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(1) Presentation(s)


Jeu. 07/07/2022 14:00 Salle 205, Bâtiment 2, Etage 1 (à confirmer)

SOBOLEV Konstantin (Department of Civil & Environmental Engineering and Department of Materials Science, University of Winsconsin-Milwaukee)
Concrete under Nanoscope


Concrete, the most ubiquitous material, is a nano-structured, multi-phase, composite material that ages over time. It is composed of an amorphous phase, nanometer to micrometer size crystals, bound water, and wide range of porosity. The properties of concrete exist in, and the degradation mechanisms occur across, multiple length scales (nano to micro to macro) where the properties of each scale derive from those of the next smaller scale. The amorphous phase, calcium-silicate-hydrate (C–S–H) is the “glue” that holds concrete together and is itself a nanomaterial. Viewed from the bottom up, at the nanoscale concrete is a composite of molecular assemblages, surfaces (aggregates, fibers), and chemical bonds that interact through local chemical reactions, intermolecular forces, and intraphase diffusion. There is strong evidence that the processes occurring at the nanoscale ultimately affect the engineering properties and performance of the bulk material.
Nanotechnology has changed our vision, expectations, and abilities to control the material world. These developments will greatly affect modern construction and the field of cement-based materials. Despite these developments, the nanotechnology is still in its pre-exploration stage; it is just emerging from fundamental research onto the industrial floor; thus, the full-scale applications in concrete are still limited. Yet, the tremendous potential of nanotechnology to improve the performance of concrete is most promising.

Main Directions:
Recognize the opportunities with new nano-engineered concrete.
Identify appropriate production methods and suitable applications for concrete with nanoparticles/nanofibers.
Compare the performance of nanoparticles/nanofibers in concrete.
Analyze the assumptions and common misconceptions related to nanotechnology of concrete.
Recognize the environmental issues related to application of nanomaterials in concrete

Pour plus d'informations, merci de contacter Gibier F.