CAD for Creators

  Common Concrete Grades and Their Strength oncrete grades represent the strength and composition of concrete and are denoted in terms of MPa (megapascals) of compressive strength at 28 days. The grade is expressed as M followed by a number (e.g., M20, M25, etc.), where "M" stands for "Mix" and the number indicates the strength in MPa. Common Concrete Grades and Their Strength Grade Mix Ratio (Cement : Sand : Aggregate) Strength (MPa) Water-Cement (W/C) Ratio M5 1 : 5 : 10 5 MPa 0.60 – 0.75 M7.5 1 : 4 : 8 7.5 MPa 0.60 – 0.75 M10 1 : 3 : 6 10 MPa 0.50 – 0.60 M15 1 : 2 : 4 15 MPa 0.50 – 0.60 M20 1 : 1.5 : 3 20 MPa 0.45 – 0.55 M25 1 : 1 : 2 25 MPa 0.40 – 0.50 M30 Design ...