Shrinkage-reducing type concrete high-efficiency water reducing agent

Abstract

The invention relates to a shrinkage-reducing type concrete high-efficiency water reducing agent capable of effectively reducing the shrinkage rate of concrete. The agent has the advantages of simpleprocess, convenience in production and reliable performance. With the shrinkage-reducing type concrete high-efficiency water reducing agent of the invention adopted, the shrinkage of the concrete canbe effectively reduced, the defect of the high shrinkage rate of a naphthalene-based superplasticizer is well overcome, the application range of the naphthalene-based superplasticizer is widened. Theshrinkage-reducing type concrete high-efficiency water reducing agent has great social and economic benefits.

Description

technical field [0001] The invention belongs to the field of concrete admixtures, in particular to a shrinkage-reducing high-efficiency water reducer for concrete. Background technique [0002] Naphthalene-based high-efficiency water-reducing agent has become the water-reducing agent with the largest production and usage in my country due to its advantages such as high water-reducing rate, good cement adaptability, low air content, low price, and little influence on setting time. It accounts for more than 55% of the water reducing agent used in my country, and it also has the advantage of being able to be used in combination with various other admixtures, making it the most widely applicable water reducing agent in China. These advantages make naphthalene-based high-efficiency water reducers often used in high-performance concrete and high-strength concrete, and high-performance concrete and high-strength concrete have a large amount of cementitious materials and low water-bi...

AI Technical Summary

Problems solved by technology

[0003] Generally, the solution to this problem is to add an expansive agent to the concrete to generate expansive hydration products to compensate for the shrinkage of the concrete and reduce cracking. Self-expansion can easily lead to concrete cracking, so the use of expansion agent has obvious limitations and uncertainties

The principle of expansion agent is to react with sufficient water to form expansive hydration products. For high-performance concrete and high-strength concrete, which belong to low water-binder ratio concrete, they obviously do not have such conditions. Therefore, expansion agent It is usually difficult to play its due role, and even due to the dense structure inside the concrete, it is difficult for external moisture to enter, thus aggravating the risk of concrete cracking

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