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As per Indian Standard specifications, standard concrete is designated into

As per Indian Standard specifications, standard concrete is designated into Correct Answer 7 grades

As per IS 456: 2000, table 2, standard concrete is designated into 7 grades.

Group

Grade Designation

Specified Characteristic compressive strength of 150 mm cube at 28 days in N/mm2

Ordinary Concrete (3)

M10

10

M15

15

M20

20

Standard Concrete (7)

M25

25

M30

30

M35

35

M40

40

M45

45

M50

50

M55

55

High Strength Concrete (5)

M60

60

M65

65

M70

70

M75

75

M80

80

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