what is the meaning of M15,M20,M25 concrete?
1 Answer
Grade of concrete is defined as the minimum strength the concrete must posses after 28 days of construction with proper quality control. Grade of concrete is denoted by prefixing M to the desired strength in MPa.
- M15 concrete mix has a mix proportion of 1:2:4 of cement, fine aggregate, and coarse aggregate respectively. M15 – M represents Mix and 15 N/mm2 is the characteristic compressive strength of concrete cube at 28 days. Contents: Required Data M15 Grade Concrete.
- for a grade of concrete with 20 MPa strength, it will be denoted by M20, where M stands for Mix. These grade of concrete is converted into various mix proportions. For example, for M20 concrete, mix proportion will be 1:1.5:3 for cement:sand:coarse aggregates.
- M25 grade concrete is type of grade of concrete that would achieve a compressive strength of 25 N / mm2 after 28 days of curing period of initial construction.