1. Department of Textile, Ghent Univ., 9052 Ghent, BE (Corresponding author), e-mail: benny.malengier@ugent.be
2. Laboratory of Geotechnics, Ghent Univ., 9052 Ghent, BE, e-mail: gemmina.diemidio@ugent.be
3. Laboratory of Geotechnics, Ghent Univ., 9052 Ghent, BE, e-mail: herman.peiffer@ugent.be
4. Department of Industrial System and Product Design, Ghent Univ., Campus Kortrijk, G. K. De Goedelaan 5, 8500 Kortrijk, BE, e-mail: Cristina.Ciocci@UGent.be
5. Faculty of Mathematics, Physics and Informatics, Comenius Univ. Bratislava, Mlynská dolina, 84248 Bratislava, SK, e-mail: pavol.kison@gmail.com