1. Faculty of Civil Engineering & Technology, Universiti Malaysia Perlis, Arau 02600, Perlis, Malaysia
2. Sustainable Environment Research Group (SERG), Centre of Excellence Geopolymer and Green Technology (CEGeoGTech), Universiti Malaysia Perlis, Arau 02600, Perlis, Malaysia
3. School of Distance Education, Universiti Sains Malaysia, Gelugor 11800, Penang, Malaysia
4. School of Civil Engineering, Engineering Campus, Universiti Sains Malaysia, Nibong Tebal 14300, Penang, Malaysia
5. Faculty of Computer and Mathematical Sciences, Universiti Teknologi Mara (UiTM), Shah Alam 40450, Selangor, Malaysia
6. National Institute for Research and Development in Environmental Protection (INCDPM), Splaiul Independentei 294, 060031 Bucharest, Romania