Application of a high water-reducing and mud-resistant water-reducing agent in high-mud-content concrete

Abstract

The invention discloses an application of a clay-resistant water reducing agent with high water reducing rate in concrete with high clay content, further provides the concrete having high clay contentand containing the water reducing agent, and discloses the clay-resistant water reducing agent with high water reducing rate and a preparation method of the clay-resistant water reducing agent. The clay-resistant water reducing agent with the high water reducing rate is prepared from active monomers containing phosphorous acid functional groups and sulfonic acid functional groups by polymerization on the basis of the principle of high molecular structure design. The molecular structure is in the form of clusters and contains a large number of positively charged amine groups, so that the product is endowed with superior properties of high water reducing, high slump retaining and high tolerance to clay. The water reducing agent is used alone or compounded with other functional polycarboxylate superplasticizers for use, and has good water reducing and slump retaining properties for building solid waste recycled aggregate concrete.

Description

technical field [0001] The invention relates to the application of a water reducing agent in high mud content concrete, in particular to the application of a high water reducing and mud resistant type water reducing agent in high mud content concrete. Background technique [0002] With the unprecedented rapid development of my country's construction industry for more than 30 years, the natural resource consumption of concrete materials is huge, and the high-quality river sand is almost exhausted. Man-made machine-made sand has replaced artificial sand and has become an important raw material for concrete production. Due to the non-standard production process of machine-made sand, such as unwashed powder and mud, etc., there are problems of poor particle gradation and excessive mud and powder content. When the main component of mud powder is stone powder, the workability of concrete Favorable, but when the main component of mud powder is clay, it will absorb a large amount of...

AI Technical Summary

Problems solved by technology

Due to the non-standard production process of machine-made sand, such as unwashed powder and mud, etc., there are problems of poor particle gradation and excessive mud and powder content. When the main component of mud powder is stone powder, the workability of concrete Favorable, but when the main component of mud powder is clay, it will absorb a large amount of water reducer. Clay is a layered substance with adjustable layer spacing, which can absorb a large amount of polycarboxylate water reducer. Studies have shown that clay The layered structure will cause the chain intercalation reaction of the PEO side chain of the polycarboxylate superplasticizer, thereby reducing the dispersion of the polycarboxylate and causing a large loss of concrete slump over time

[0003] Artificial machine-made sand is characterized by high mud content. Concrete prepared by using machine-made sand requires a large amount of water, high admixture content, and large loss of concrete slump over time, which makes it difficult to pump and construct long-distance transported concrete. The key technology to solve this technical problem is to develop a high water-reducing agent with good tolerance to clay

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