硅酸盐学报2017，Vol.45Issue(8)：1153-1158,6.DOI:10.14062/j.issn.0454-5648.2017.08.14
细度和煅烧温度对煤矸石火山灰活性及微观结构的影响
Effects of Calcination Temperature and Particle Size on Pozzolanic Activity and Microstructure of Coal Gangue
摘要
Abstract
The effects of calcination temperature and fineness on the pozzolanic activity of calcined coal gangue were investigated via chemical calcium absorption amount tests and mechanical strength measurement of cement mortar.The mineral composition,chemical structure and topography of coal gangue were analyzed by using X-ray diffraction,scanning electron microscopy,Fourier transform infrared spectrometry and thermogravimetry analysis-differential scanning calorimetry,respectively.The results show that the fineness and calcination temperature both affect the pozzolanic activity of calcined coal gangue,and the pozzolanic activity increases with the decrease of fineness.The optimal calcination temperature is 800 ℃.The dehydroxylation of kaolinite begins when coal gangue is calcined at 500 ℃,which gradually destroys the lamellar structure of kaolinite.Kaolinite completely transforms into porous and disorderly,amorphous structural metakaolinite when calcination temperature is from 600 ℃ to 800 ℃.When calcined at 1 000 ℃,metakaolinite transforms into crystalline mullite and cristobalite,decreasing the disorder degree and pozzolanic activity of calcined coal gangue.关键词
煤矸石/煅烧活化/偏高岭石/火山灰活性/微观结构Key words
coal gangue/calcined activation/metakaolinite/pozzolanic activity/microstructure分类
土木建筑引用本文复制引用
曹永丹,李彦鑫,张金山,曹钊,孙春宝..细度和煅烧温度对煤矸石火山灰活性及微观结构的影响[J].硅酸盐学报,2017,45(8):1153-1158,6.基金项目
内蒙古自然科学基金(2017MS(LH)0521) （2017MS(LH）
内蒙古高等学校科研项目(NJZY17174) （NJZY17174）
国家自然科学基金(51464037)资助. （51464037）
