how to calculate 1:2:4 ratio concrete cement, sand, metal ...
2 is the mixing of propotion soolution of metal = *4= 4 is the mixing of propotion say i cum of cement conceret 1:2:4 ratio cement = bags sand = cums metal = cums this is one type of solution unit weight of cement is 1440kg/cum sand 1660 to 1800kg/cum Unit weight of metal is 1630kg to 2000kg/cum so cenment = /7=