Failure Criteria and Constitutive Relationship of Lightweight Aggregate Concrete under Triaxial Compression

Peihuan Ye, Yuliang Chen, Zongping Chen, Jinjun Xu, Huiqin Wu

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

This paper investigates the compression behavior and failure criteria of lightweight aggregate concrete (LAC) under triaxial loading. A total of 156 specimens were tested for three parameters: concrete strength, lateral confining pressure and aggregate immersion time, and their effects on the failure mode of LAC and the triaxial stress-strain relationship of LAC is studied. The research indicated that, as the lateral constraint of the specimen increases, the failure patterns change from vertical splitting failure to oblique shearing failure and then to indistinct traces of damage. The stress-strain curve of LAC specimens has an obvious stress plateau, and the curve no longer appears downward when the confining pressure exceeds 12 MPa. According to the experimental phenomenon and test data, the failure criterion was examined on the Mohr–Coulomb theory, octahedral shear stress theory and Rendulic plane stress theory, which well reflects the behavior of LAC under triaxial compression. For the convenience of analysis and application, the stress-strain constitutive models of LAC under triaxial compression are recommended, and these models correlate well with the test results.

Original languageEnglish
Article number507
JournalMaterials
Volume15
Issue number2
DOIs
StatePublished - 1 Jan 2022

Keywords

  • Failure mechanism
  • Fly ash ceramsite
  • Lightweight aggregate concrete
  • Stress-strain constitutive relationships
  • Triaxial behavior

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