PoreLab lecture on “Modelling complex degradation processes in concrete structures across material scales”

Title : Modelling complex degradation processes in concrete structures across material scales

Speaker: Dr. Ravi A. Patel

Affiliation: Institute of building materials and material testing laboratory (IMB/MPA), Karlsruhe Institute of technology (KIT), Karlsruhe, Germany, formerly at Laboratory of waste management, Paul Scherrer Institute (PSI), Villgen Switzerland 5232

When: 28 October 2020 at 13:00, Oslo time

Where: online (see below)

Abstract:

Several physico-chemical processes such as chloride induced corrosion, calcium leaching, carbonation, sulphate attack, etc. lead to degradation of concrete structures. Physico-chemical processes initiates dissolution/precipitation processes within concrete at pore-scale which leads to significant changes in its pore structure and in turn affects its physical and mechanical properties.  Physics based models for prediction of extent of these degradation mechanisms will therefore require time dependent constitutive relations which would be very difficult to parametrize if not impossible for such complex Multiphysics processes. Therefore, a “bottom-up” modelling approach starting with modelling of these processes and upscaling these models to structural scale can be a “potential game changer”.  Such models would allow us to improve service life predictions, connect accelerated laboratory tests to field conditions and can act as a virtual laboratory which can be used to quickly optimize and test new mixes.

In this presentation I would provide an overview of my research activities focusing towards development of multiscale approaches for physico-chemical degradation processes in concrete structures. I start by introducing current models to describe pore-structure of concrete at different scales of cement system which serves as starting point for multi-scale model. Following this I introduce a lattice Boltzmann method-based Multiphysics modelling framework developed to capture physico-chemical processes at different scales in concrete. Finally, cases are presented to show current advances made in development of “bottom-up” modelling approaches for degradation processes of concrete structures.

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