Effets de défauts de coulage sur la micro-fissuration des dalles minces en béton fibré à ultrahaute performance - étude par stéréovision et corrélation d'images digitales
|Advisor:||Sorelli, Luca; Fafard, Mario|
|Abstract:||Ultra-high performance fiber reinforced concrete (UHPFRC) is well known for its great compressive resistance and its ductility. Furthermore, it is also well known that UHPFRC strongly depends on fibers’ orientations relatively to the direction of stresses. However, little is documented in the literature about the impact of local fiber discontinuity caused by casting defect. In this MSc thesis, a laboratory protocol is developed in order to measure the impact of the presence of defects in a UHPFRC slab on the mechanical response. This protocol is based on a system of photogrammetric measurement by digital image correlation (DIC). This technique allows the precise measure of the deformation as well as the displacement with help of a pair of high resolution digital camera. A computer-based post treatment analysis of these pictures is used to create a 3D model of the observed sample surface. With this new analysis method, it is possible to present different aspect of the non-linear behavior of this material. During this project, 6 different geometries of slab with and without casting defect were submitted to flexional stress by punctual loading. By developing a laboratory protocol adapted to this project, digital image correlation analysis gave a multitude of very precise results. A specific attention is made to the impact of the defect on the global mechanical behavior as well as the local damaging caused by the micro-cracks.|
|Document Type:||Mémoire de maîtrise|
|Open Access Date:||7 May 2018|
|Collection:||Thèses et mémoires|
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