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Interpretation of microstructure development of cementitious materials in early ages with electrical resistivity measurement



Title: Interpretation of microstructure development of cementitious materials in early ages with electrical resistivity measurement
Author(s): Z. Li, L. Xiao, X. Wei, J. Zhang
Paper category : conference
Book title: International Conference on Microstructure Related Durability of Cementitious Composites
Editor(s): W. Sun, K. van Breugel, C. Miao, G. Ye and H. Chen
Print-ISBN: 978-2-35158-065-3
e-ISBN: 978-2-35158-084-4
Publisher: RILEM Publications
Publication year: 2008
Pages: 253 - 262
Total Pages: 10
Nb references: 20
Language: English


Abstract: In early ages of a cement-based composite, due to progress of hydration, microstructure of the composite develops dynamically. In this study, a non-contact electrical resistivity technique is used to monitor the hydration process of cement pastes with varying water/cement (w/c) ratios. Through interpreting the resistivity measurement, the porosity development in cement-based composites can be revealed.
A modified Archie’s law and a general effective media (GEM) theory have been used to relate resistivity and porosity of cement-based composites. Archie’s law is an empirical equation while GEM has a sound theoretical background. The parameter to be determined is m in Archie’s law. The parameters to be determined are the percolation threshold of capillary pores ?c, the percolation exponent t, and the magnification ratio M of the solid phase resistivity to the pore solution resistivity for GEM model. The parameters in the models were discussed for calculating porosity within the cement pastes. It has been found that GEM model can be used predict the porosity for a cement-based composite in mature stage once the parameters are determined.


Online publication: 2009-06-09
Publication type : full_text
Public price (Euros): 0.00