Single-component special mortar for laying and simultaneous grouting of glass-brick elements, based on high-strength PTL 52.5R cements, spheroidal quartz and synthetic additives. Suitable for grouting, free of shrinkage, joints from 2 to 20 mm wide. It can also be used for grouting joints from 2 to 20 mm wide in all types of ceramic tiles (including klinker and porcelain stoneware) and natural stone.