1. PhD Civil Engineer, Assistant Professor, Dept. of Concrete Technology, EPS Univ. of Burgos, Calle Villadiego s/n, 09001 Burgos, Spain. E-mail: jmmanso@ubu.es
2. PhD Civil Engineer, Professor, Dept. of Materials Science, ETSIB Univ. of Basque Country, Alameda de Urquijo s/n, 48013 Bilbao, Spain. E-mail: iiplalam@bi.ehu.es
3. PhD Civil Engineer, Assistant Professor, Dept. of Materials Science, ETSICCP Univ. of Cantabria, Avda. de los Castros s/n, 39005 Santander, Spain. E-mail: polancoa@unican.es