Microstructure-based 3D modelling of diffusivity in sound and cracked cement paste

Hadi Mazaheripour, Rui Faria, Miguel Azenha, Guang Ye, Erik Schlangen

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

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Abstract

Exposing reinforced concrete (RC) structures to aggressive environmental conditions is one of the main reasons that may limit their service life. Diffusion of chloride ions through concrete cover is one of the most damaging environmental actions, since it may cause corrosion of steel reinforcement. Therefore, modelling this phenomenon allows supporting a better durability assessment of RC structures. In the present study, a modelling strategy considering a 3D cement paste microstructure, which is obtained using HYMOSTRUC3D software, is adopted to compute the diffusion process in saturated sound and cracked cement pastes. The diffusion process is calculated as a statistical result of random walkers (representing ionic species) through the porosity of the cement paste microstructure. The simulation is implemented using a random walk algorithm (RWA), which is compatible to be used in sound and cracked cement paste microstructures. Additionally, the proposed modelling strategy aims to establish a relation between the diffusion coefficient of cement paste and the level of tensile damage in the microstructure, which is obtained by considering the microcrack development in the cement paste. A lattice fracture model is employed to simulate the microcracks. The primary results of the proposed model are presented and discussed in the present paper.
Original languageEnglish
Title of host publicationProceedings of the Symposium on Concrete Modelling
Subtitle of host publicationCONMOD2018 27-30 August 2018 – Delft, Netherlands
EditorsErik Schlangen, Geert de Schutter, Branko Šavija, Hongzhi Zhang, Claudia Romero Rodriguez
PublisherRilem
Pages321-332
VolumePRO 127
ISBN (Electronic)978-2-35158-216-9
Publication statusPublished - 2018
EventSymposium on Concrete Modelling - Delft, Netherlands
Duration: 27 Aug 201830 Aug 2018

Publication series

NameRilem proceedings
PublisherRilem
NumberPRO 127

Conference

ConferenceSymposium on Concrete Modelling
Abbreviated titleCONMOD2018
CountryNetherlands
CityDelft
Period27/08/1830/08/18

Bibliographical note

Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.

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