Attah IC, Okafor FO, Ugwu OO. Experimental and optimization study of unconfined compressive strength of ameliorated tropical black clay. Eng Appl Sci Res [internet]. 2021 May 14 [cited 2026 Sep. 13];48(3):238-4. available from: https://ph01.tci-thaijo.org/index.php/easr/article/view/241469