Use of clay as a pozzolona in high strength Portland cement and its thermal activation  

作　　者：Noor-ul-Amin 

机构地区：[1]Department of Chemistry, Abdul Wali Khan University

出　　处：《Chinese Journal Of Geochemistry》2010年第2期143-145,共3页中国地球化学学报

摘　　要：In this investigation local clay from Cherat mines, Nowshera District, NWFP, Pakistan, has been tested as a pozzolanic material in high strength Portland cement. Thermal treatments were performed as a means of activation of the clay. It was found that thermal treatment of the clay can increase its pozzolanic activity. Different blended mortars, containing different amounts of clay, activated at different temperatures were studied for compressive strength, consistency, and setting times. It was concluded that the mechanical properties of the blended cements were mainly governed by the percentage of incorporation of the calcined clay. Blended cement composition has been for-mulated, with optimal results of 20% calcined clay at a temperature of 600℃.In this investigation local clay from Cherat mines, Nowshera District, NWFP, Pakistan, has been tested as a pozzolanic material in high strength Portland cement. Thermal treatments were performed as a means of activation of the clay. It was found that thermal treatment of the clay can increase its pozzolanic activity. Different blended mortars, containing different amounts of clay, activated at different temperatures were studied for compressive strength, consistency, and setting times. It was concluded that the mechanical properties of the blended cements were mainly governed by the percentage of incorporation of the calcined clay. Blended cement composition has been formulated, with optimal results of 20% calcined clay at a temperature of 600℃.

关 键 词：高强度水泥 烧粘土 热激活 火山灰活性 混合水泥 硅酸盐水泥 巴基斯坦 测试调查 

分 类 号：TU528[建筑科学—建筑技术科学]