Study on activity evaluation of activated coal-gangue and the hydration process  

作　　者：张洪涛 邓宏卫 冯奇 王培铭 

机构地区：[1]HIT University Science Park Co.,Ltd. [2]School of Materials Science and Engineering,Harbin Institute of Technology [3]School of Municipal and Environmental Engineering,Harbin Institute of Technology [4]School of Science and Engineering of Materials,Tongji University

出　　处：《Journal of Harbin Institute of Technology(New Series)》2007年第6期855-860,共6页哈尔滨工业大学学报（英文版）

基　　金：the National Basic Reasearch Program of China(Grant No.2001CB610704).

摘　　要：Chemical compositions, mineral compositions and the activated mechanism of the coal-gangue were analyzed. And pozzolana activities of the coal-gangue were evaluated after activated. Moreover, hydration heat and hydration compositions of activated coal-gangue-calcium oxide system, as well as hydration degree and hardened paste microstructures of activated coal-gangue-cement system were studied. Results show that pozzolana activities of the activated coal-gangue root in amorphous SiO2 and activated Al2O3. With the exciting of gypsum, the reaction of activated coal-gangue and Ca（OH） 2 would produce hydration products as ettringite, calcium silicate hydrate, and calcium aluminate. The relationship between the curing age and the content of Ca （OH）2 in coal-gangue-cement system was ascertained. Unhydrated particles in the coalogangue-cement paste were more than that in the neat cement paste at the same hydration periods, and even existed at the later stage of hydration. Furthermore, the activated coal-gangue could inhibit growth and gathering of the calcium oxide crystal, and improve the structure of hardened cement paste.Chemical compositions,mineral compositions and the activated mechanism of the coal-gangue were analyzed. And pozzolana activities of the coal-gangue were evaluated after activated. Moreover,hydration heat and hydration compositions of activated coal-gangue-calcium oxide system,as well as hydration degree and hardened paste microstructures of activated coal-gangue-cement system were studied. Results show that pozzolana activities of the activated coal-gangue root in amorphous SiO2 and activated Al2O3. With the exciting of gypsum,the reaction of activated coal-gangue and Ca(OH)2 would produce hydration products as ettringite,calcium silicate hydrate,and calcium aluminate. The relationship between the curing age and the content of Ca(OH)2 in coal-gangue-cement system was ascertained. Unhydrated particles in the coal-gangue-cement paste were more than that in the neat cement paste at the same hydration periods,and even existed at the later stage of hydration. Furthermore,the activated coal-gangue could inhibit growth and gathering of the calcium oxide crystal,and improve the structure of hardened cement paste.

关 键 词：activated coal-gangue CEMENT pozzolana activity HYDRATION function mechanism 

分 类 号：TB321[一般工业技术—材料科学与工程]