Flexural strength and fatigue properties of interfacial transition zone at the microscale

Yidong Gan, Hongzhi Zhang, Minfei Liang*, Yu Zhang, Erik Schlangen, Klaas van Breugel, Branko Šavija

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

20 Citations (Scopus)
89 Downloads (Pure)

Abstract

In this study, the flexural strength and fatigue properties of interfacial transition zone (ITZ) were experimentally investigated at the micrometre length scale. The hardened cement paste cantilevers (150 × 150 × 750 μm3) attached to a quartzite aggregate surface were prepared and tested under the monotonic and cyclic load using a nanoindenter. The measured flexural strength of the ITZ (10.49–14.15 MPa) is found to be one order of magnitude higher than the macroscopic strength of ITZ reported in literature. On the other hand, the fatigue strength of the ITZ is lower than that of bulk cement paste at same length scale, measured previously by the authors. The microscopic mechanical interlocking and the electrostatic interaction between aggregate surface and hydration products are thought to contribute to the bond strength of ITZ. This study provides an experimental basis for the development of multiscale analysis of concrete subjected to both static and fatigue loading.

Original languageEnglish
Article number104717
JournalCement and Concrete Composites
Volume133
DOIs
Publication statusPublished - 2022

Keywords

  • Fatigue
  • Flexural strength
  • Interfacial transition zone
  • Microscale testing

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