Title:
Preliminary Interpretation of Portland Cement Hydration Process Using Resistivity Measurements
Author(s):
Zongjin Li, Xiaosheng Wei, and Wenlai Li
Publication:
Materials Journal
Volume:
100
Issue:
3
Appears on pages(s):
253-257
Keywords:
cement; hydration; setting
DOI:
10.14359/12627
Date:
5/1/2003
Abstract:
A noncontacting electrical resistivity measurement device was recently invented to monitor and interpret the hydration process of cement paste with different water-cement ratios (w/cs). The minimum critical point M(t(m),r(m)), level end critical point L(t(l), r(l)), and inflection point I(t(i), r(i)) on resistivity curves were identified to divide the hydration process into a dissolving period, competition period, setting period, and hardening period. It is found that the resistivity curve is similar to curves of heat evolution of cement. The study showed that the new electrical resistivity device provides a sensitive and effective tool to monitor and interpret the hydration process of cement.