水泥窑灰-粉煤灰体系的水化与强度发展(英文)  

Hydration and Strength Development in a Cement Kiln Dust-Fly Ash System

作　　者：葛智[1] 王科进 Surendra R.SHAH 

机构地区：[1]山东大学土建与水利学院,中国济南250061 [2]Department of Civil and Construction Engineering,Iowa State University,Ames,IA 50011,USA [3]Department of Civil and Environmental Engineering,Northwestern University,Evanston,IL 60208,USA

出　　处：《硅酸盐学报》2012年第1期12-19,共8页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(CMS-0086819)资助项目

摘　　要：研究了配合比与养护温度对水泥窑灰(cement kiln dust,CKD)—粉煤灰(fly ash,FA)净浆的水化与强度发展的影响。净浆采用5种不同的水泥窑灰与粉煤灰比例配制,部分试件添加硅酸盐水泥作添加剂。试件在24、38℃及50℃的条件下进行养护。采用热重分析与X射线衍射测试试件的水化产物。结果表明在50℃的养护条件下,75%CKD+25%FA与45%CKD+45%FA+10%OPC试件的28 d与56 d强度分别达到了100%OPC水泥净浆强度的70%与80%以上。CKD-FA体系中的主要结晶水化产物是钙矾石。无论CKD与FA比例多大,CKD-FA浆体中钙矾石的含量显著高于水泥净浆。CKD-FA体系中钙矾石在90d的龄期仍可保持稳定。In this paper,effects of mix proportion and curing temperature on hydration and strength development of pastes made with cement kiln dust（CKD） and fly ash（FA） was studied.Samples made with five different CKD-to-FA ratios,with and without type I ordinary Portland cement（OPC） as an additive,were cured at 24,38,and 50 ℃.The hydration products of the pastes were examined using thermogravimetric analysis and X-ray diffraction tests.The results indicate that the strength of the pastes made with 75%CKD-25%fly ash and 45%CKD-45%fly ash-10%OPC cured at 50 ℃ reached over 70% and 80% strength of the paste made with 100%OPC at the ages of 28 and 56 d,respectively.The major crystalline hydration product in the CKD-FA pastes was ettringite.Regardless of CKD-to-FA ratio,the amount of ettringite in the CKD-FA paste was considerably higher than that of the paste made with 100% OPC.The ettringite existed in the CKD-FA pastes stably for over 90 d.

关 键 词：水泥窑灰 粉煤灰 热分析 水化 抗压强度 

分 类 号：TQ443.1[化学工程—化学肥料工业]