When laying bricks, Bian Xiao found that many friends still don't know the proportion of cement and sand, and the dosage is different according to the cement grade and sand quality. Generally speaking, the lime-sand ratio of brick walls is 1:6. Yes 1 kg cement and 6 kg sand. It is better to put 1 kg lime on this basis, and the purpose of adding lime is to increase the bonding force between brick and setting material.