A heat-insulating and heat-resistant shotcrete and its preparation method

By using modified silica fume slurry and hydrogel-modified high-strength shale ceramsite, the homogeneity and thermal damage problems of shotcrete in high geothermal environments are solved, improving thermal insulation and heat resistance performance. It is suitable for thermal insulation support structures in high rock temperature tunnels, water inrush tunnels and underground engineering projects.

CN117985977BActive Publication Date: 2026-05-26RAILWAY CONSTR RES INST OF CHINA ACAD OF RAILWAY SCI CO LTD +4
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Patent Information

Application Number
CN202410005085.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-01-03
Publication Date
2026-05-26
Estimated Expiration
2044-01-03

AI Technical Summary

Technical Problem

Existing shotcrete suffers from poor homogeneity, severe rebound, and severe thermal damage in high geothermal environments, resulting in insufficient thermal insulation and heat resistance.

Method used

High-strength shale ceramsite is modified with modified silica slurry and hydrogel. Through the efficient dispersion of modified silica slurry and the surface modification of hydrogel layer, the dispersion performance and affinity of ceramsite in slurry are improved, the water release capacity is increased, pore blockage and thermal damage are prevented, and the workability and heat resistance of concrete are improved.

Benefits of technology

It significantly improves the homogeneity and thermal insulation performance of shotcrete, reduces rebound loss, lowers heat conduction, and enhances the performance and impermeability of concrete throughout its lifespan under high geothermal conditions.

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Abstract

This invention discloses a heat-insulating and heat-resistant shotcrete and its preparation method. This heat-insulating and heat-resistant shotcrete is composed of cement, modified silica mortar, modified heat-insulating ceramsite, fine aggregate, water, admixtures, and accelerators. In this invention, high-strength shale ceramsite with surface modification using hydrogel is introduced as a heat-insulating filler, significantly improving the dispersion and stability of lightweight aggregate in the mortar. It also possesses strong water absorption and slow-release capabilities and surface sealing functions, enabling it to provide pore insulation and internal curing through water storage and release in high-temperature environments. The addition of modified silica mortar, which effectively improves the high-temperature stability and density of the mortar hydration products, comprehensively enhances the homogeneity of the shotcrete mixture, the heat insulation performance of the hardened body, and the strength development and durability under high-temperature conditions. This effectively improves tunnel chamber temperature and extends the service life of the shotcrete under high-temperature conditions. The heat-insulating and heat-resistant shotcrete technology has a clear working mechanism, simple production process, and excellent performance. It is suitable for large-scale production and is of great significance for the high-quality construction of underground projects such as tunnels and mines in high-temperature and high-temperature water inrush environments.
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