We use various grades of cement for various areas of the building.
We're able to say the quality of concrete may be the only factor we do care great deal while concreting.
In this article, we will explain that at length.
In fact, what do we suggest by grade of cement.?
Concrete grades are denoted by M10, M20, M30 in accordance with their compressive strength.
The âMâ?denotes Mix design of concrete accompanied by the compressive strength number in N/mm2
âMixâ?may be the respective ingredient proportions which are Cement: Sand: Aggregate Or Cement: Fine Aggregate: Coarse Aggregate.
we already discussed the mix design here.
If we mention M10 concrete, this means that the concrete has 10 N/mm2 characteristic compressive strength at 28 days.
The Minimum grade of concrete for Plain Cement Concrete (PCC) is M15
The Minimum grade of concrete for Reinforced Cement Concrete (RCC) is M20
Concrete Grade and Mix Ratio Table
According to IS 456:2000, the grades significantly less than M20 shouldn't be found in RCC works
|Group||Concrete Grade||Mix Ratio||Characteristic Compressive Strength (N/mm2)|
|Ordinary Concrete||M5||1 : 5 : 10||5 N/mm2|
|M7.5||1 : 4 : 8||7.5 N/mm2|
|M10||1 : 3 : 6||10 N/mm2|
|M15||1 : 2 : 4||15 N/mm2|
|M20||1 : 1.5 : 3||20 N/mm2|
|Standard Concrete||M25||1 : 1 : 2||25 N/mm2|
|M30||Design Mix||30 N/mm2|
|M35||Design Mix||35 N/mm2|
|M40||Design Mix||40 N/mm2|
|M45||Design Mix||45 N/mm2|
|M50||Design Mix||50 N/mm2|
|High Strength Concrete||M55||Design Mix||Â 55 N/mm2|
|M60||Design Mix||Â 60 N/mm2|
|M65||Design Mix||Â 65 N/mm2|
|M70||Design Mix||Â 70 N/mm2|
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