Change in the strength properties of modified concrete over time Bakhridin Khasanov, Nikolai Vatin, Ruzimurat Choriev, S Akhmedov, Shokhida Nazarova and Timur Mirzaev E3S Web of Conf., 365 (2023) 02017 Published online: 30 January 2023 DOI: 10.1051/e3sconf/202336502017