1. Assistant Professor, Dept. of Materials, Univ. of Zagreb, Faculty of Civil Engineering, Fra Andrije Kacica Miosica 26, 10000 Zagreb, Croatia (corresponding author).
2. Professor Emerita, Dept. of Materials, Univ. of Zagreb, Faculty of Civil Engineering, Fra Andrije Kacica Miosica 26, 10000 Zagreb, Croatia.
3. Professor, Dept. of Materials, Univ. of Zagreb, Faculty of Civil Engineering, Fra Andrije Kacica Miosica 26, 10000 Zagreb, Croatia.