According to IS 456-2000, the minimum grade of concrete with maximum free water to cement ratio of 0.5 and minimum cement content of 300 kg/m3 is
1
M20
2
M30
3
M25
4
M35
According to IS 456-2000, the minimum grade of concrete with maximum free water to cement ratio of 0.5 and minimum cement content of 300 kg/m3 is