1. Associate Professor, Politecnico di Torino, Dept. of Hydraulics, Transportation and Civil Infrastructures. 24, corso Duca degli Abruzzi, Torino, Italy 10129.
2. Politecnico di Torino, Dept. of Hydraulics, Transportation and Civil Infrastructures. 24, corso Duca degli Abruzzi, Torino, Italy 10129 (corresponding author).
3. Researcher, Buzzi Unicem S.p.A. 6, via L. Buzzi, Casale Monferrato, Italy, 15033.