Study and Application of Foamed Cement Solidified Filling Materials

Abstract

In view of the coal spontaneous combustion accident caused by air leakage in the mine, this paper studied the foaming cement solidified filling material used for mine filling and plugging with cement as the base material, foaming agent, gypsum and polypropylene fiber as additives. Through the single factor test method, the optimized ratio of the main components affecting the compressive strength and expansion ratio of the foamed cement solidified filling material was determined as the water-cement ratio 0.5, the foaming agent content 1%, and the gypsum content 6%, polypropylene fiber 0.4%. Taking Cuimu Mine as the experimental background, through the design of reasonable and effective filling technology scheme, the 21303 wind tunnel in the lower part of 22306 working face of Cuimu Mine was filled. The test results show that the foamed cement solidified material effectively enhances the airtightness of the wind tunnel and the roadway.

Keywords

• foamed cement
• filling materials
• compressive strength
• expansion ratio
• mine filling
• optimizing ratio