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Valorization of basic oxygen furnace slag in civil engineering materials

These abundant steel byproducts (~2 500 000 tons/year in France) contain some Portland clinker phases that give them a latent hydraulic capacity. But they also contain free lime scattered within the materials which causes the degradation of grains and expansion of the mixtures when it becomes hydrated. Two ways of valorization have been studied:

a) as aggregates in mixture devoted to road sub-base layers. To design mixtures, a complete parametric model was developed on the basis of tests carried out with a variety of products. It allows to find the optimized amount of slag that can be blended in a granular mixture for an expansion tolerated within a given time, as a function especially of the free lime content of the products

b) as a constituent of hydraulic road binders. After fine grinding, the mixture of this product with clinker, blast furnace slag, fly ashes of thermal power plant, admixtures, etc gives high performance road binders, at least for use in soils treatment.

<font size="1"><i>Analyse microsonde de la composition minéralogique de laitiers d’aciérie</font></i>

Numerical and analytical method for structural analysis

<font size="1"><i>Displacement time history (ref Engineering Analysis with Boundary Elements 2009)</font></i>

Development of mathematical and numerical models quite founded from the point of view of the theoretical mechanics of the various behaviors (critical loads and buckling)

Development of a new numerical method entitled “Meshless Local Petrov- Galerkin (MLPG) combined with the Finite Volumes Method (FVM)” applied to the structural analysis. It is based on the resolution of the weak form of the partial differential equations by a method of Petrov Galerkin as in finite elements, but the approximation of the field of displacement introduced into the weak form does not require mesh.

New approach "Orthogonal Meshless Finite Method Volume" developed in collaboration with South Dakota State University.