TY JOUR TI NEW INDICATOR METHOD FOR DETERMINING CARBONIZATION ZONES IN CONCRETE AND REINFORCED CONCRETE STRUCTURES KW concrete KW reinforced concrete KW corrosion KW carbonization KW neutralization KW leaching KW examination KW phenolphthalein test KW universal indicator JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Goglev, I.N. AU Loginova, S.A. PY 2022 IS 7 PB Belgorod State Technological University named after V.G. Shukhov