1. Research Group Schoonmeersen, Department of Structural Engineering, Faculty of Engineering and Architecture, Ghent University Valentin Vaerwyckweg 1, B-9000, Ghent, Belgium.
2. CEITEC IPM, Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Žižkova 22, Brno 616 62, Czech Republic.
3. Institute of Physics of Materials, Academy of Sciences of the Czech Republic, Žižkova 22, 616 62 Brno, Czech Republic.
4. Magnel Laboratory for Concrete Research, Department of Structural Engineering, Faculty of Engineering and Architecture, Ghent University, Technologiepark-Zwijnaarde 904, B-9052, Ghent, Belgium.