is not greatly increased along with the increase of the graphene when the graphene accounts for 30% of the mixture of the graphene and the talcum powder;
when the solid content of the acrylate copolymer emulsion is 8%, the mixing amount of sodium sulfate is 3%, the mixture of graphene and talcum powder is 5%, and the proportion of graphene in the mixture of graphene and talcum powder is 30%, the rebound growth value in 68 days is 7.3;
example 4 shows that film-forming aids and defoamers also improve the surface strength of concrete, but do not affect the surface strength of concrete to any great extent. The film forming assistant can effectively improve the cohesiveness and the fluidity of the emulsion and improve the film forming speed. The defoaming agent can reduce the surface tension of foam, inhibit or eliminate the generation of foam, and improve the dispersibility and stability of the emulsion.
Examples 2-4 show that the surface strength of concrete can be improved by sodium sulfate, talcum powder, graphene, a film-forming additive and a defoaming agent, and the comparison of examples 2-4 shows that the surface strength of concrete is greatly influenced by the mixture of talcum powder and graphene.
As noted above, while the present invention has been shown and described with reference to certain preferred embodiments, it is not to be construed as limited thereto. Various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (6)
1. The concrete surface reinforcing agent is characterized by comprising acrylate copolymer emulsion and sodium sulfate, wherein the solid content of the acrylate copolymer emulsion is 5-10%, and the mixing amount of the sodium sulfate is 1-6% of the acrylate copolymer emulsion.
2. The concrete surface enhancer as claimed in claim 1, further comprising a mixture of talc and graphene powder, a film-forming aid and a defoaming agent;
the mixing amount of the mixture of the talcum powder and the graphene powder is 1% -5% of the acrylate copolymer emulsion, the mixing amount of the film-forming additive is 0.2% -0.6% of the acrylate copolymer emulsion, and the mixing amount of the defoaming agent is 0.2% -0.6% of the acrylate copolymer emulsion.
3. The concrete surface enhancer as claimed in claim 2, wherein the graphene powder is contained in the mixture of talc powder and graphene powder in an amount of 0 to 45%.
4. The concrete surface reinforcing agent according to claim 2, wherein the solid content of the acrylate copolymer emulsion is 8%, the mixing amount of the sodium sulfate is 3% of the acrylate copolymer emulsion, the mixing amount of the talcum powder and graphene powder is 3% of the acrylate copolymer emulsion, and the mass ratio of the graphene powder in the talcum powder and graphene powder mixture is 30%; the mixing amount of the film-forming additive is 0.6 percent of the acrylate copolymer emulsion, and the mixing amount of the defoaming agent is 0.6 percent of the acrylate copolymer emulsion.
5. The concrete surface enhancer of claim 1, wherein the film forming aid is a dodecanol ester; the defoaming agent is a polyether modified defoaming agent.
6. The method for applying a concrete surface enhancer according to any one of claims 1 to 5, comprising the steps of:
step 1: polishing the surface of the concrete member to be coated with the concrete surface reinforcing agent by using abrasive paper to be smooth;
step 2: spraying to wet the surface of the concrete structural member;
and step 3: uniformly coating the concrete surface reinforcing agent on the surface of the concrete member by a resin brush for two to three times at intervals of 15-30min, wherein the coating thickness is 0.3-0.6 mm; the total coating thickness is controlled to be 0.8-1.2 mm.
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| CN202210028231.8A CN114350221A (en) | 2022-01-11 | 2022-01-11 | Concrete surface reinforcing agent |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114891444A (en) * | 2022-05-06 | 2022-08-12 | 济南大学 | Concrete surface optimizing agent and preparation and use methods thereof |
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| CN109280451A (en) * | 2018-08-15 | 2019-01-29 | 成都新柯力化工科技有限公司 | A kind of waterborne organic silicon coating and preparation method for concrete construction protection |
| US10954162B1 (en) * | 2019-09-24 | 2021-03-23 | Geopolymer Solutions, LLC | Protective coating |
| CN113754468A (en) * | 2021-07-07 | 2021-12-07 | 黑龙江常岭建材科技有限公司 | Concrete surface reinforcing agent |
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- 2022-01-11 CN CN202210028231.8A patent/CN114350221A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103502003A (en) * | 2011-05-04 | 2014-01-08 | 韦斯国际解决方案股份有限公司 | Improved polymeric composition for cement based substructures |
| CN108841276A (en) * | 2018-05-29 | 2018-11-20 | 芜湖市三山龙城新材料有限公司 | Carbonization preventing paint and preparation method thereof for concrete steel building |
| CN109280451A (en) * | 2018-08-15 | 2019-01-29 | 成都新柯力化工科技有限公司 | A kind of waterborne organic silicon coating and preparation method for concrete construction protection |
| US10954162B1 (en) * | 2019-09-24 | 2021-03-23 | Geopolymer Solutions, LLC | Protective coating |
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| CN114891444A (en) * | 2022-05-06 | 2022-08-12 | 济南大学 | Concrete surface optimizing agent and preparation and use methods thereof |
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