Abstract
Calcium aluminate cement pastes containing hydrous titania sol-gel particles that were produced by hydrolysis of Ti(OR) 4, (R:C 2H 5, C 3H 7 and C 4H 9) were exposed to steam and air at temperatures up to 1000°C. It was determined that agglomerate particles of anatase crystalline units formed by in-situ sintering in the cement matrices at temperatures ranging from 300° to 850°C, perferentially react with the Ca in the cement. The extent of the interaction between the titania aggregate and the cement was enhanced as the in-situ anatase→rutile phase conversion occured at temperatures > 850°C. This was due to the reactive feature of rutile evolved by the intra-agglomerate densification and crystallite growth of anatase. The titania-cement interaction played a major role in improving the mechanical properties of cement composites at elevated temperatures. It was also observed that higher molecular masses of alcohol resulting from the hydrolysis of alkoxides in the cement resulted in stronger adsorption on the cement particle surfaces, thereby inhibiting the hydration of the cement paste. Thus, the extent of strength improvement resulting from the addition of the alkoxides was on the order of Ti(OC 2H 5) 4 > Ti(OC 3H 7) 4 > Ti(OC 4H 9) 4.
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