1. Research Assistant, Dept. of Materials, Faculty of Civil Engineering, Univ. of Zagreb, HR-10000 Zagreb, Croatia (corresponding author).
2. Master Student, Dept. of Materials, Faculty of Civil Engineering, Univ. of Zagreb, HR-10000 Zagreb, Croatia.
3. Full Professor, Dept. of Materials, Faculty of Civil Engineering, Univ. of Zagreb, HR-10000 Zagreb, Croatia.