1. Research Fellow, Dept. of Construction Engineering, Univ. of Quebec, École de Technologie Supérieure, 1100 Notre-Dame West St., Montreal PQ, Canada H3C 1K3.
2. Professor, Dept. of Construction Engineering, Univ. of Quebec, École de Technologie Supérieure, 1100 Notre-Dame West Street, Montreal PQ, Canada H3C 1K3 (corresponding author).