Thermal analysis of hydrated calcium aluminates

Das, Swapan K and Mitra, A and Daspoddar, P K (1996) Thermal analysis of hydrated calcium aluminates. Journal of Thermal Analysis, 47 (3). pp. 765-774.

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Differential scanning calorimeter (DSC) has been used to study the dehydration characteristics of hydrated calcium aluminates such as CA, CA(2) and C(12)A(7) where C and A stand for CaO and Al2O3 respectively. Dehydration of CAH(10) and C(2)AH(8) (where H=H2O) occur at 160-180 degrees C and 200-280 degrees C respectively. These two phases are unstable and ultimately get transformed to AH(3) and C(3)AH(6). Dehydration of AH(3) and C(3)AH(6) occur between 290 and 350 degrees C and overlap at lower scanning rate. The activation energy for dehydration of the stable AH(3) and C(2)AH(6) 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 CA(2), ultimate strength has been attained in 14 days and in C(12)A(7) in 1 day. DSC results have been correlated with the rate of strength developments.

Item Type:Article
Official URL/DOI:
Uncontrolled Keywords:Hydrated calcium aluminates
Divisions:Material Science and Technology
ID Code:1041
Deposited By:Sahu A K
Deposited On:15 Jun 2010 12:36
Last Modified:14 Dec 2011 14:37
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