1. CNRS, Univ. Bordeaux, ICMCB, UPR 9048; F-33600 Pessac France
2. Sustainable Construction Division; Tecnalia Parque tecnológico de Bizkaia; C/Geldo, Edif. 700 48160 Derio Spain
3. UPV-EHU; Dep. Mining-Metallurgy Engeneering and Mat. Science; Alameda Urquijo s/n 48013 Bilbao Spain