Characterizing damage modes and size effects in high-strength concrete under hydrostatic and triaxial stress states using X-ray microtomography

Brett Williams, Anna Madra, William Heard, Steven Graham, Michael Grotke, Michael Hillman, Xu Nie

Research output: Contribution to journalArticlepeer-review

Abstract

Damage modes are drastically different for concrete under complex stress states. This study investigates damage in high-strength concrete under triaxial loading with confinement pressures up to 200 MPa, while also considering effects from changes in specimen length-to-diameter ratio. Damage was observed and segmented using X-ray microtomography. Hydrostatic pressures up to 200 MPa were fully reversible and caused no detectable damage, thus triaxial deviator stresses dictated damage extent. Brittle failure modes produced shear cracks at angles of 25-30° that became more distributed with increased confinement. Ductile failure modes observed pore collapse with residual strengths being ∼30–50% of pristine strengths.

Original languageEnglish (US)
Article number125338
JournalConstruction and Building Materials
Volume311
DOIs
StatePublished - Dec 13 2021

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

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