Abstract
The effect of progressive replacement of limestone by marble waste on the thermo-mechanical properties of a traditional earthenware wall tile composition has been studied. It was observed that the body mixes containing more than 7.5 wt % of marble waste showed a marginal decrease in dry strength and bulk density while particle size distribution were almost identical.The body mixes containing up to 7.5 wt % of marble waste showed improvement in fired properties in the biscuit firing temperature range of 1000 o to 1100 oC.A reverse trend was observed beyond this temperature range due to an increased proportion of high expansion residual quartz.The body mixes containing up to 7.5 wt % of marble waste showed significant reduction in percent thermal expansion at 600 oC in the sample fired at 1100 oC. As a result, the body mixes become more thermal shock resistant compared to the reference body.The study concluded that marble waste can be added in small amounts (7.5 % or less) in earthenware wall tile improving their thermo-mechanical properties.
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