Improving properties of portland cement using new types of composite additives M.I. Iskandarova, F.B. Atabaev, Z.B. Yakubzhanova, G.B. Begjanova, N.A. Mironyuk and D.U. Axmedova E3S Web of Conf., 365 (2023) 02013 Published online: 30 January 2023 DOI: 10.1051/e3sconf/202336502013