Experimental study on failure mechanism of modeled recycled aggregate concrete under uniaxial compression

Wengui Li*, Jianzhuang Xiao, Weijian Yi, Surendra P Shah

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

In this study, systematic experimental research was carried out to investigate the crack propagation of modeled recycledag gregate concrete (MRAC) under uniaxial compressive loading. A two-dimensional nondestructive digital image correlation (DIC) technique was applied to record the initiation and propagation of surface micro-cracks. The obtained results indicate that the fracture process and crack pattern of MRAC are greatly affected by the relative strength of new interfacial transition zone (ITZ) and old ITZ. The bond cracks first appear around the weak ITZs and then propagate into the mortar region by connecting with each other. When the strength of the new ITZ is inferior to that of the old ITZ, the first visible crack mostly appears at the new ITZ region. Also, when the strength of the new ITZ is better than that of the old ITZ, the first visible crack mostly appears at the old ITZ region. When the strength of the new ITZ is equal to that of old ITZ, the first observable cracks appear around both the new and old ITZs. Based on the propagation and coalescence processes of the surface micro-crack, an in-depth analysis was carried out on the whole failure process to reveal the failure mechanism and the crack evolution of recycled aggregate concrete.

Original languageEnglish (US)
Pages (from-to)340-348
Number of pages9
JournalJianzhu Jiegou Xuebao/Journal of Building Structures
Volume35
DOIs
StatePublished - Jan 1 2014

Keywords

  • Crack propagation
  • Digital image correlation technique
  • Failure mechanism
  • Interfacial transition zone
  • Modeled recycled aggregate concrete

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Building and Construction

Fingerprint Dive into the research topics of 'Experimental study on failure mechanism of modeled recycled aggregate concrete under uniaxial compression'. Together they form a unique fingerprint.

Cite this