Effects of Surface-activated Coal Gangue Aggregate on Properties of Cement-based Material

摘要

It was introduced that coal gangue (CG) was treated by the surface thermal activation, and effects of the calcined CG on properties, such as flowability and strength of cement-based material were investigated in this paper. Results show that the compressive and flexural strength of cement-based material with the calcined CG aggregates is much higher than that of cement-based material with the natural CG aggregates, but the flowability of cement-based material with calcined CG is significantly reduced with the calcined time. The strength of cement-based material with the calcined CG aggregates only increases little with the calcined time at the same W/C ratio, but is reduced with the calcined time at the same flowability. The CG calcined by the surface thermal activation obviously overcomes the disadvantages of fully calcined CG.