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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.
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.
Pore-scale Modelling of Transport Properties in Cementitious Materials Using Lattice Boltzmann Method
Zhang, M (author)
2018-08-26
In: Proceedings of the CONMOD2018 International Symposium on Concrete Modelling. RILEM: Delft, the Netherlands. (2018) (In press).
Paper
Electronic Resource
English
DDC:
690
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