TY JOUR TI MODIFICATION OF CONCRETE FROM GROUTING CEMENT WITH ADDITIVES BASED ON LECITHIN EXTRACTION WASTE KW grouting cement KW additives KW lecithin KW waste JO Bulletin of Belgorod State Technological University named after. V. G. Shukhov AU Kharlamov, V.A. AU Lopanov, A.N. AU Dement'ev, K.V. AU Sysoev, P.I. PY 2024 IS 9 PB Belgorod State Technological University named after V.G. Shukhov