The Pozzolanic Activity of the Coal Gauge and its Evaluation

The pozzolanic activity of the coal gauge obtained by thermal treatment is evaluated. X-ray diffraction and the compressive strength of the geopolymer prepared by the heated coal gauge are seen as the pozzolanic activity evaluation basis. The active alumina, degrees of dehydroxylation and the specific gravity of coal gauge at different temperature are measured. The results show that the pozzolanic activity of the coal gauge heated at 600°C for 4h is highest in the pozzolanic activity temperature range of 550-850°C and bad at lower 500°Cand higher 900°C. The degree of dehydroxylation, the active alumina and the specific gravity have great influence on the pozzolanic activity of calcined coal gauge. In the temperature range of the pozzolanic activity, the higher is the degree of dehydroxylation and the active alumina, the greater the pozzolanic activity is. The minimum is the specific gravity, the greater the pozzolanic activity is. So, the pozzolanic activity of the coal gauge can be evaluated approximatively by them.