Study of rehydration of Portland blast-furnace slag cement subjected to heat treatment.

Dr. Aloízio Geraldo Araújo Júnior

Abstract


Researchers have studied the dehydration and rehydration of Portland cement. In this study, hydrated cement pastes (HCPs) prepared from Portland blast furnace slag cement (PBFSC), were heat treated at 700ºC and 900ºC and used in the preparation of rehydrated cement powders in air (RCPs-air) and rehydrated cement paste (RCPs) with water/cement ratios (w/c) of 0.3 and 0.5. X-ray diffraction (XRD) analyses of the RCPs-air and RCPs indicated the occurrence of pozzolanic reactions during rehydration. RCPs were also prepared from 0, 10, 20 and 40% RCPs-air relative to PBFSC. RCPs prepared with w/c=0.5 showed higher temperatures than RCPs prepared with w/c=0.3. Pastes prepared with w/c=0.5 from 0, 10 and 20% RCP-air and paste prepared with w/c=0.3 from 0 and 10% RCPs-air, showed similar properties. For concentrations greater than these, there was a decrease in compressive strength.


Keywords


cement paste; rehydrated cement paste; rehydration; compressive strength; porosity.

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