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As per Indian Standard code of practice for prestressed concrete (IS 1343 — 1980), the minimum grade of concrete to be used for post tensioned and prestressed. structuralelements are respectively
$$M_{20}$$ for both
$$M_{40}$$ & $$M_{30}$$
$$M_{15}$$ & $$M_{20}$$
$$M_{30}$$ & $$M_{40}$$
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