Production of mortar with calcined alum sludge as partial cement replacementAi Wei Wong, Hoong Yuin Chew, Mohammed J. K. Bashir, Majed A. A. Aldahdooh and Choon Aun NgE3S Web Conf., 603 (2025) 02008DOI: https://doi.org/10.1051/e3sconf/202560302008