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.