Improvement of Pozzolanic Properties of Oil Palm Boiler Ash Through Heat TreatmentYu Xuan Liew, Siew Choo Chin, Hui Jun Goh, Siti Asmahani Saad and Jolius GimbunE3S Web Conf., 422 (2023) 01005DOI: https://doi.org/10.1051/e3sconf/202342201005