Cold crushing strength of ordinary fireclay brick is about 950 kg/cm2. On exposure to a temperature of about 1500°C, its crushing strength may come down to as low as ______________ kg/cm2?
Correct answer: D. 65
- A. 450
- B. 250
- C. 150
- D. 65
Explanation
At high temperature, fireclay brick loses much of its cold crushing strength because its structure softens and undergoes mineral transformations. For ordinary fireclay brick at about 1500°C, the value may fall to roughly 65 kg/cm².
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