Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Multiscale modelling of ionic diffusivity in unsaturated concrete accounting for its hierarchical microstructure
This study presents an integrated multiscale framework for modelling ionic diffusivity in unsaturated concrete accounting for its microstructural features and 3D moisture distribution. The hierarchical microstructure of concrete at multiscale from nano- to meso-scale is mimicked, based on which the fluid-solid interaction and moisture distribution in pore network of concrete with various saturation levels are simulated using a lattice Boltzmann multiphase model. A lattice Boltzmann-finite difference model for diffusion is developed to mimic the ionic diffusion and predict the ionic diffusivity in unsaturated concrete. Results indicate that ionic diffusivity in unsaturated concrete highly depends on moisture content and distribution, pore structure, and aggregate content. As the water saturation level drops to around 90%, interfacial transition zone starts to retard ionic diffusion. Voids have a great contribution to water saturation level but less effect on ionic diffusivity. The simulation results of ionic diffusivity at each scale agree well with experimental data.
Multiscale modelling of ionic diffusivity in unsaturated concrete accounting for its hierarchical microstructure
This study presents an integrated multiscale framework for modelling ionic diffusivity in unsaturated concrete accounting for its microstructural features and 3D moisture distribution. The hierarchical microstructure of concrete at multiscale from nano- to meso-scale is mimicked, based on which the fluid-solid interaction and moisture distribution in pore network of concrete with various saturation levels are simulated using a lattice Boltzmann multiphase model. A lattice Boltzmann-finite difference model for diffusion is developed to mimic the ionic diffusion and predict the ionic diffusivity in unsaturated concrete. Results indicate that ionic diffusivity in unsaturated concrete highly depends on moisture content and distribution, pore structure, and aggregate content. As the water saturation level drops to around 90%, interfacial transition zone starts to retard ionic diffusion. Voids have a great contribution to water saturation level but less effect on ionic diffusivity. The simulation results of ionic diffusivity at each scale agree well with experimental data.
Multiscale modelling of ionic diffusivity in unsaturated concrete accounting for its hierarchical microstructure
Liu, Cheng (Autor:in) / Zhang, Mingzhong (Autor:in)
01.06.2022
Cement and Concrete Research , 156 , Article 106766. (2022)
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
DDC:
690
Multiscale Study of Ionic Diffusivity in Non-saturated Blended Concrete
| BASE | 2021
Multiscale Analytical-Numerical Theory of the Diffusivity of Concrete
| Online Contents | 1998
Multiscale Analytical/Numerical Theory of the Diffusivity of Concrete
| British Library Online Contents | 1998
Confluence of Chloride Diffusivity Influence Functions in Unsaturated Concrete
| British Library Conference Proceedings | 2008
Unsaturated diffusivity functions for concrete derived from NMR images
| Online Contents | 2003