Two-dimensional X-ray CT image based meso-scale fracture modelling of concrete

W. Ren, Zhenjun Yang, R. Sharma, C. Zhang, P. J. Withers

Research output: Contribution to journalArticle

137 Citations (Scopus)
121 Downloads (Pure)

Abstract

Two-dimensional meso-scale finite element models with realistic aggregates, cement paste and voids of concrete are developed using microscale X-ray Computed Tomography images. Cohesive elements with traction–separation laws are pre-embedded within cement paste and aggregate–cement interfaces to simulate complex nonlinear fracture. Tension tests using a large number of images were simulated with statistical analysis. The very different load-carrying capacities and crack patterns demonstrate the effects of random distribution of phases. It is found that the tensile strength decreases as the void fraction increases, and the relative strength of cement paste and interfaces dominates the microcracking behaviour, which in turn affects macrocracking and load-carrying capacity.
Original languageEnglish
Pages (from-to)24-39
JournalEngineering Fracture Mechanics
Volume133
Early online date16 Oct 2014
DOIs
Publication statusPublished - Jan 2015
Externally publishedYes

Bibliographical note

Open Access funded by Engineering and Physical Sciences Research Council
Under a Creative Commons license

Keywords

  • Concrete
  • X-ray Computed Tomography
  • Image based modelling
  • Meso-scale finite element model
  • Cohesive crack model

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