Portland cement pastes, slag cement pastes, and slag-lime pastes were
prepared using the initial water solid ratios of 0.25 and 0.40 to prod
uce low-porosity and normal-porosity pastes, respectively. Electrical
conductance was measured as a function of time of hydration, at 30 and
45 degrees C for each paste. The variations of the electrical conduct
ivity with hydration, time could be related to the hydrolysis and the
later formation of hydration products in, each of. the cement pastes.
The mechanism of cementing action during the early stages of hydration
of each paste seems to be responsible for the observed variations in
electrical conductance.