The letter ‘M’ and the number stands for Mix and characteristic compressive strength of 150 mm cube at 28 days.
So M 30 grade of concrete means the concrete mix which attains 28 day strength as 30 MPa or 30 N/mm2.
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The letter ‘M’ and the number stands for Mix and characteristic compressive strength of 150 mm cube at 28 days.
So M 30 grade of concrete means the concrete mix which attains 28 day strength as 30 MPa or 30 N/mm2.