Rate of pozzolanic reaction of two kinds of activated coal gangue

Two kinds of activated ways are used to prepare activated coal gangue fine powder,one is calcining coal gangue at 800 ℃ (gangue A),and the other is calcining coal gangue with a certain calcite at 800 ℃ (gangue B).The experiment shows that strengths of blended cement mortar with coal gangue B are higher than that of blended cement with coal gangue A.Hydration of cements with the two kinds of activated coal gangue is investigated through a differential thermal analysis.The weight loss due to Ca(OH)2 decomposition of hydration products by differential thermal anaiysis/thermo gravimetric (DTA/TG) can be used to quantify the pozzolanic reaction.A new method based on the composition of hydration cement is proposed to determine the degree of pozzolanic reaction.The results obtained suggest that the degree of pozzolanic reaction of gangue B is faster than that of gangue A.