Effect of specimen size on fracture energy and softening curve of concrete: Part I. Experiments and fracture energy

Zhifang Zhao, Seung Hee Kwon*, Surendra P. Shah

*Corresponding author for this work

Research output: Contribution to journalArticle

90 Scopus citations

Abstract

The fracture energy of concrete GF is a fundamental fracture parameter, presenting the concrete's cracking resistance. However, because of the experimentally observed size dependency, it remains controversial as to whether the fracture energy can be considered as a material property. In this study, a three-point bend test for a notched beam and a wedge splitting test were performed with different size specimens for ten different concrete mixes in order to investigate the effect of specimen size and geometry on the fracture energy. A data processing method was proposed for averaging the test results of companion specimens, and the fracture energy was calculated from the averaged results. From a comparison of the fracture energies, it was found that the fracture energy increases with an increase in specimen size in both the beam and wedge splitting tests.

Original languageEnglish (US)
Pages (from-to)1049-1060
Number of pages12
JournalCement and Concrete Research
Volume38
Issue number8-9
DOIs
StatePublished - Aug 1 2008

Keywords

  • Fracture energy
  • Size effect
  • Three-point bend test
  • Wedge splitting test

ASJC Scopus subject areas

  • Building and Construction
  • Materials Science(all)

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