Preparation of New Cementitious System using Fly Ash and Dehydrated Autoclaved Aerated Concrete

查看全文 作　　者：[1]水中和;LU [2]Jianxin;TIAN [2]Sufang;SHEN [2]Peiliang;DING [2]Sha

机构地区：[1]State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology;[2]School of Materials Science and Engineering, Wuhan University of Technology

出　　处：《Journal of Wuhan University of Technology(Materials Science)》索引2014年第29卷第4期,共7页

基　　金：Funded by the'863'National High-tech Research and Development Program of China(No.2012AA06A112) 摘　　要：We experimentally studied the interaction between pozzolanic material(fly ash) and dehydrated autoclaved aerated concrete(DAAC). The DAAC powder was obtained by grinding aerated concrete waste to particles fi ner than 75μm and was then heated to temperatures up to 900 ℃. New cementitious material was prepared by proportioning fly ash and DAAC, named as AF. X-ray diffraction(XRD) was employed to identify the crystalline phases of DAAC before and after rehydration. The hydration process of AF was analyzed by the heat of hydration and non-evaporable water content(Wn). The experimental results show that the highest reactivity of DAAC can be obtained by calcining the powder at 700 ℃ and the dehydrated products are mainly β-C2 S and CaO. The cumulative heat of hydration and Wn was found to be strongly dependent on the replacement level of fl y ash, increasing the replacement level of fl y ash lowered them in AF. The strength contribution rates on pozzolanic effect of fl y ash in AF are always negative, showing a contrary tendency of that of cement-fl y ash system. 关键词：蒸压加气混凝土粉煤灰胶凝体系脱水制备佛罗里达州火山灰效应胶凝材料

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Preparation of New Cementitious System using Fly Ash and Dehydrated Autoclaved Aerated Concrete

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