Determination of fracture energy of early age concrete through a uniaxial tensile test on an un-notched specimen

Dongya Ren, Lambert Houben

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Unlike the notched specimens for conventional concrete fracture tests, this paper introduces a deformation-controlled uniaxial tensile test on an un-notched specimen. The surface of the dog bone-shaped specimen is a second order parabolic curve, and the gradual change in the specimen shape does not lead to extreme stress concentrations. Another significant feature of the tension test set-up is that it is built with three hinges, to accommodate the alignment of the specimens. The specimen preparation, test conditions, and the tension test set-up are explained in detail. The fracture energy of the concrete is determined by the obtained complete softening curves. The fracture energy is found to increase with age, going towards a horizontal asymptote as concrete hardened in a tested age range of 1 day to 90 days. Moreover, the rate of development of the fracture energy was found to be higher when compared to tensile strength and stiffness.

Original languageEnglish
Article number496
Pages (from-to)1-15
Number of pages15
JournalMaterials
Volume13
Issue number3
DOIs
Publication statusPublished - 2020

Keywords

  • Early age concrete
  • Fracture energy
  • Un-notched specimen
  • Uniaxial tensile test

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