Pozzolanic reaction kinetics of coal ashes |
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| Authors: | Hongwei Zheng Zhijuan Wang Jueshi Qian Yuanming Song Zhi Wang |
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| Affiliation: | (1) College of Material Science and Engineering, Chongqing University, Chongqing, 400045, China;(2) College of Environmental and Material Engineering, Yantai University, Yantai, 264005, China |
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| Abstract: | The pozzolanic reactivity was determined by the hydration kinetics of pozzolanic reaction based on the fact that the hydration products of active SiO2 and Al2O3 with lime were soluble in dilute hydrochloric acid. The results show that the pozzolanic reaction of active SiO2 and Al2O3 of coal ashes follows apparent first-order kinetics. The reaction rate constant of FBC ashes is greater than that of PC ashes, while the activation energy of the former is lower than that of the latter. It is confirmed that the pozzolanic activity of fluidized bed combustion(FBC) ashes is significantly higher than that of PC ashes, and the reaction barrier of the former is lower than that of the latter, because the microstructures of FBC ashes, such as mineralogical composition, morphology and polymerization degree of [SiO4] and [AlO6] are more favorable to the pozzolanic activity development than those of PC ashes. Funded by the National Natural Science Foundation of China (No. 50802080) and Shandong Provincial Scientific Research Foundation for Excellent Young Scientists (No.2008BS09005) |
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| Keywords: | coal ashes hydration pozzolanic reactivity kinetics |
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