SYMPOSIA PAPER Published: 01 January 1984
STP30269S

The Effect of Sorbed Water on the Determination of Phase Composition of CaSO · H O Systems by Various Methods

Source

The efficiency of calcination processes is monitored by careful phase analysis of CaSO4 · H2O systems. The usual method of determining a small amount of gypsum in such systems involves the determination of sorbed (free) water, water of crystallization (combined water), and Ca++/SO4−− ratio. The removal of free water from CaSO4 · ½H2O and active orthorhombic calcium sulfate occurs at about the same temperature range as the decomposition of CaSO4 · 2H2O, which then becomes a most critical stage in the phase analysis of these systems. This paper discusses (1) relative merits of various methods utilized in removing free water, which includes several thermal methods and microwave drying, and (2) the state of the sorbed water as it develops from exposure to radically varying relative humidity conditions.

Author Information

Turk, DH
United States Gypsum Company, Graham J. Morgan Research Center, Libertyville, IL
Bounini, L
United States Gypsum Company, Graham J. Morgan Research Center, Libertyville, IL
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Details
Developed by Committee: C11
Pages: 48–56
DOI: 10.1520/STP30269S
ISBN-EB: 978-0-8031-4918-2
ISBN-13: 978-0-8031-0219-4