Roofing tile clays of India: physico-chemical characteristics for their selection

Thc common clays, namely blue clay and yellow clay from Kerala and red clay and black clay from Morbi, Gujarat have been selected for studying their physico-chemical properties which involve chemical analysis, plasticity test, particle size analysis, X-ray diflractometry, drying and firing characteristics, rational analysis etc. The results indicate that for both regions, it is not possible to make tiles or other products by using one type of clay alone. A combination of both the clays available in the same region can impart appropriate properties conducive to satisfactory production