1. Siam Research and Innovation, Siam Cement Group-Cement and Building Material, 51 Moo 8 Tubkwang, Saraburi, Kaeng Khoi 18260, Thailand; Faculty of Engineering, Bangkokthonburi Univ., Bangkok 10170, Thailand (corresponding author).
2. Professor, School of Civil and Construction Engineering, College of Engineering, Oregon State Univ., Corvallis, OR 97331.