Experimental study on activation of coal gangue and preparation of cementing materials

Abstract The production of coal gangue in China is constantly increasing, and it has become a large amount of solid waste. Open-air storage not only leads to a waste of land resources but also the harmful elements in coal gangue can cause pollution to the environment. This article studies the use of activated coal gangue in the preparation of cementitious materials. The research results show that the optimal activation conditions are an activation temperature of 650°C and an activation time of 120 minutes. When the amount of coal gangue mixed under these activation conditions is 25%, the cementitious material prepared has the maximum flexural and compressive strengths at 3d, 7d, and 28d.