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Building Materials

Q1:

With storage, strength of cement

A increases

B decreases

C remains the same

D none to these.

ANS:B - decreases

For 3months, the storage decrease the strength up to @15% after 6months it should be 30% after 1year increase up to 50% of the strength of cement. Period of Storage - Relative Strength (percent) at 28 days
Fresh - 100%
3 months - 80%
6 months - 70%
1 year - 60%
5 year - 50% Because of exposure C3A reacts with environment, gradually strength decreases.



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