1. Dept. of Civil and Environmental Engineering, Michigan Technological Univ., Houghton, MI 49931; School of Civil Engineering, Universiti Sains Malaysia, Engineering Campus, 14300 Nibong Tebal, Pulau Pinang, Malaysia.
2. Dept. of Civil and Environmental Engineering, Michigan Technological Univ., Houghton, MI 49931.
3. Universal Pave Sdn Bhd, Unit 11, Level 8, The CEO, 31 Lebuh Nipah 5, 11900 Bayan Lepas, Pulau Pinang, Malaysia.