Sep 06 2019· Crush sand is 1 25 cft its dlbd say 50 Kg cft Its weight according to proportion would be 1 25 × 50 = 62 5 Kg 20mm Volume is 2 5 cft and dlbd is 45 kg cft Weight will be 2 5 × 45 = 112 5 kg So your proportion of aggregates by weight for 1 bag of cement will be Cement = 50 kg Crush Sand = 62 5 Kg 20mm = 112 5 kg