Different Concrete Grades and Uses

Concrete quality is represented by means of quality grade which is, in turn, is represented by means of a grade ( M20, M30 ..etc) that denotes the characteristic compressive strength of concrete. Here, we will discuss minimum grade of concrete, the different concrete grades and their uses in concrete construction.

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Different Grades of Concrete

The table below shows the different mixes represented by "M' with their respective mix proportions and compressive strength.

Minimum Grade of Concrete

The selection of the minimum grade of concrete is completely dependent on the:

• Durability
• Environmental features
• External loads

For mild exposures, the minimum grade of concrete employed must be M20. For higher and aggressive environmental conditions, the grade selected must be higher. If the environmental conditions are categorized as moderate, severe, very severe and extreme, then the grade of concrete required must be M25, M30, M35, and M40.
Please keep in mind that, higher grades are not recommended in the need for higher strength, but in the need for higher durability and resistance against environmental actions.

Uses of Different Grades of Concrete

The uses of different grades of concrete or the best job they can employ are enlisted in the table below. Applications of a few initial concrete are explained below.