Coupling of Mechanics and Transport in Discrete Meso-level Model: Verification

Coupling of Mechanics and Transport in Discrete Meso-level Model: Verification

Stať ve sborníku mimo WoS a Scopus

Cracking in concrete has a paramount impact on the durability of structures. The natural permeability of a healthy material is severely magnified in the presence of cracks. Cracks form a network of channels capable to transport a fluid that may chemically or physically interact with concrete constituents or the reinforcing steel, leading to deterioration of structural members or entire structures. Moreover, the presence of a pressurized fluid in cracks and pores leads to further crack development and therefore also to further increase in permeability. In order to predict the behavior of fractured quasibrittle solids filled with a pressurized fluid, a robust mechanical model is needed to describe the crack widths, connectivity, tortuosity, spacing, etc. The mechanical model must be fully coupled with a transport model into a multiphysical solver. We present such a solver, and validate it by comparison with experimental data from literature. The model is discrete, allowing to easily embody cracks and the coupling mechanisms. Individual discrete units represent mineral aggregates while the inter-particle contacts account for matrix between them.

Cracking in concrete has a paramount impact on the durability of structures. The natural permeability of a healthy material is severely magnified in the presence of cracks. Cracks form a network of channels capable to transport a fluid that may chemically or physically interact with concrete constituents or the reinforcing steel, leading to deterioration of structural members or entire structures. Moreover, the presence of a pressurized fluid in cracks and pores leads to further crack development and therefore also to further increase in permeability. In order to predict the behavior of fractured quasibrittle solids filled with a pressurized fluid, a robust mechanical model is needed to describe the crack widths, connectivity, tortuosity, spacing, etc. The mechanical model must be fully coupled with a transport model into a multiphysical solver. We present such a solver, and validate it by comparison with experimental data from literature. The model is discrete, allowing to easily embody cracks and the coupling mechanisms. Individual discrete units represent mineral aggregates while the inter-particle contacts account for matrix between them.

Brazilian disc; concrete; coupled model; cracking; discrete model; mass transport

Brazilian disc; concrete; coupled model; cracking; discrete model; mass transport

MAŠEK, J.; ELIÁŠ, J.

01.01.2021

CIMNE

16th edition of the International Conference on Computational Plasticity

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