A kind of thermal damage isolation material for deep-heat shaft and its preparation method

Abstract

The invention discloses a thermal damage isolation material for deep-heat shafts and a preparation method thereof, and belongs to the fields of heat damage control of mine surrounding rocks and building thermal environment. It includes the following components in parts by weight, modified fly ash 0-300, cement 100-800, medium coarse sand 500-900, water 300-600, organic fiber 10-15, early strength agent 5-15, compound With foaming agent 3-15, additive 5-10. The present invention selects the modified fly ash that has been physically activated and chemically excited, so that more active pozzolans in the fly ash can participate in the hydration reaction, effectively saving the amount of high-grade cement, and improving the workability of the mixture. Reduce heat of hydration and thermal expansion, improve compression resistance and impermeability; the present invention uses organic fibers and additives to enhance flexural strength and deformability, and can effectively inhibit shrinkage and cracking; the thermal conductivity is determined to be 0.08-0.18 W / (m·K), has excellent thermal damage barrier ability; the invention has simple formula, long foam stabilization time and low thermal conductivity, and is suitable for thermal insulation of underground tunnels, external walls and non-load-bearing walls.

Description

technical field [0001] The invention can be used for thermal insulation of surrounding rocks and external walls of deep-heat wells, so as to achieve the purpose of heat damage control, energy saving and emission reduction, and belongs to the technical field of heat damage control of mine surrounding rocks and building thermal environment, in particular to a deep-heat well Lane heat hazard insulation material and preparation method thereof. Background technique [0002] The high-temperature thermal environment hazards in deep-heat mines mainly include: ① seriously infringing on the physical and mental health of miners; ② reducing labor productivity; ③ affecting the safe production of enterprises. With the increase of mine mining depth, heat damage becomes more and more serious, among which the heat transfer of surrounding rock is one of the main causes of roadway heat damage. During roadway excavation and the ventilation system has not yet formed a loop, in addition to mecha...

AI Technical Summary

Problems solved by technology

The existing downhole heat insulation materials mostly use foam glass, foam aluminum, foam ceramics, etc. The price of heat insulation and flame retardant materials is high, the production energy consumption is high, and the life cycle is short

Granular loose insulation materials such as expanded perlite have high water absorption and are loose and difficult to use

Especially when applied to surrounding rocks in deep wells, the above-mentioned materials have low compressive and flexural strength, and are easy to be fractured and broken, forming crack channels, reducing or even failing to achieve heat insulation effect

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