TY JOUR TI CHANGES IN THE STRUCTURAL AND PHASE COMPOSITION OF CEMENT CONCRETE DURING MICROBIOLOGICAL CORROSION KW microbiological corrosion KW concrete corrosion KW bacterial corrosion KW fungal corrosion KW X-ray analysis KW concrete strength JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Strokin, K.B. AU Novikov, D.G. AU Konovalova, V.S. AU Kasiyanenko, N.S. PY 2021 IS 6 PB Belgorod State Technological University named after V.G. Shukhov