Answer / bharat

Ordinary concrete M-10, M-15, M-20
Standard concrete M-25,30,35,40,45,50,55
High strength concrete M-60,65,70,75,80


specified char. comp. strength of 150 mm cube at 28 days in N/
mm^2.
For ordi. concrete it is 10, 15, 20.
For Standard concrete it is 25,30,35,40,45,50,55.
For high Strength concrete it is 60,65,70,75,80

Answer / sridhar

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