Grade of Concrete and Mix Ratio of Concrete

Grade of Concrete :

The designation of Concrete according to its compressive strength is called Grade of Concrete.

Following are the different Grade of Concrete, their Mix Proportions, and their compressive strength :

 

Group Grade of Concrete Compressive Strength Mix Ratio
MPa(N/mm2) PSI
Normal or Ordinary Grade
M5
5N/mm2
725 PSI
1:5:10
M7.5
7.5N/mm2
1087 PSI
1:4:8
M10
10N/mm2
1450 PSI
1:3:6
M15
15N/mm2
2175 PSI
1:2:4
M20
20N/mm2
2900 PSI
1:1.5:3
Standard Grade
M25
25N/mm2
3625 PSI
1:1:2
M30
30N/mm2
4350 PSI
Design Mix
M35
35N/mm2
5075 PSI
Design Mix
M40
40N/mm2
5800 PSI
Design Mix
M45
45N/mm2
6525 PSI
Design Mix
High Strength Grade
M50
50N/mm2
7250 PSI
Design Mix
M55
55N/mm2
7975 PSI
Design Mix
M60
60N/mm2
8700 PSI
Design Mix
M65
65N/mm2
9425 PSI
Design Mix
M70
70N/mm2
10150 PSI
Design Mix

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