A meso-scale model toward concrete water permeability regarding aggregate permeability

Minfei Liang, Kun Feng, Chuan He, Yuqiang Li, Lin An, Wenqi Guo

Research output: Contribution to journalArticleScientificpeer-review

Abstract

The permeability of natural aggregate is close to cement mortar with relative lower w/c ratios, therefore when calculating the overall concrete water permeability, the effect of aggregate permeability cannot be neglected. This paper presents a sophisticated 3D three phase meso-scale model based on an efficient method of generating random ellipsoidal particles within confined cylindrical space. The meso-scale model considers concrete as the combination of mortar, aggregate and interfacial transition zone, and is used to characterize the permeability of concrete. Furthermore, a series of permeation experiments of concrete with different w/c ratios and aggregate volume fractions are conducted to exemplify the effects of aggregates on concrete water permeability and provide parameters and verification for numerical models. The effects of aggregate permeability on concrete water permeability is evaluated based on both experimental and numerical results. And the permeability coefficient of aggregate adopted in the experiment is estimated reasonably and incorporated into further numerical predictions of concrete water permeability. By comparing the experimental and numerical results, the applicability of meso-scale model proposed here is validated and the effects of aggregate on water permeability of concrete with different w/c ratios vary from each other, depending on the ratio of water permeability of aggregate and mortar.

Original languageEnglish
Article number120547
Pages (from-to)1-15
Number of pages15
JournalConstruction and Building Materials
Volume261
DOIs
Publication statusPublished - 2020

Keywords

  • Aggregate
  • Concrete water permeability
  • Meso-scale model
  • Numerical simulation
  • Permeation experiment

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