Discussion
Assertion : Works where concrete is subjected to high temperatures, frost and acidic action, high alumina cement is used.
Reason : The compressive strength of high alumina cement is very low.
Answer: B
Assertion is true but Reason is false.
High alumina cement resists high temperatures, frost and chemical attack, including acids and sulphates, so it is used in refractory concrete, furnaces and works exposed to aggressive conditions. The assertion is true.
The reason is false: high alumina cement is a rapid-hardening cement that develops very high early strength, gaining in a day what ordinary Portland cement gains in weeks. Its known weakness is loss of strength over time through 'conversion' in warm, wet conditions, not low strength as such.
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