Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume 100, Issue 2, Pages 571-576Publisher
SPRINGER
DOI: 10.1007/s10973-009-0158-5
Keywords
Calcium aluminate cement; Heat of hydration; Portland cement; Setting; Strength
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Calorimetry was applied to an investigation of the early hydration of Portland cement (PC)-calcium aluminate cement (CAC) pastes. The heat evolution measurements were related to the strength tests on small cylindrical samples and standard mortar bars. Different heat-evolution profiles were observed, depending on the calcium aluminate cement/Portland cement ratio. The significant modification of Portland cement heat evolution profile within a few hours after mixing with water was observed generally in pastes containing up to 25% CAC. On the other hand the CAC hydration acceleration effect was also obtained with the 10% and 20% addition of Portland cement. As one could expect the compressive and flexural strength development was more or less changed-reduced in the presence of larger amount of the second component in the mixture, presumably because of the internal cracks generated by expansive calcium sulfoaluminate formation.
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