Question

In 4^th amendment of IS 456-2000, M60 grade has been shifted
1. to standard concrete from high strength concrete
2. to high strength concrete from standard concrete
3. to standard concrete from an ordinary concrete
4. to ordinary concrete from a standard concrete

Answer 1

Correct Answer - Option 1 : to standard concrete from high strength concrete

Concept: -

As per IS456:2000, Table 2, Amendment 4 –

1) M60 grade has been shifted to standard concrete from high strength concrete

2) M85 to M100 grades are added to high strength concrete.

Group	Grade Designation
Ordinary concrete	M10 – M20
Standard concrete	M25 – M60
High strength concrete	M65 – M100