Ultra-long sustained release polycarboxylic acid slump inhibitor and preparation method thereof

Abstract

The invention discloses an ultra-long sustained release polycarboxylic acid slump inhibitor and a preparation method thereof. The molecular formula of the inhibitor is shown in the description, in theformula, a, b, c, d and n are polymerization degrees and all are positive integers, a=12-18, b=18-45, c=12-27, d=30-54, and n=50-90. The polycarboxylic acid slump inhibitor disclosed by the inventioncan be continuously hydrolyzed for a long time in an alkaline environment of concrete, continuously releases polycarboxylic acid superplasticizer molecules, supplements the consumption of cement hydration on the superplasticizer, achieves sustained maintenance of ultra-long slump, and also has a certain early strength promotion effect on concrete, and the inhibitor is simple in preparation process, easy in condition control and high in operability when being prepared.

Description

technical field [0001] The invention relates to the technical field of concrete. More specifically, the present invention relates to an ultra-long sustained-release polycarboxylate slump retaining agent and a preparation method thereof. Background technique [0002] In recent years, the cement used in concrete has become finer, the water-binder ratio is lower, and the colloidal composition is more complex. The quality of various admixtures such as fly ash, mineral powder, and silica fume is also very different. At the same time, high-quality sand and stone aggregates are increasingly scarce, and low-quality sand and gravel materials such as high-mud sand, washed sand, mountain sand or artificial tailings sand, and their mixed sand are gradually used in various large-scale projects, making It is also more difficult to maintain the fluidity of fresh concrete. Although the emergence of some polycarboxylic acid slump-retaining agents at home and abroad has improved the problem...

AI Technical Summary

Problems solved by technology

At the same time, high-quality sand and stone aggregates are increasingly scarce, and low-quality sand and gravel materials such as high-mud sand, washed sand, mountain sand or artificial tailings sand, and their mixed sand are gradually used in various large-scale projects, making It is also more difficult to maintain the fluidity of fresh concrete

Although the emergence of some polycarboxylic acid slump-retaining agents at home and abroad has improved the problem of poor slump retention of fresh concrete to a certain extent, due to some special requirements for design and construction or limitations in construction technology and environmental conditions, such as: Ultra-long-distance transportation, ultra-long-time pouring, ultra-long-term high temperature, etc., often cause the slump retention time of fresh concrete to be short, and the slump protection effect is poor. In actual construction, problems such as poor wrapping, bleeding, and segregation are prone to occur.

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