关键词: 喷射混凝土, 硅灰, 回弹率, 粉尘浓度, 矿井巷道

Abstract: Spray concrete for mine laneway was optimized with silica fume, while its process was as following: the content of silica fume was determined to 5% of quality of cement, silica fume solution of ratio of water to material 0.50 adopted to wet surface of crushed stone, then wet crushed stone mixed with cement first, then with sand. The site test result indicates that the rate of rebound decreases by one-third around, reduce range of dust concentration is between 20%～48%, compressive strength at 28 days increases 30% around. Through optimization, not only the spring-back and dust decrease, but also compressive strength of concrete improves. It has good guidance for the optimization of spray concrete for mine laneway.

Key words: Spray concrete, Silica fume, Rate of rebound, Dust concentration, Mine laneway