| Traditional minerals namely, calcite and dolomite were substituted
for the wollastonite in the standard glazed wall tile body
.composition. Test specimens of three compositions incorporating
calcite and dolomite along with a standard composition were
fabricated by pressing and firing at three different test temperatures,
viz., 1000°, 1050° and 1100°C in an electric furnace. Dry
and fired properties of the specimens were determined and compared
with those of the standard composition. It was observed
that the percent water absorption, fired strength (MOR) and craze
resistance of the optimized body composition with complete
replacement of wollastonite conformed to the requirements of
BIS specification at the test firing temperature of about 1100°C
with 2 h dwelling time which was, however, slightly higher by
30° to 40 oc than that of the standard wall tile body composition. |
