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When the cement paste is filled in mould and kept in water. Then what should be the temperature of water?

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When the cement paste is filled in mould and kept in water. Then what should be the temperature of water?

(a) 24-35°C

(b) 20°C

(c) 30-40°C

(d) 50°C

This question was addressed to me during an interview.

My question is taken from Soundness of Aggregates topic in chapter Aggregates and Testing of Aggregates of Concrete Technology

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The correct choice is (a) 24-35°C

To explain I would say: A small weight is placed at top and the whole assembly is submerged in water for 24 hours. The temperature of water should be between 24°C to 35°C.

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