Grade of Concrete:
IS 456:2000, "Code of Practice for Plain and Reinforced
Concrete," is the Indian Standard (IS) code used to specify the grades of
concrete. For the design and building of reinforced concrete structures, this
code is utilized.
A number is used to identify the various grades of concrete,
followed by the letter "M," which stands for "Mix." The
amount in megapascals (MPa) represents the concrete cube's typical compressive
strength at 28 days.
|
Grade
of Concrete |
Concrete Mix ratio |
Compressive Strength (Mpa-N/mm2) |
|
Initial
grades/Normal grades of concrete |
||
|
M5 |
1:5:10 |
5 |
|
M10 |
1:3:6 |
10 |
|
M15 |
1:2:4 |
15 |
|
M20 |
1:1.5:3 |
20 |
|
Mid
grades/Standard grades of concrete |
||
|
M25 |
1:1:2 |
25 |
|
M30 |
Design mix |
30 |
|
M35 |
Design mix |
35 |
|
M40 |
Design mix |
40 |
|
M45 |
Design mix |
45 |
|
High strength
concrete grade |
||
|
M50 |
Design mix |
50 |
|
M55 |
Design mix |
55 |
|
M60 |
Design mix |
60 |
|
M65 |
Design mix |
65 |
|
M70 |
Design mix |
70 |
Important points:
- Concrete less than M20 grade shouldn’t be used in RCC as per IS 456:2000
- M10 is used in the base of footing, levelling works and in road construction. Whereas, M15 is used as PCC, and used for same purpose as M10.
- After M25, all the grade of concrete should be done mix design as per IS 10262-2009.
Based on the anticipated construction's load-bearing
capability and structural requirements, the suitable grade of concrete is
selected. When choosing the right grade of concrete for your particular
project, always consult the advice of a civil engineer or follow to local
building laws and standards.
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