# proportion of all grade of cement concrete ie. m5 to m80

proportion of all grade of cement  concrete  ie. m5 to m80

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It is designation of grades of concrete mix. Letter M refers to the mix and number to specified characteristic compressive strength of 15 cm cube at 28 days expressed in N/square mm. Thus M 15 concrete means a concrete of characteristic strength 15N/square mm. Grades of concrete lower than M 15 shall not be used in reinforced concrete. (Note - N = Newton, mm = milimetre)

Mixing Ratio for Concrete in:

M5

* Mix ratio for M5 concrete is 1:5:10

* compressive strength is 5N/mm2 @ 28 days.

* 1 part of cement, 5 parts of sand, 4 parts of coarse aggregate.

M10

Ratio used in M10 concrete is 1:3:6 1 Cement, 3 Sand & 6 Aggregate

M15

1:2:4

M25

(1:1:2)

M30

1:1:2 (Nominal Mix)

M35

3.15 : 2.62 : 2.67

M- 40 is strongest It depends upon the design mix, . M-40

means its strengthis 40n/mm2

Water: cement: F.A.: C.A. = 0.4: 1: 1.65: 2.92

Strengh of M20 = 20 MPa

Strengh of M25 = 25 MPa

Strengh of M30 = 30 MPa

Strengh of M35 = 35 MPa

Strengh of M40 = 40 MPa

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