Search

Your search keyword '"Sharp, J.H."' showing total 26 results
Start Over Author "Sharp, J.H." Journal cement and concrete research
26 results on '"Sharp, J.H."'

21. The effect of temperature upon the setting behaviour of refractory calcium aluminate cements

Author

Bushnell-Watson, S.M. and Sharp, J.H.

Abstract

A setting time parameter has been determined from the heat evolution versus time curve measured by means of a thermocouple embedded in the cement paste as well as by the Gillmore needle. The setting time increases with increasing temperature, until it reaches a maximum between 26 and 30°C, for four out of the five refractory calcium aluminate cements studied. This anomalous retardation is not, therefore, restricted to ciment fondu, as reported elsewhere. The rate of consumption of CA during the first 24 hours of hydration as determined by X-ray diffraction also indicated a retardation at 30°C compared with 20°C for Secar 51 and Secar 71. The cause of the anomaly cannot be the presence of C2S, which is virtually absent in most of the cements studied. An alternative explanation must be found, which should also explain why Secar 80 behaves differently from the other cements investigated.

Published
1986
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results