Different Types of Concrete Grades

 

Different Types of Concrete Grades

Grades of concrete are defined by the strength and composition of the concrete, and the minimum strength the concrete should have following 28 days of initial construction. The grade of concrete is understood in measurements of MPa, where M stands for mix and the MPa, denotes the overall strength. 

Different mixes (M) come in various mix proportions of the various ingredients of cement, sand and coarse aggregates. For instance, M20 comes in the respective ratio of 1:1.5:3.  Below in the table.

 

Concrete Grade Mix Ratio (cement: sand: aggregates)             Compressive Strength

                                                                                                                    MPa (N/mm2) psi

           Grades of Concrete

 

 M5                    1:5:10                                                                                 5 MPa              725 psi

 M7.5                 1:4:8                                                                                   7.5 MPa           1087 psi                                                         M10                  1:3:6                                                                                   10 MPa            1450 psi          

 M15                  1:2:4                                                                                   15 MPa            2175 psi

 M20                  1:1.5:3                                                                                20 MPa            2900 psi

       

         Standard  Grade of Concrete

 

 M25                  1:1:2                                                                                   25 MPa            3625 psi  

 M30                  Design Mix                                                                        30 MPa            4350 psi

 M35                 Design Mix                                                                         35 MPa            5075 psi

 M40                 Design Mix                                                                         40 MPa            5800 psi

 M45                  Design Mix                                                                        45 MPa            6525 psi

 High Strength Concrete Grades

 M50                 Design Mix                                                                         50 psi               7250 psi

 M55                 Design Mix                                                                         55 psi               7975 psi

 M60                 Design Mix                                                                         60 psi               8700 psi

 M65                 Design Mix                                                                         65 psi               9425 psi

 M70                 Design Mix                                                                         70 psi               10150 psi