Macroscopic diffusivity in concrete determined by computational homogenization. (31st May 2012)

• Record Type: Journal Article
• Authors: Nilenius, Filip; Larsson, Fredrik; Lundgren, Karin; Runesson, Kenneth
• Is Part Of: International journal for numerical and analytical methods in geomechanics. Volume 37:Number 11(2013)
• Page Start: 1535
• Page End: 1551
• Publication Date: 2012-05-31
• Subjects: computational homogenization -- mesoscale -- diffusion -- ballast -- ITZ; Soil mechanics -- Mathematics -- Periodicals; Rock mechanics -- Mathematics -- Periodicals; 624.1510151
• DOI: 10.1002/nag.2097
• Languages: English
• ISSNs: 0363-9061

Abstract

SUMMARY: Effective moisture and chloride ion diffusivity coefficients for concrete are determined by computational homogenization, where concrete is modeled on the mesoscale as a heterogenous three‐phase composite material. By imposing moisture and chloride ion gradients on a representative volume element, effective macroscale properties are obtained through finite element analysis. A parametric study of the effects of the ballast content was carried out. The numerical results correspond well with an estimate of the Hashin–Shtrikman type available in the literature. The computational homogenization strategy proposed here also includes the interfacial transition zone, and its influence on the effective diffusivity coefficients is assessed. Copyright © 2012 John Wiley & Sons, Ltd.