Nondestructive detection of crack density in ultra-high performance concrete using multiple ultrasound measurements: Evidence of microstructural change

Seungo Baek, Bada Lee, Jeong Hoon Rhee, Yejin Kim, Hyoeun Kim, Seungkwan Hong, Goangseup Zi, Gun Kim, Tae Sup Yun

Research output: Contribution to journalArticlepeer-review

Abstract

This study nondestructively examined the evolution of crack density in ultra-high performance concrete (UHPC) upon cyclic loading. Uniaxial compression was repeatedly applied to the cylindrical specimens at levels corresponding to 32% and 53% of the maximum load-bearing capacity, each at a steady strain rate. At each stage, both P-wave and S-wave velocities were measured in the absence of the applied load. In particular, the continuous monitoring of P-wave velocity from the first loading prior to the second loading allowed real-time observation of the strengthening effect during loading and the recovery effect afterwards. Increasing the number of cycles resulted in the reduction of both elastic wave velocities and Young’s modulus, along with a slight rise in Poisson’s ratio in both tested cases. The computed crack density showed a monotonically increasing trend with repeated loading, more significant at 53% than at 32% loading. Furthermore, the spatial distribution of the crack density along the height was achieved, validating the directional dependency of microcracking development. This study demonstrated the capability of the crack density to capture the evolution of microcracks in UHPC under cyclic loading condition, as an early-stage damage indicator.

Original languageEnglish
Pages (from-to)399-407
Number of pages9
JournalComputers and Concrete
Volume33
Issue number4
DOIs
Publication statusPublished - 2024 Apr

Bibliographical note

Publisher Copyright:
Copyright © 2024 Techno-Press, Ltd.

Keywords

  • crack density
  • cyclic loading
  • nondestructive evaluation
  • ultra-high performance concrete
  • wave velocity

ASJC Scopus subject areas

  • Computational Mechanics

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