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2.4 TYPE OF CONCRETE GRADES AND RATIOS 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. Concrete mixes are defined in ascending numbers of 5, starting at 10, and show the compressive strength of the concrete after 28 days. For instance, C10 has the strength of 10 newtons, C15 has the strength of 15 newtons, C20 has 20 newtons strength and so on. 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. You can see other examples 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 7PDF Image | concretes that use polymers as a binder
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