Influence of Calcium Sulfate State and Fineness of Cement on Hydration of Portland Cements Using Electrical Measurement

作     者：魏小胜 WEI Xiaosheng~1, LI Zongjin~2, XIAO Lianzhen~2, THONG Wangfai~2 (1.Department of Civil Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;2.Department of Civil Engineering, The Hong Kong University of Science & Technology, Kowloon, Hong Kong)

作者机构：Department of Civil Engineering Huazhong University of Science and Technology Wuhan 430074 China 

出 版 物：《Journal of Wuhan University of Technology(Materials Science)》 (武汉理工大学学报（材料科学英文版）)

年 卷 期：2006年第21卷第4期

页      面：141-145页

核心收录：

学科分类：080802[工学-电力系统及其自动化] 0808[工学-电气工程] 08[工学] 

基　　金：Funding by Hong Kong Grant Council(HKUST6226/01E)andtheKey Project of Chinese Ministry of Education(No.105125) 

主　　题：false setting electrical resistivity fineness hydration 

摘      要：The influence of calcium sulfate state and fineness of cement on hydration of Portland cement was studied using electrical resistivity measurement. The bulk resistivity curve of the paste from the abnormal cement mainly with hemihydrate had a characteristic abnormal peak and rapid increase in early period. The resistivity measurement technique can be used to discriminate abnormal setting. For normal cement with gypsum, the increase in fineness of the Portland cement decreases the minimum resistivhy due to a higher ionic concentration and increases the 24 hour resistivity due to a reduction in macroscopic pore size. The setting time, compressive strength, pore structure of pastes made from different cements were carried out to compare the influence of water to cement ratio, calcium sulfate state and fineness. It is found that the electrical and mechanical properties are strongly affected by the initial porosity, the presence of hemihydrate or gypsum, and the fineness of cement.