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The first research direction is dedicated to the understanding of the interactions between hydraulic binders (lime and cements) with natural materials (soils) and minerals (clays) in civil ingeneering applications to reuse local soil in earth work projects or include new natural additives in cements. The aim is to deconvolve the physico-chemical mechanisms that occur at the atomic level (solid NMR, XAS, TEM) and lead to the modification of the macroscopic properties through analyses at the particle scale (microstructure study, XRD, SEM). These physico-chemical analyses are conducted in relation with geotechnical characterizations in order to relate mechanisms initiated at the level of exchange sites at the phyllosilicates particles surface (clay minerals, micas) to macroscopic mechanical phenomena in the soil.

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The engineering of construction materials for roads and the subsequent use of road infrastructures are responsible for metallic pollutant dispersion (Zn, Cu, Ni, platinoids...) in the surrounding of environmental soils. The evaluation of their environmental impact environnemental requires the knowledge of the distribution and mobility of these elements. In this context, local analyses techniques such as transmission electron microscopy techniques (images, chemical analyses) are used to first detect these elements present in very low concentration, and then to determine their distribution, their speciation and the nature of the bearing phases.