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Mesoscale modelling of crack-induced diffusivity in concrete

Filip Nilenius (Institutionen för bygg- och miljöteknik, Konstruktionsteknik) ; Fredrik Larsson (Institutionen för tillämpad mekanik, Material- och beräkningsmekanik) ; Karin Lundgren (Institutionen för bygg- och miljöteknik, Konstruktionsteknik) ; Kenneth Runesson (Institutionen för tillämpad mekanik, Material- och beräkningsmekanik)
Computational Mechanics (0178-7675). Vol. 55 (2015), 2, p. 359-370.
[Artikel, refereegranskad vetenskaplig]

Cracks have large impact on the diffusivity of concrete since they provide low-resistance pathways for moisture and chloride ions to migrate through the material. In this work, crack-induced diffusivity in concrete is modelled on the heterogeneous mesoscale and computationally homogenized to obtain macroscale diffusivity properties. Computations are carried out using the finite element method (FEM) on three-dimensional Statistical Volume Elements (SVEs) comprising the mesoscale constituents in terms of cement paste, aggregates and the Interfacial Transition Zone (ITZ). The SVEs are subjected to uni-axial tension loading and cracks are simulated by use of an isotropic damage model. In a damaged finite element, the crack plane is assumed to be perpendicular to the largest principle strain, and diffusivity properties are assigned to the element only in the in-plane direction of the crack by anisotropic constitutive modelling. The numerical results show that the macroscale diffusivity of concrete can be correlated to the applied mechanical straining of the SVE and that the macroscale diffusivity increases mainly in the transversal direction relative to the axis of imposed mechanical straining.

Nyckelord: computational homogenization, mesoscale, statistical volume element, cracks, chlorides



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Denna post skapades 2015-01-09. Senast ändrad 2015-06-12.
CPL Pubid: 210361

 

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