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 |
|---|---|
| Uncontrolled Keywords: | Hydrated calcium aluminates |
| Subjects: | Materials Science |
| Divisions: | Material Science and Technology |
| Depositing User: | Users 5 not found. |
| Date Deposited: | 15 Jun 2010 07:06 |
| Last Modified: | 14 Dec 2011 09:07 |
| URI: | http://eprints.nmlindia.org/id/eprint/1041 |
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