A slow-release grouting reinforcement material for weak and broken surrounding rock and its application method

By using slow-release grouting reinforcement materials, utilizing the combination of powdered polycarboxylic acid water-reducing agent and fly ash, combined with slow-release activator and magnesium oxide expansion agent, the problems of slow coagulation and hardening and poor durability of traditional cement-based grouting materials are solved, and rapid reinforcement and long-term stability of weak and broken surrounding rock are achieved.

CN117285298BActive Publication Date: 2025-09-26SOUTHEAST UNIV +1
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Patent Information

Application Number
CN202311094521.3
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-08-29
Publication Date
2025-09-26
Estimated Expiration
2043-08-29

AI Technical Summary

Technical Problem

Traditional cement-based grouting materials have problems such as large volume shrinkage, slow setting and hardening, and low early strength. It is difficult to maintain coordinated setting and hardening with fluidity in the sulphoaluminate cement system, and the preparation cost is high, which limits its large-scale application.

Method used

The slow-release grouting reinforcement material is used to maintain long-term fluidity through the synergistic effect of powdered polycarboxylic acid water-reducing agent and fly ash. The slow-release activator is used to quickly release inorganic salt ions during the cement hydration process, promoting the rapid coagulation and hardening of the cement. At the same time, the magnesium oxide expansion agent optimizes the microstructure of the cement stone, increasing its density and durability.

Benefits of technology

The grouting material achieves rapid coagulation and hardening, high early strength, good durability, long fluidity retention time, high cost performance, and is suitable for the reinforcement of weak and broken surrounding rocks to meet construction needs.

✦ Generated by Eureka AI based on patent content.

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Abstract

The present invention discloses a slow-release grouting reinforcement material for weak and broken surrounding rock. The powder material includes ordinary Portland cement, fly ash, magnesium oxide expansion agent, powdered polycarboxylate water-reducing agent, thickener, and slow-release stimulant. The components are arranged in parts by mass as follows: 300-400 parts of ordinary Portland cement, 50-80 parts of magnesium oxide expansion agent, 0.2-0.5 parts of powdered polycarboxylate water-reducing agent, 0.1-0.3 parts of thickener, 3-5 parts of slow-release stimulant, and the remainder is fly ash. The slow-release grouting reinforcement material for weak and broken surrounding rock provided by the present invention has high fluidity, long retention time, fast setting and hardening speed, high early strength, slight volume expansion, good durability, low temperature sensitivity, and high cost performance.
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Citation Information

Patent Citations

  • Sulphoaluminate cement base synchronous slip casting material and preparation method

    CN101693615A

  • A Grouting Reinforcement Method for Soft Rock Tunnels

    CN109578021B

  • Superfine portland cement-based injecting paste material and preparation method thereof

    CN105272069A

  • High-performance sleeve grouting material for prefabricated buildings and preparation method thereof

    CN112408909A