TY JOUR TI HEAT EXCHANGE IN FOAM CONCRETE REINFORCED BY POLYETHYLENE TEREPHTHALATE FIBER (PET FIBER) KW holographic interferometry KW Mach-Zehnder interferometer KW heat transfer KW foam concrete KW polyethylene terephthalate fiber (PET fiber) JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Domnina, K.L. AU Pivarčiová, E.. AU Repko, V.N. AU Sotnikova, M.V. PY 2019 IS 4 PB Belgorod State Technological University named after V.G. Shukhov