Grog addition in fireclay during brick manufacture is done to_________________?
Correct answer: B. All A., B. and C.
- A. Reduce its shrinkage on heating
- B. All A., B. and C.
- C. Enhance the strength of fired refractories
- D. Impart greater spalling resistance
Explanation
Grog is already-fired, crushed fireclay, so it reduces shrinkage during reheating and improves resistance to thermal shock or spalling. It also contributes to the strength and dimensional stability of the fired brick, making all three effects applicable.
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