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Plastic expanding agent for settlement resistance of high flow state cement based cementing material and preparation method thereof

A technology of plastic expansion agent and cementitious material, applied in the field of plastic expansion agent and its preparation, high fluidity concrete/mortar, can solve the problems of unfavorable development of concrete strength and durability, fast reaction speed, large gas generation, etc. Improve the ability of slurry to resist segregation and bleeding, improve viscosity, and improve the effect of homogeneity

Active Publication Date: 2015-06-24
武汉品泰新型建材有限公司
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  • Summary
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  • Description
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AI Technical Summary

Problems solved by technology

[0006] Within 1-3 hours of the plastic stage of cement-based cementitious materials, common expansion agents on the market are used. Even the composite high-expansion calcium aluminate-calcium sulfoaluminate-calcium oxide expansion agent cannot make up for the chemical Shrinkage, self-shrinkage and other shrinkage problems; and the traditional metal powder expansion agent has a fast reaction speed, a large gas volume, large pores, and uneven gas generation, causing tiny cracks to form inside, which is not conducive to the development of concrete strength and durability.

Method used

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specific Embodiment approach

[0030] First of all, the specific embodiment of the present invention is generally described: a plastic expansion agent for anti-settling of a high fluidity cement-based cementitious material, which is made of the following raw materials in weight percentage: azo compound, stabilizer, catalyst, Rheological additive; its formula ratio range is as follows:

[0031] Azo compounds: 30-50 parts;

[0032] Stabilizer: 10-30 parts;

[0033] Catalyst: 5-20 parts;

[0034] Rheology additive: 20-40 parts.

[0035] The azo compound is an aromatic organic macromolecule containing amine groups. Among them, the number of C atoms in organic macromolecules directly affects the anti-sedimentation and compensation shrinkage effects. According to the test results of fluidity and swelling capacity, it is preferred to use azo aromatic compounds with C atoms between 12 and 18 as the main raw materials, specifically p-aminoazobenzene, p-nitrobenzenediazoaminoazobenzene, 4-(diethylamino)azobenzene,...

Embodiment 1

[0043] p-aminoazobenzene: 15 parts;

[0044] p-Nitrobenzenediazoaminoazobenzene: 20 parts;

[0045] Glyceryl stearate: 25 parts;

[0046] Potassium carbonate: 5 parts;

[0047] Sodium silicate: 7 parts;

[0048] Organic bentonite: 28 parts.

[0049] The plastic expansion agent for anti-settling of high-flow cement-based cementitious materials prepared according to the above ratio is mixed into C40 concrete at 0.2‰ of the cementitious materials in ordinary concrete. The early plastic shrinkage rate of the concrete is 0%, the 28-day free expansion rate reaches 0.12%, and the 28-day compressive strength is increased by 3% compared with the benchmark concrete.

Embodiment 2

[0051] 4,4'-Azophenetyl oxide: 20 parts;

[0052] p-aminoazobenzene: 20 parts;

[0053] Tripolyglycerol monostearate: 20 parts;

[0054] Polyethylene glycol stearate: 10 parts;

[0055] Potassium hydroxide: 3 parts;

[0056] Sodium bicarbonate: 5 parts;

[0057] Organic bentonite: 17 parts;

[0058] Modified hydrogenated castor oil: 5 parts.

[0059] The plastic expansion agent for anti-settling of high-flow cement-based cementitious materials prepared according to the above ratio is mixed into C30 concrete at 0.2‰ of the cementitious materials in ordinary concrete. The early plastic shrinkage rate of the concrete is 0.05%, the 28-day free expansion rate reaches 0.1%, and the 28-day compressive strength is increased by 2% compared with the benchmark concrete.

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Abstract

The invention provides a plastic expanding agent for settlement resistance of high flow state cement based cementing materials and a preparation method thereof. The raw materials include, by weight, 30-50 portions of an azo compound, 10-30 portions of a stabilizing agent, 5-20 portions of a catalyst and 20-40 portions of a rheological additive. The plastic expanding agent provided by the invention can be compounded with efficient water reducer and other additives, and can assist auxiliary additive to realize the flow properties of cement based cementing material, effectively improve the workability, wrapping performance and durability of the cement based materials, has certain compensating shrinkage effect on early age shrinkage of cement based cementing material, and shows anti-settlement and anti-segregation effects while maintaining the high flow state of cement based cementing material.

Description

technical field [0001] The invention belongs to the technical field of building materials, and specifically relates to a plastic expansion agent that resists the settlement of concrete / mortar and can continuously generate a certain expansion to compensate for the early shrinkage of cement-based cementitious materials before losing the plasticity stage, and a preparation method thereof; mainly applicable High fluidity concrete / mortar in large-scale projects such as railways, highways, prefabricated bridges, and nuclear power plants. Background technique [0002] In recent years, the commercialization and ready-mixed production of concrete in China has achieved rapid development. As far as the current concrete technology and market conditions are concerned, there are still many challenges: for example, concrete needs higher fluidity to meet the construction requirements of complex building structures; excellent stability and pumpability to speed up construction; high Durabili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/12C04B22/10
Inventor 张绪清陈学兵柯凯蒋禹
Owner 武汉品泰新型建材有限公司
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