Refractory Technology
Grog addition in fireclay during brick manufacture is done to

All of these
Reduce its shrinkage on heating
Enhance the strength of fired refractories
Impart greater spalling resistance

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Refractory Technology
Thermal conductivity of refractory bricks

Increases with the amount of air entrapped in pores
Increases with decrease in porosity
Decreases with decreases in porosity
Is independent of its porosity and is maximum for insulating bricks

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