Cement mortar consists of cement, fine aggregate, water and lime, active admixture or additives added as needed, and is divided into cement mortar and cement mixed mortar.
Generally, 1: 3 cement mortar is made of 1 unit weight cement and 3 unit weight sand, which actually ignores the composition of water, and the ratio is generally around 0.6, that is, it should be 1: 3: 0.6, and the density of cement mortar is 2000Kg/m3.