A crack-resistant inorganic polymeric silica-alumina polymer admixture, its preparation method and application

By using crack-resistant inorganic polymer silica-alumina polymer admixtures in cement concrete, high-strength micro-expansion needle-shaped ettringite and CSH gel are generated, solving the problem of easy cracking in cement concrete and improving the crack resistance and structural strength of concrete.

CN119797796BActive Publication Date: 2026-03-13UNIV OF JINAN
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-01-13
Publication Date
2026-03-13

AI Technical Summary

Technical Problem

In existing technologies, cement concrete is prone to cracking due to chemical shrinkage and drying shrinkage. Fiber materials are prone to aging, and improper use of expansion agents can lead to the deterioration of concrete performance, making it difficult to effectively improve crack resistance and structural strength.

Method used

Crack-resistant inorganic high-molecular-weight silica-alumina polymer admixtures are used to generate high-strength micro-expanded needle-shaped ettringite and CSH gel through hydration reaction, forming a continuous structural network, which improves the tensile strength of concrete and reduces shrinkage stress.

Benefits of technology

It effectively improves the crack resistance and overall strength of concrete, enhances structural stability and durability, reduces the risk of cracking, and does not affect workability.

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Abstract

This invention relates to the field of concrete admixture technology, specifically disclosing a crack-resistant inorganic polymer silica-alumina polymer admixture and its preparation method and application. The method includes the following steps: (1) adding an alkalizing agent and a stabilizer to an aluminum sulfate solution and continuously stirring under heating and heat preservation conditions to obtain a precursor liquid. (2) adding diethanol monoisopropanolamine to the precursor liquid and continuously stirring under heating and heat preservation conditions, then allowing the obtained reaction liquid to stand and allow it to precipitate naturally, and taking the supernatant after completion. (3) heating the supernatant and adding fluorosilicic acid under stirring conditions, then keeping it warm, and obtaining the admixture after completion. The inorganic polymer silica-alumina polymer admixture obtained by this invention can react with the large amount of Ca produced by the hydration reaction in the early stage of concrete hardening. 2+ It undergoes an in-situ reaction to form high-strength cementitious products, which improves the tensile strength of concrete and thus enhances the crack resistance of concrete itself.
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Citation Information

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