Influence of bed ash on the rheology and properties of gypsum building mixtures Yousri Sweity, Victoria Petropavlovskaya, Tatiana Novichenkova and Kirill Petropavlovskii E3S Web Conf., 403 (2023) 03012 Published online: 25 July 2023 DOI: 10.1051/e3sconf/202340303012