Thermal expansion/contraction behaviour of some Indian clays.

Abstract

Thermal expansion/contraction behaviour of some clays between room temperature and 950•Ž was measured and their coefficient of expansion plotted against temperature. The results were correlated with various physico-chemical properties. Besides structure of individual sample, particle size, chemical and mineralogical composition significantly effect ed the thermal response of clays, when heated at a constant rate. The changes in coefficient values at elevated temperatures were also found compatible with corresponding fall in the porosity of samples. Minerals contained in clays were quartz, illite, montmo rillonite and kaolinite.