Thermal analysis of hydrated calcium aluminates View Full Text


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Article Info

DATE

1996-09

AUTHORS

S. K. Das, A. Mitra, P. K. Das Poddar

ABSTRACT

Differential scanning calorimeter (DSC) has been used to study the dehydration characteristics of hydrated calcium aluminates such as CA, CA2 and C12A7 where C and A stand for CaO and Al2O3 respectively. Dehydration of CAH10 and C2AH8 (whereH=H2O) occur ∼ at 160–180°C and 200–280°C respectively. These two phases are unstable and ultimately get transformed to AH3 and C3AH6. Dehydration of AH3 and C3AH6 occur between 290 and 350°C and overlap at lower scanning rate. The activation energy for dehydration of the stable AH3 and C2AH6 phases has been found to be 107.16 and 35.58 kJ mol−1 respectively. The compressive strength of the hydrated calcium aluminates has been determined. The result shows that in the case of CA, almost 90% of ultimate strength has been attained in 1 day whereas in CA2, ultimate strength has been attained in 14 days and in C12A7 in 1 day. DSC results have been correlated with the rate of strength developments. More... »

PAGES

765-774

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Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf01981812

DOI

http://dx.doi.org/10.1007/bf01981812

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1013128653


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