Computational investigation of capillary absorption in concrete using a three-dimensional mesoscale approach
作者： S Dehghanpoor Abyaneh , HS Wong , NR Buenfeld , None
DOI: 10.1016/J.COMMATSCI.2014.01.058
关键词:
摘要: Abstract In many exposure environments, capillary absorption of water controls the rate deterioration concrete. This paper presents a three-dimensional numerical investigation by treating concrete as heterogeneous composite discretised into cubic lattice. The lattice elements were considered conductive “pipes” with transport properties assigned based on phase they represent. process was described non-linear diffusion equation, hydraulic diffusivity function degree saturation composite. A finite element method used to solve the governing differential equations. results validated against analytical approximations, well experimental data from literature. sensitivity analysis then performed evaluate effect heterogeneities produced aggregate particles absorbed profile and sorptivity coefficient. It found that penetrates in an uneven influenced amount, spatial distribution shape particles. Sorptivity decreased when spherical replaced ellipsoidal due consequent increase tortuosity cement paste. increased aspect ratio volume fraction aggregate. However, size particle appears have insignificant influence.
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