The use of technogenic carbon in gypsum compositions for green building Kirill Petropavlovskii, Ekaterina Ratkevich, Tat’yana Novichenkova and Viktoriya Petropavlovskaya E3S Web Conf., 403 (2023) 03013 Published online: 25 July 2023 DOI: 10.1051/e3sconf/202340303013