Improving the strength and resistance of cement composites to the external environment by utilizing complex additivesAnatoly Fedortsov, Vladislav Fedortsov, M.V. Ashchepkov, K.V. Rusakov, Sergey Gladkin and Vladimir ErofeevE3S Web Conf., 281 (2021) 03014DOI: https://doi.org/10.1051/e3sconf/202128103014