Measurement of Free Water and Combined Water of Gypsum

Mark Flumiani, Jim Turner and Virginia Trimble (CertainTeed Gypsum Canada)
Presented at ASTM C11 Centennial Symposium on Advances in Gypsum Technologies and Building Systems, Anaheim, 2015
Printed in ASTM STP1588

In 2011, ASTM committee C11 undertook a task to update the existing gypsum test standard to include automated moisture balance methods. In a preliminary experiment described here, a few variations in automated free and combined water methods were compared to the existing manual "oven" methods to evaluate differences in results.