INTERPRETATION OF MICROSTRUCTURE DEVELOPMENT OF CEMENTITIOUS MATERIALS IN EARLY AGES WITH ELECTRICAL RESISTIVITY MEASUREMENT
In early ages of a cement-based composite, due to progress of hydration, microstructure ofthe composite develops dynamically. In this study, a non-contact electrical resistivitytechnique is used to monitor the hydration process of cement pastes with varyingwater/cement (w/c) ratios. Through interpreting the resistivity measurement, the porositydevelopment in cement-based composites can be revealed. A modified Archies law and a general effective media (GEM) theory have been used torelate resistivity and porosity of cement-based composites. Archies law is an empiricalequation while GEM has a sound theoretical background. The parameter to be determined ism in Archies law. The parameters to be determined are the percolation threshold of capillarypores Φc, the percolation exponent t, and the magnification ratio M of the solid phaseresistivity to the pore solution resistivity for GEM model. The parameters in the models werediscussed for calculating porosity within the cement pastes. It has been found that GEMmodel can be used predict the porosity for a cement-based composite in mature stage once theparameters are determined.
Zongjin Li Lianzhen Xiao Xiaosheng Wei Jie Zhang
Department of Civil Engineering,The Hong Kong University of Science and Technology,Kowloon,Hong Kong Department of Civil Engineering and Mechanics,Huazhong University of Science and Technology,1037 Luo
国际会议
南京
英文
253-262
2008-10-13（万方平台首次上网日期，不代表论文的发表时间）