In this study, the tensile strength, failure mechanism and ductile behavior of geo-grid reinforced high strength self-compacting concrete discs subjected to botch of the Brazilian tensile strength test and Biaxial compressive test are studied. To determine the combined effects of geo-grid layer numbers and inclination angle on the ultimate tensile strength of concrete samples, 21 experiments were conducted with up to three layers of geo-grids inclined at angles of 0° to 90° at increments of 15°. In addition to these experiments, discrete element numerical simulations were carried out using two-dimensional particle flow code to examine the failure behavior of geo-grid reinforced high strength self-compacting concrete discs. The numerical models were first calibrated by the experimental results and then the failure behavior of models containing geo-grids were investigated. Both experimental and numerical results demonstrated that augmenting the concrete discs with geo-grids increased the ductility of specimens specially after failure. As the number of geo-grid layers increased, the tensile strength of specimens also increased. Whereas the tensile strength and absorbed energy were the same for specimens with different number of geo-grid layers and inclination angles of 75° and 90°. The specimen with three horizontal geo-grid layers had the highest tensile strength, Biaxial compression strength and ductility among all tested specimens.
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