1. Universiti Tun Hussein Onn Malaysia, Faculty of Engineering Technology, 84600 Panchor, Johor, Malaysia
2. Universiti Malaysia Perlis (UniMAP), Centre of Excellence Geopolymer & Green Technology (CEGeoGTech), 01000 Perlis, Malaysia
3. Częstochowa University of Technology, Faculty of Production Engineering and Materials Technology, Department of Physics, 19 Armii Krajowej Av., 42-200 Częstochowa, Poland