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The hydration of 12CaO.7A12O3 at different temperatures

✍ Scribed by R.N. Edmonds; A.J. Majumdar

Publisher
Elsevier Science
Year
1988
Tongue
English
Weight
321 KB
Volume
18
Category
Article
ISSN
0008-8846

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✦ Synopsis

The hydration behavlour of CL2A~, a component of many calcium aluminate cements, has been studied over a range of temperature using conduction calorimetry, X-ray and thermal analysis techniques.

At 4oc, hydration occurs about 2 hours after mixing; hydration is slower at 20Β°C but at 40Β°C a very rapid reaction is observed.

The initial hydration products are C2AH , together with CAH,o or alumina gel; considerable amounts of amorphous material are always also formed.

At 20oc and above these initial products slowly convert to C,AH,; the conversion becomes faster with increasing temperature.

The enthalpies of the hydration and conversion reactions were measured by conduction calorimetry.

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