M10 M15 M20 CONCRETE
M10, M15, M20 etc. are all grades of concrete, The 'M' denotes 'Mix' followed by a number representing the compressive strength of that mix in N/mm². A mix is a specific ratio in which cement, fine(sand) and coarse aggregate(gravel) are mixed. M15 means a 150 mm cube cast from the concrete mix designed for the number. Continuously, M10, M20 is 100mm & 200mm cube cast for the concrete. For example, M20 concrete is supposed to have a compressive strength of at least 20 N/mm², 28 days after casting. Concrete Mix Design Grade of Cement Mix Ratio Water per bag (50kg ) of Cement M 5 1 : 5 : 10 60 litre M 7.5 1 : 4 : 8 45 litre M 10 1 : 3 : 6 34 litre M 15 1 : 2 : 4 32 litre M 20 1 : 1.5 : 3 30 litre...