1. Professor, Ecole Polytechnique Fédérale de Lausanne, IS-BETON, bât. GC, Station 18, CH-1015 Lausanne, Switzerland.
2. Postdoctoral Fellow, Ecole Polytechnique Fédérale de Lausanne, IS-BETON, bât. GC, Station 18, CH-1015 Lausanne, Switzerland (corresponding author).