Multiple choice

As per India 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

  1. M20 for both

  2. M40 and M30

  3. M15 and M20

  4. M30 and M40
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

 As per code minimum grade concrete used for post-tension is M-30 and pre-tension is M-40. Reason for this is that in pre-tension losses are more than post-tension and a high strength concrete required for pre-stress so that it can safely bear the high local stress.

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