Q.

Prestressed concrete although it is water tight, it is not                      

A. gas tight
B. liquid tight
C. vapour tight
D. material tight
Answer» A. gas tight
Explanation: tanks have been built for storing liquid oxygen at 230 degrees with capacities up to one million liters and prestressed concrete, although water tight, it is not gas tight were vapours under pressure are to be stored and in such cases, a thin membrane linear of steel provides rigidity and increases the steel tensile capacity of the pretressed concrete.
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