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This project addresses the rheology of unsaturated granular materials, in a generic framework, using model materials. These model systems will first be slightly polydisperse assemblies of macroscopic spherical grains (with diameters between 0.1 and 1 mm), mixed with (mostly) non-volatile, wetting, Newtonian liquids. In a second step, we will study complex shaped grains, a wider polydispersity of grains, and non-Newtonian liquids. Thus, within a multi-scale approach, our goal is to establish the fundamentals of the capillary and/or viscous phenomena involved in these materials.
Controlling and evaluating concrete carbonation are key steps towards the construction of sustainable cement-based structure with low environmental impact. ENPC and LafargeHolcim R&D are inviting world leading experts to discuss the physics and chemistry at play during carbonation of concrete from various perspectives and using different methods. Invited scientists will share the latest development in their field. Discussions between guest lecturers and attendees will be fostered so the group can draw future research needs necessary to solve applied challenges regarding concrete carbonation.
In order to fully exploit the potential of nonlinear structures in engineering applications, we must not only develop appropriate design and analysis techniques, but also experimental methods to validate their performance. Existing experimental methods are limited in the structural response that can be measured, and cannot capture nonlinear phenomena such snapback, or follow unstable equilibrium branches. A quasi-static experimental path-following method has been developed, which expands our ability to experimentally measure unstable equilibria in nonlinear structures. This talk will introduce the theoretical background to the experimental path-following method, highlighting parallels with numerical continuation methods, and present recent experimental results for a shallow arch test case.
Retrouver le programme du séminaire MSROE 2019 !