TY JOUR TI THE CRUCIAL ROLE OF THE MORTAR COMPONENT IN THE RESISTANCE OF THE MASONRY COMPRESSION FORCE KW structural heterogeneity KW the efficiency of the stone in the masonry KW stone bending KW stress-strain state JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Donchenko, O.M. AU Degtev, I.A. AU Tarasenko, V.N. PY 2017 IS 2 PB Belgorod State Technological University named after V.G. Shukhov