Abstract：Four groups of waste glass powders with different particle sizes were prepared with different milling time. Particle size distribution of the waste glass powders was measured by a laser particle size analyzer. The effect of particle size distribution on activity coefficients of waste glass powders was analyzed by grey connection analysis. The results show that the waste glass powders have volcanic ash activity only when the particle size is smaller than a certain value. The particle size plays a key role in the activity coefficients of waste glass powders with size in range with size in from 6.414 μm to less than 20.710 μm.

Keywords: waste glass powder; particle size distribution; activity coefficient; grey connection