Abstract
Coal mine fire has always been the main disasters in coal mining in various countries around the world, and several attempts have been made to develop many kinds of fire extinguishing materials and technology. Because of the salient features: high foaming factor(that means a small amount of raw materials can produce large-volume of foam concrete), widely source, eco-friendly and economical raw materials, cement-based inorganic foam concrete for engineering filling and coal mine fire extinguishing has become the first choice. But the shortcomings of traditional foamed concrete are obvious, short curing time, poor water retention capacity, foam burst easily, and can not be kept in the spontaneous combustion cavity area for a long time to accumulate and solidify; at the same time after the foam burst, the formation of cracks in the solidified body is sometimes not strict, and so on. So, traditional foamed concrete should be optimized and the aforementioned deficiencies could be overcome. The objective of this paper goes to propose quick-solidifying foamed concrete by laboratory test and to test these materials properties. The stability of the solidified body of the quick-solidifying foamed concrete, foamed concrete slurry fluidity, curability, shrinkage and cracking during solidifying, high temperature resistance and water resistance were tested and the laws and values of these characteristics were got. The results finally show the quick-solidifying foamed concrete developed in the paper with a good performance in implementation of high filling and fire prevention in big space of mine.
Highlights
Coal mine fires have always represented the main disasters in coal mining worldwide (Pomroy and Carigiet, 1995; Jones et al, 2018)
The aim of the present study is to propose a quick-solidifying foamed concrete material, and to investigate whether the material properties are suitable for achieving high filling and fire prevention in the large space of a mine
In view of the current situation regarding coal mine fire control in China, a new type of foamed concrete was prepared for filling large spaces in coal mines, providing quick solidification, light weight, low bleeding, and little to no risk of collapse in the solidified stone
Summary
Coal mine fires have always represented the main disasters in coal mining worldwide (Pomroy and Carigiet, 1995; Jones et al, 2018). Curability, air permeability, high-temperature resistance, and water resistance of the quick-solidifying foamed concrete are studied in detail, to lay the foundation for application of the material in a mine fire area.
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