As per IS Specifications, the heat of hydration of low-heat Portland cement for 28 days is-
A
Not more than 100 calories/gm
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B
Not more than 50 calories/gm
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C
Not more than 75 calories/gm
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D
Not more than 150 calories/gm
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Solution
The correct option is C Not more than 75 calories/gm As per IS code specifications, the heat of hydration of low heat Portland cement for 28 days is not more than 75 calories/gm.
As per IS 4031 : 1988, the heat of hydration of low-heat Portland cement for 7 days should not be more than 65 calories per gram. The heat of hydration should not be more than 272 and 314 J/gm at the end of 7 and 28 days.