### How to calculate materials for different-ratio concrete - A Civil Engineer

5 Mar 2013 ... Concrete aggregate. Stone chips ... If we mix cement, sand and brick chips at 1:2:4 ratio the 28 days cube test result will come around 3000 psi, which is referred for slab concrete. I will estimate materials for 1:1.5:3 ... Now lets estimate the required materials for the volume of 100 cft concrete of 1:1.5:3 ratio:.