Hawa, Abideng. “Strength and Microstructural of Geopolymer Mortar from Palm Oil Ash Containing Alumina Powder With Palm Oil Clinker Aggregate”. Engineering and Applied Science Research 49, no. 6 (October 31, 2022): 731–743. Accessed May 2, 2024. https://ph01.tci-thaijo.org/index.php/easr/article/view/249237.