Grades Of Concrete Daily Civil
Grades Of Concrete: In IS: 4561978, the different grades of concrete are given as M10, M25, M20, M25, M30, M35, and M40. In the classifiion of concrete mix, the letter M denotes the Mix and the numbers 10, 15, 20, 25, 30, 35, 40 represent the predetermined works cube strength of 15 cm cubes after curing of 28 days in N/mm2.