Tm. Salem, THE ELECTRICAL CONDUCTANCE AND HYDRATION KINETICS OF ARTIFICIAL POZZOLANA-CEMENT PASTES, Journal of Materials Science, 31(20), 1996, pp. 5299-5303
Artificial pozzolana were made by firing of two types of clays at two
temperatures (600 and 700 degrees C). Different artificial pozzolana-P
ortland cement pastes were made using a water/cement ratio of 0.40 by
weight of the cement blend. Each cement paste was examined for hydrati
on kinetics at 20 degrees C as well as electrical conductance at 20 an
d 35 degrees C. The results of hydration kinetics indicated a sort of
phase transformation of hydration products at the intermediate stages
of hydration. Electrical conductance studies demonstrated two maxima a
t 20 degrees C; only one maximum at 35 degrees C was detected at the e
arly stages of hydration. All results could be related to the sequence
of the initial hydration reaction and the mode of disruption of the e
lectrically insulating coating layers around the grains of the cement
constituents.