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Preparation method of concrete internal 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 workability, high water absorption rate, delaying the rate of absorbing mixing water, solving concrete workability and self-shrinking phase Contradictions, the effect of increasing the moisture content

Active Publication Date: 2016-03-30
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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  • Preparation method of concrete internal curing agent

Examples

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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 128g of deionized water, 36g of acrylic acid, and 16g of sodium hydroxide evenly, control the neutralization temperature <30°C, and add 0.36g of N,N'-methylenebisacrylamide, 0.32g of potassium persulfate and 0.04g of Sodium bisulfite, then add 0.9g of shell material with a hydrophobic structure and soak for 30 minutes, filter and put it in an oven for 3 hours at 60°C to react for 3 hours, and finally obtain a 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 68g of deionized water, 36g of acrylic acid, and 16g of sodium hydroxide evenly, control the neutralization temperature <30°C, and add 1.08g of N,N'-methylenebisacrylamide, 0.032g of potassium persulfate and 0.004g of Sodium bisulfite, then add 2.4g of shell material with a hydrophobic structure and soak for 60 minutes, filter and put it in an oven for 1 hour at 80°C to react for 1 hour, and finally obtain a 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 84g of deionized water, 36g of acrylic acid, and 16g of sodium hydroxide evenly, control the neutralization temperature <30°C, and add 0.5g of N,N'-methylenebisacrylamide, 0.32g of sodium persulfate and 0.035g of Sodium bisulfite, then add 1.36g of shell material with a hydrophobic structure and soak for 45 minutes, filter and put it in an oven for 2 hours at 70°C to react for 2 hours, and finally obtain a 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 the following steps: mixing acrylamide, a hydrophobic monomer, ethanol, a crosslinking agent and an initiating agent uniformly, heating until the temperature is 50-70 DEG C, then carrying out reaction for 4-10 hours, and carrying out conventional after treatment on a generated gel to obtain a shell material with a hydrophobic structure; mixing deionized water, acrylic acid and sodium hydroxide uniformly, controlling the neutralization temperature to be lower than 30 DEG C, then sequentially adding a crosslinking agent and an initiating agent, and mixing uniformly to obtain a core solution; and soaking the shell material with the hydrophobic structure in the core solution for 30-60 minutes, putting the shell material after filtration into a drying oven for reaction for 1-3 hours at 60-80 DEG C, and finally carrying out conventional after treatment to obtain the concrete internal curing agent. According to the preparation method, the preparation process is simple and convenient, the chemical structure is easy to control, an outer layer hydrophobic structure of the prepared internal curing agent enables the water absorbing rate to be relatively slow and can significantly reduce the influence of the water absorbing rate on the workability of concrete, and an inner layer hydrophilic structure can improve the early autogenous shrinkage reduction effect to solve the difficult problem of concrete early cracking.

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 Applications(China)
IPC IPC(8): C04B24/26C08F220/06C08F222/38C08F220/14C08F220/18C04B103/46
CPCC04B24/2641C04B24/2652C04B2103/465C08F220/06C08F220/14C08F220/18C08F222/385C08F220/56
Inventor 刘加平张小磊李磊王文彬李全龙田倩王伟李明
Owner JIANGSU SOBUTE NEW MATERIALS
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