“EXPERIMENTAL INVESTIGATION OF THE STRENGTH PROPERTIES OF CONCRETE PRODUCED WITH VOLCANIC ASH AND METAKAOLIN AS PARTIAL REPLACEMENT OF CEMENT”. FUDMA JOURNAL OF SCIENCES 9, no. 6 (June 30, 2025): 90–97. Accessed September 11, 2025. http://www.fjsadmin.fudutsinma.edu.ng/index.php/fjs/article/view/3545.