1. Dept Mechanics of Materials and Constructions, Vrije Universiteit Brussel, Brussels, Belgium
2. Civil Engineering Department, Building Materials and Building Technology division, KU Leuven, Leuven, Belgium
3. Dept. of Materials Engineering, KU Leuven, Leuven, Belgium
4. Dept. Mechanics of Materials and Constructions, Vrije Universiteit Brussel, Brussels, Belgium