摘要
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 analysis/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.
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 analysis/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.
基金
supported by the Opening Project of State Key Laboratory of Green Building Materials (Grant No.GBM-08-KF105)
the Engineering Research Center of Railway Environmental Vibration and Noise, Ministry of Education (Grant No.01306020)