1. Senior Lecturer, Faculty of Civil Engineering, Univ. Teknologi Malaysia, 81310 Skudai, Johor Bahru, Malaysia (corresponding author).
2. Professor, Faculty of Civil Engineering, Univ. Teknologi Malaysia, 81310 Skudai, Johor Bahru, Malaysia.
3. Senior Lecturer, Faculty of Civil Engineering, Univ. Teknologi Malaysia, 81310 Skudai, Johor Bahru, Malaysia.
4. Senior Lecturer, Faculty of Chemical Engineering and Natural Resources, Univ. Teknologi Malaysia, 81310 Skudai, Johor Bahru, Malaysia.