Relation Between Resistivity Method and Thermodynamic Method on Assessment of Portland Cement Hydration

Abstract

Cement hydration process is commonly investigated via resistivity and thermodynamic measurements. However, the test results of the above methods cannot be compared reasonably due to their different temperature conditions. The influence of temperature on the resistivity and hydration rate was taken into consideration. Based on the equivalent time principle, the magnification, change and acceleration effects of temperature on the resistivity rate were discussed. A theoretical relationship between resistivity and thermodynamic measurements was proposed. The theoretical and experimental studies indicate that the dissolution period and the emergence time of peak during hydration process determined by the two methods have a high consistency. Among all the influencing effects, acceleration is the main effect inducing the major peak of resistivity variation rate.