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Acoustic Emission-based Shear Fracture Characterization of Ultra-high Performance Concrete with Varying Steel Fiber Contents
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  • Zixian Liu,
  • Menghan Fang,
  • Yubo Jiao,
  • Yaojia Chen,
  • Hua Yang,
  • Qifan Wu
Zixian Liu
Beijing University of Technology
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Menghan Fang
Beijing University of Technology
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Yubo Jiao
Beijing University of Technology

Corresponding Author:[email protected]

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Yaojia Chen
Beijing University of Technology
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Hua Yang
Beijing University of Technology
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Qifan Wu
Beijing University of Technology
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Abstract

This study investigates the shear fracture behaviors in UHPC under direct shear conditions using Z-shaped specimens and acoustic emission (AE) monitoring. The effect of steel fiber (SSF) contents (1%, 2%, 2.5%, and 3%) on the failure process and the relative slip of cracks at different loading stages were measured and evaluated. The results indicate that increasing the SSF content significantly enhances the ultimate shear stress and ductility, effectively limits crack propagation and formation, and reduces the extent of damage for UHPC. During the failure process, an increase in the SSF content results in higher cumulative AE energy and a tendency for the peak frequency to shift towards the low-frequency range. Additionally, increasing the SSF content expands the range of wavelet entropy values and delays the occurrence of wavelet entropy. Due to the reinforcement effects of SSF, the primary crack type evolved from shear to tensile during the failure process.
Submitted to Fatigue & Fracture of Engineering Materials & Structures
Submission Checks Completed
Assigned to Editor
Reviewer(s) Assigned
06 Jul 2024Reviewer(s) Assigned
04 Sep 2024Review(s) Completed, Editorial Evaluation Pending
06 Sep 2024Editorial Decision: Revise Minor
04 Oct 20241st Revision Received
05 Oct 2024Submission Checks Completed
05 Oct 2024Assigned to Editor
06 Oct 2024Reviewer(s) Assigned
16 Oct 2024Review(s) Completed, Editorial Evaluation Pending
19 Oct 2024Editorial Decision: Accept