Question

$M40$ concrete is preferred to $M20$ concrete for prestressed concrete to

• A. overcome bursting stresses at the ends
• B. avoid brittle failure of concrete
• C. eliminate the effect of shrinkage
• D. economize the use of cement

Answer 1

The correct option is A overcome bursting stresses at the ends

In M40 concrete, shrinkage will be less than that in M20 concrete. M40 concrete is more brittle than M20 concrete.