{"id":13,"date":"2019-01-23T15:24:12","date_gmt":"2019-01-23T14:24:12","guid":{"rendered":"https:\/\/www.mines-stetienne.fr\/spin-en\/?page_id=13"},"modified":"2019-02-19T13:29:14","modified_gmt":"2019-02-19T12:29:14","slug":"powder-handling","status":"publish","type":"page","link":"https:\/\/www.mines-stetienne.fr\/spin\/areas-of-expertise\/powder-handling\/","title":{"rendered":"Powder handling"},"content":{"rendered":"

Our goal is to bridge macroscopic features such as flowability, reaction extent, … with the properties of individual particles (size, shape, chemical composition, …) and the suspending medium (flow regime, temperature, pressure, composition, …). This approach is applied to powders and grains in a gas as well as to concentrated pastes such as cement and concrete.<\/p>\n\n\n\n\n
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Powders and Grains<\/a><\/td>\n<\/td>\nCement and concrete<\/a><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

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Powders and grains<\/h3>\n\n\n\n\n\n\n\n
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Experiments<\/h4>\n

Our experimental activities concentrate on characterizing granular materials (chemistry, geometrical\/physical structure, …), developing new instruments (flowability, cohesion forces, …) or measurement techniques (acoustic emission, …) and synthesizing\/transforming powders and grains (atomization, mixing, grinding, compression, vibrations, …) <\/td>\n<\/tr>\n

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Modeling<\/h4>\n

We aim at developing models to simplify the complex reality and, especially, to derive physically-based laws that can reproduce the macroscopic behavior of granular material in an industrial scale. An academic position is now open on this topic to strengthen our capacity.<\/td>\n<\/tr>\n

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Numerical simulation<\/h4>\n

In order to gain in understanding, avoid costly or dangerous experiments, optimize a process, we are using and improving different numerical methods. In particular, we focus on methods well suited to describe granular materials and their interaction with a fluid : Discrete Element Method (DEM), Smoothed Particles Hydrodynamics (SPH), Lattice Boltzmann Method (LBM) and Two-Phase models (TFM).<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Cement and concrete<\/h3>\n\n\n\n\n\n
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Organic-mineral interactions<\/h4>\n

We study the synergic and competitive mechanisms of interaction between organic adjuvants and cementitious materials. Based on a deep knowledge of the physico-chemistry of hydraulic\/calcic\/ceramic binders and wood\/polysaccharides, we explore the rheological properties of fresh cement as well as the hydration and setting phenomena. For that, we make profit of our extensive characterization facilities (rheology, setting time, physico-chemistry, thermal analysis, …)<\/td>\n<\/tr>\n

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Micro-organisms and cementitious materials<\/h4>\n

For economic and aesthetic reasons, it is of importance to investigate how cementitious materials react towards a biological colonisation (algae, mushrooms). Comparing the experimental data from in-situ and lab benches, we evaluate the influence of physical and chemical parameters on the substrate bio-receptivity.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Group members<\/h3>\n