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

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

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

by