Yeunyongkul, P. , Prakunanan, M. , Sakjaroenchaikul, K. , Promdan, S. , Krudtong, S. , Munsin, R. , Jarupoom, P. , Siripornakarachai , S. and Khamdaeng, T. 2021. Investigation of Properties of Powder Coating Sludge-Indian kaolin Based Geopolymer. RMUTL Engineering Journal. 6, 2 (Dec. 2021), 11–18. DOI:https://doi.org/10.14456/rmutlengj.2021.7.