Hawa A. Strength and microstructural of geopolymer mortar from palm oil ash containing alumina powder with palm oil clinker aggregate. Eng Appl Sci Res [Internet]. 2022 Oct. 31 [cited 2024 May 2];49(6):731-43. Available from: https://ph01.tci-thaijo.org/index.php/easr/article/view/249237