Dynamic pullout behavior of multiple steel fibers in UHPC: Effects of fiber geometry, inclination angle, and loading rate

Eun Yoo Jang, Jung J. Kim, Doo Yeol Yoo

Research output: Contribution to journalArticlepeer-review

Abstract

This study examined the influences of fiber geometry, inclination angle, and loading rate on the pullout behavior of multiple steel fibers in ultra-high-performance concrete (UHPC). For this, two different steel fiber types, i.e., straight (S-) and hooked (H-), four different inclination angles (0°-60°), and four different loading rates (0.018 mm/s to 1200 mm/s) were considered. Test results indicated that the pullout performance of S-fibers in UHPC was improved by increasing the loading rate. The highest maximum pullout load of the S-fiber was obtained at the inclination angle of 30° or 45°. The maximum pullout loads of H-fibers also increased with increases in the loading rate, while their slip capacities rather decreased. No specific inclination angle was identified in the case of H-fibers that caused the highest maximum pullout load. The H-fibers yielded higher average bond strengths than S-fibers, but similar or even smaller pullout energies under the impact loads. The aligned S-fiber in UHPC was most sensitive to the loading rate compared to the inclined S-fiber and aligned H-fiber. The rate sensitivity became moderate with the fiber inclination angle. Consequently, the aligned S-fiber was recommended to achieve the best energy absorption capacity and interfacial bond strength at various impact loads.

Original languageEnglish
Article number3365
JournalMaterials
Volume12
Issue number20
DOIs
Publication statusPublished - 2019 Oct 1

Bibliographical note

Funding Information:
Funding: This research was funded by the Ministry of Land, Infrastructure and Transport of the Korean government with a grant (19CTAP-C152069-01) from the Technology Advancement Research Program

Publisher Copyright:
© 2019 by the authors.

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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