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Preparation method and application of high-performance concrete internal curing agent

An internal and curing agent technology for concrete, applied in the field of concrete, can solve the problems of poor water retention effect of the internal curing agent, unfavorable influence of concrete strength, reduction of water absorption rate, etc., and achieves good market application prospects, improves strength, and reduces self-shrinking effects.

Inactive Publication Date: 2019-07-09
北京瑞骞科技有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve this problem, CN201510796346.1 discloses a preparation method of a silane-modified concrete internal curing agent. Compared with the traditional superabsorbent resin, the internal curing agent introduces polyvinyl alcohol, and further introduces a silane coupling agent to Reduce its water absorption rate, have an appropriate amount of water absorption rate in the later stage, have the function of storing water and releasing water, can increase the moisture content inside the concrete, and reduce the early self-shrinkage of the concrete, but the water retention effect of the prepared internal curing agent is not good, which will affect the concrete strength. Unfavorable influence

Method used

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Embodiment 1

[0030] In this embodiment, the technical scheme of the preparation method of the composite concrete internal curing agent is:

[0031] Composite concrete internal curing agent, in parts by weight, includes: 6 parts of nano-silica with a particle size of 40nm, 8 parts of silane coupling agent, 20 parts of kaolin, 35 parts of monomer, and 20 parts of wheat straw;

[0032] The monomers include, in parts by weight: 20 parts of acrylic acid, 8 parts of acrylamide, and 12 parts of allyl polyoxyethylene ether.

[0033] The preparation method of composite concrete internal curing agent is as follows:

[0034] S1. Pretreat the wheat straw with inorganic acid and then add it to the two-phase saline solution of polyethylene glycol for extraction to remove lignin and obtain a uniform cellulose solution, then add acrylic acid and sodium hydroxide aqueous solution to mix in proportion Neutralize and disperse evenly;

[0035] S2. Add acrylamide and allyl polyoxyethylene ether to S1 and stir ...

Embodiment 2

[0038] In this embodiment, the technical scheme of the preparation method of the composite concrete internal curing agent is:

[0039] Composite concrete internal curing agent, in parts by weight, includes: 8 parts of nano-silica with a particle size of 40nm, 8 parts of silane coupling agent, 25 parts of kaolin, 35 parts of monomer, and 20 parts of wheat straw;

[0040] The monomers include, in parts by weight: 20 parts of acrylic acid, 8 parts of acrylamide, and 12 parts of allyl polyoxyethylene ether.

[0041] The preparation method of the composite concrete internal curing agent is the same as that of the above-mentioned embodiment 1.

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Abstract

The invention relates to a composite concrete internal curing agent. The internal curing agent is characterized by comprising the following components in parts by weight: 4-8 parts of nano silicon dioxide, 5-10 parts of a silane coupling agent, 15-30 parts of kaolin, 20-50 parts of monomers and 10-25 parts of wheat straw, wherein the monomers comprise the following components in parts by weight: 10-20 parts of acrylic acid, 5-10 parts of acrylamide and 10-25 parts of allyl polyoxyethylene ether. Through the modified internal curing agent, working performance, mechanical performance and cracking resistance of high-performance concrete are all enhanced to a certain extent.

Description

technical field [0001] The invention relates to the technical field of concrete, more specifically, the invention relates to a preparation method and application of a high-performance concrete internal curing agent. Background technique [0002] At present, most of the projects in our country are using external concrete curing methods, which mainly include traditional curing methods and chemical curing methods. The traditional external maintenance methods include direct spraying of water, covering with plastic film and covering with straw bags for watering, etc. These technological methods not only consume a lot of manpower, material and financial resources, but also have unsatisfactory maintenance effects. However, for the side facades and some complex details of some buildings, the construction difficulty of exterior maintenance will increase a lot, and it is difficult to match the development speed requirements of the industrialization of modern buildings. Chemical conse...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42C04B24/26C08F251/02C08F283/06C08F220/06C08F220/56C08F2/44
CPCC04B24/2694C04B40/0039C08F2/44C08F251/02C08F283/065C08F220/06C08F220/56C04B22/06C04B24/42C04B22/00C04B24/383
Inventor 林咸强王威沈增晖李九苏王潇潇李杰张毅郭腾仪黄志轩孙韵华郑英
Owner 北京瑞骞科技有限公司
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