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Influence of Ca(OH)2 and CaSO4 · 2H2O on hydration reaction of amorphous calcium aluminate

✍ Scribed by K. Nakagawa; I. Terashima; K. Asaga; M. Daimon

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
672 KB
Volume
20
Category
Article
ISSN
0008-8846

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✦ Synopsis

The influences of Ca(OH)z and CaSO4 • 2I-I20 on the hydration of amorphous calcium aluminate with the chemical composition similar to C,zA7 were studied by determining the degree of hydration according to the selective dissolution method.

The hydration reaction of amorphous calcium aluminate progresses very rapidly and amorphous AH3 is produced along with C2AH8. The reaction is retarded slightly by the addition of Ca(OH)2. When a small amount of Ca504 • 2H20 is added, the degree of hydration is increased compared with the case of no addition. However, the hydration reaction is greatly retarded, in the presence of large amount of CaSO, • 2HH.~O. When Ca(OH)z and CaSO, • 2H20 are added, the retarding effect is larger than in the case of adding 1 mole of CaSO, • 2H20 alone.

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