On masonry restoration mortars’ cold resistance

The results of studies of various masonry mortars obtained on the basis of various binding materials are given. The "Horizon 95” laboratory has developed modified lime mortars on the basis of natural dense and porous sands to restore the stone structures of the ancient Armenian monuments. As a basic requirement for restoration mortars serves their resistance against the destructive influence of the environment, while the cold resistance of the material is one of the most important quality indicators. It is approved that the processed restoration mortars’ cold resistance is $F100$ and $F150$.