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Pore-scale Modelling of Transport Properties in Cementitious Materials Using Lattice Boltzmann Method

Zhang, M; (2018) Pore-scale Modelling of Transport Properties in Cementitious Materials Using Lattice Boltzmann Method. In: Proceedings of the CONMOD2018 International Symposium on Concrete Modelling. RILEM: Delft, the Netherlands. (In press). Green open access

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Abstract

Transport properties (e.g. permeability and diffusivity) of cementitious materials are usually considered as the main indicators for durability assessment and service life prediction of reinforced concrete structures. In practice, concrete is rarely saturated. Therefore, it is not only of scientific interest but of practical importance to investigate transport properties in unsaturated cementitious materials. This paper presents an integrated modelling scheme to estimate transport properties of cementitious materials with various saturation levels based on their microstructures, which are obtained by X-ray computed microtomography and HYMOSTRUC3D respectively. An in-house code based on single-phase and multiphase lattice Boltzmann models is developed and used to simulate the moisture distribution, permeability and ionic diffusivity of hydrating cement paste. Afterwards, the effects of moisture content and microstructure of cement paste on permeability and ionic diffusivity are investigated in a quantitative manner. The results indicate that the moisture distribution, permeability and ionic diffusivity in unsaturated cement pastes significantly depend on the 3D microstructure. The simulated results show a good agreement with experimental data implying that the proposed modelling scheme provides an effective tool to predict the transport properties in unsaturated cementitious materials.

Type: Proceedings paper
Title: Pore-scale Modelling of Transport Properties in Cementitious Materials Using Lattice Boltzmann Method
Event: CONMOD2018 International Symposium on Concrete Modelling
Dates: 26 August 2018 - 29 August 2018
Open access status: An open access version is available from UCL Discovery
Publisher version: https://www.rilemweek2018.org/
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10060590
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