Different Grades of Concrete & Mix Ratio


Different Grades of Concrete & Mix Ratio

Grade Characteristic Strength Nominal Mix Ratio (C : S : A) Typical Use
M5 5 N/mm² 1 : 5 : 10 Levelling, base concrete
M7.5 7.5 N/mm² 1 : 4 : 8 Mass concrete, bedding
M10 10 N/mm² 1 : 3 : 6 PCC, flooring
M15 15 N/mm² 1 : 2 : 4 PCC, foundations
M20 20 N/mm² 1 : 1.5 : 3 RCC, slabs, beams, columns
M25 25 N/mm² 1 : 1 : 2 RCC works
M30 and above ≥30 N/mm² Design Mix High-strength RCC, bridges, structures

C = Cement, S = Fine Aggregate (Sand), A = Coarse Aggregate

Important Note

  • M20 means concrete having a characteristic compressive strength of 20 N/mm² at 28 days.
  • Nominal mix proportions are generally used for lower grades. M25 and higher grades are normally produced using design mix, rather than simply using a fixed nominal ratio.
  • Actual mix proportions depend on materials, water-cement ratio, workability, exposure conditions, and the applicable standard.

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