Torkittikul, P., Kaosomboon, T., Makararotrit, W., Malai, S. and Sripuman, A. 2022. THE PRELIMINARY INVESTIGATION OF USING WASTE PLASTER GYPSUM MOLD AS SAND REPLACEMENT MATERIAL IN MORTAR. PSRU Journal of Science and Technology. 7, 2 (Aug. 2022), 1–13.