Instead of water, use PVA glue diluted in water.

A cement-sand mortar is prepared from high-strength cement M400 and clean construction sand in a 1: 3 proportion. In this case, the sequence is important: the mixture is poured into the water, and not vice versa. Thoroughly and repeatedly the solution is mixed. Instead of water, use PVA glue diluted in water. In this dairy color, the solution is filled up and the mixture.