Repair compositions for restoration of operated reinforced concrete structures Elena Shlyakhova, Irina Serebryanaya, Inna Egorochkina, Andrey Matrosov, Maxim Odinets and Michael Knyazhichenko E3S Web Conf., 273 (2021) 04017 Published online: 22 June 2021 DOI: 10.1051/e3sconf/202127304017