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A kind of preparation method of concrete inner curing agent

An internal and curing agent technology for concrete, applied in the field of concrete admixtures, can solve the problems of high water absorption rate, reduced concrete work performance, fast water absorption rate, etc., so as to delay the rate of absorbing mixing water, reduce the impact, and reduce the early self-shrinkage. Effect

Active Publication Date: 2017-07-25
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem that the water absorption rate of the existing concrete internal curing agent is too high, the water absorption rate is too fast, and the working performance of the concrete is greatly reduced, the invention provides a preparation method of the concrete internal curing agent

Method used

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  • A kind of preparation method of concrete inner curing agent
  • A kind of preparation method of concrete inner curing agent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A preparation method for concrete internal curing agent, comprising the following steps:

[0029] (1) Add 23.67g of acrylamide, 66.67g of methyl methacrylate, 361.36g of ethanol, 0.4517g of N,N'-methylenebisacrylamide and 2.71g of azobisisobutyronitrile into a four-necked flask and stir well , heated to 70°C and reacted for 4 hours, and the resulting gel was routinely treated to obtain a shell material with a hydrophobic structure of 150-200 mesh.

[0030] (2) Mix 687.8g of deionized water, 124.2g of 2-acrylamido-2-methylpropanesulfonic acid, and 16g of sodium hydroxide, add 3.726g of N,N'-methylenebisacrylamide, and then add hydrophobic Soak 4.14g of the shell material of the structure for 30 minutes, filter and put it into a microwave reactor to react, control the microwave power to 400W, the radiation temperature is 30°C, and the reaction time is 5 minutes, and finally get 100-200 mesh concrete internal curing agent after conventional post-treatment .

Embodiment 2

[0032] A preparation method for concrete internal curing agent, comprising the following steps:

[0033] (1) Add 20.3g of acrylamide, 81.43g of ethyl methacrylate, 237.37g of ethanol, 1.02g of N,N'-methylenebisacrylamide and 2.035g of azobisisobutyronitrile into a four-necked flask and stir well , heated to 60°C and reacted for 7 hours, and the resulting gel was routinely treated to obtain a shell material with a hydrophobic structure of 150-200 mesh.

[0034] (2) Mix 356.6g of deionized water, 124.2g of 2-acrylamido-2-methylpropanesulfonic acid, and 16g of sodium hydroxide, add 6.21g of N,N'-methylenebisacrylamide, and then add hydrophobic Soak 9.936g of the shell material of the structure for 60 minutes, filter and put it into a microwave reactor to react, control the microwave power to 500W, the radiation temperature to 30°C, and the reaction time for 1 minute, and finally get 100-200 mesh concrete internal curing agent after conventional post-treatment .

Embodiment 3

[0036] A preparation method for concrete internal curing agent, comprising the following steps:

[0037] (1) Add 23.67g of acrylamide, 57.34g of methyl acrylate, 361.36g of ethanol, 1.3551g of ethylene glycol dimethacrylate and 2.71g of azobisisobutyronitrile into a four-necked flask and stir evenly, and heat to 55 React at 6°C for 8 hours, and the resulting gel can be treated conventionally to obtain a shell material with a hydrophobic structure of 150-200 mesh.

[0038] (2) Mix 480.8g of deionized water, 124.2g of 2-acrylamido-2-methylpropanesulfonic acid, and 16g of sodium hydroxide evenly, add 5g of N,N'-methylenebisacrylamide, and then add the hydrophobic structure Soak 6.21g of the shell material for 30 minutes, filter and put it into a microwave reactor to react, control the microwave power to 450W, the radiation temperature is 30°C, and the reaction time is 2.5 minutes, and finally get 100-200 mesh concrete internal curing agent after conventional post-treatment.

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Abstract

The invention provides a preparation method of a concrete internal curing agent. The preparation method comprises steps as follows: acrylamide, hydrophobic monomers, ethanol, a cross-linking agent and an initiator are uniformly mixed and heated to 50-70 DEG C and react for 4-10 h, gel is generated and subjected to conventional after-processing, and a shell material adopting a hydrophobic structure is obtained; deionized water, 2-acrylamide-2-methyl propane sulfonic acid, sodium hydroxide and a cross-linking agent are sequentially and uniformly mixed, and a nuclear solution is obtained; the shell material adopting the hydrophobic structure is added and soaked for 30-60 min, the shell material is filtered and put in a microwave reactor to react for 1-5 min, and finally, the concrete internal curing agent is obtained after conventional after-processing. According to the method, a preparation process is simple and convenient, a chemical structure is easy to control, the water absorption rate is lower due to the outer hydrophobic structure of the prepared internal curing agent, and influence of the internal curing agent on workability of concrete can be reduced; the early self-constriction and reduction effect on the concrete is improved by means of the inner hydrophilic structure, and the problem of early cracking of the concrete is solved.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a preparation method of a concrete internal curing agent. Background technique [0002] The internal curing of concrete refers to adding water-absorbing materials to the concrete to form a micro-reservoir inside the concrete. When the relative humidity inside the concrete drops, it can slowly release water to the surroundings to supplement its internal water consumption and maintain the internal humidity of the concrete. Drying effect, which can solve the problem of early shrinkage and cracking caused by the low water-cement ratio of high-performance concrete, has very important theoretical and practical significance. [0003] Super absorbent resin (SAP) is a new type of polymer material that can absorb water hundreds or even thousands of times its own weight. When used as an internal curing agent, it can continuously release water during the hydration process of ceme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/16
Inventor 张小磊刘加平李磊王文彬王瑞李全龙王伟李明田倩
Owner JIANGSU SOBUTE NEW MATERIALS