A numerical model for capillary suction and chloride convection into concrete

Authors: Sanchez, ThomasConciatori, DavidSorelli, Luca
Abstract: A numerical approach based on finite elements and finite difference methods is suggested to simulate transport chloride into concrete or innovative ultra-high performance concrete. The theoretical model consists of coupled nonlinear partial differential equations based on Fick’s diffusion law and on cinematic equations as in mechanics. The first transport phenomenon is the ionic diffusion through the material porosity, and the second is the chloride driving by water movement through the same porosity. Second Fick’s law considers the mass conservation in absence of any chemical reactions contrary to cinematic equations for water movement. For this reason, a special algorithm permits to restore the mass conservation in the cinematic equations. The model hence considers the exposure to de-icing salts, the concrete permeability and its thickness and the microclimate conditions leading to water movement through the concrete cover of a structure. The results highlight that the chloride ion concentration in the concrete cover increases quickly when the structure is both exposed to de-icing salt and liquid water. The chloride ingress depends above all on the climatic condition and the amount of de-icing salt and the influence of the cover concrete permeability is less significant.
Document Type: Article dans une conférence
Issue Date: 5 September 2019
Open Access Date: Restricted access
Document version: AM
Permalink: http://hdl.handle.net/20.500.11794/69724
This document was published in: RILEM International conference Strategies for Sustainable Concrete Structures - SSCS 2019
Collection:Autres articles publiés

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