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Question

As per Indian standard code of practice for pre-stressed concrete
(IS : 1343-1980) the minimum grades of concrete to be used for post-tensioned and pre-tensioned structural elements are respectively

A
M-20 for both
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B
M-40 and M-30
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C
M-15 and M-20
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D
M-30 and M-40
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Solution

The correct option is D M-30 and M-40
As per code IS : 1343-1980,
Minimum grades of concrete to be used for
Post tensioned member = M 30
Pre tensioned member = M 40

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