MICROMECHANICAL PROPERTIES OF DIFFERENT MATERIALS ON GYPSUM BASIS

P. Tesarek, T. Plachy, P. Ryparova, and J. Nemecek (Czech Technical University in Prague, Faculty of Civil Engineering): Micromechanical Properties of Different Materials on Gypsum Basis Micro- and macro-level elastic properties of three types of gypsum samples (dental gypsum, flue gas desulphurization gypsum and grey gypsum) were compared. Grid nanoindentation, statistical deconvolution and porosimetry were used on lower composite level and non-destructive impulse method on macro-scale. The transition between the scales was computationally maintained by the Mori-Tanaka homogenization method. Good agreement was achieved between experiments and numerical prediction. Obtained results also showed that the micro-elastic properties predicted ( by inverse analysis) for FGD and grey gypsum samples (beta-gypsum composition) are approximately 2.6-2.8x lower then those for dental gypsum (alpha-gypsum composition).