low temperature nitrogen adsorption, carbonate mineral, FHH model, fractal dimension, acidification,

Abstract

The fire in mine goaf directly threatens the safe and efficient production of mining. Filling the air leakage channel in goaf is the most effective way to prevent spontaneous combustion of coal in goaf. In this paper, the effects of accelerators and foaming agents on the strength of inorganic foaming paste filling materials were discussed, and the mechanism of the reinforcing agents was analyzed. The results show that the inorganic solidified foam material has faster solidification with the increase of the amount of quick-setting admixture; the compressive strength of the filling material with a foaming ratio of 10 is above 1.7 MPa after curing for 7 days; the large number of bubbles existing in the material form numerous uniform defects, and the reinforcing agent causes the aluminum-oxygen component in the paste slurry to react with the cement component on a large scale and quickly to form an excellent hydrated mineral ettringite, so that the overall structure of the material does not change when the material is stressed, and no crack occurs in the middle portion, and the material effectively blocks the cracks in the fire zone and isolate oxygen to prevent fires in the goaf.

Keywords

• paste filling material
• fire extinguishing
• reinforcing agent
• plugging
• compressive strength