Enhancing the tensile performance of ultra-high-performance concrete through novel curvilinear steel fibers

Jae Jin Kim, Yun Sik Jang, Doo Yeol Yoo

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)


This study developed a novel curvilinear steel fiber to improve the tensile behavior of ultra-high-performance concrete (UHPC) and to mitigate the stress concentration observed in conventional deformed steel fibers. To achieve this, four curvilinear steel fibers of different curvatures (0.02–0.10 mm range) and a commercial smooth, straight steel fiber were employed. The average and equivalent bond strengths could be improved using the curvilinear steel fibers than the straight fiber from the UHPC matrix. The tensile performance of UHPC was improved by using the curvilinear fibers of curvature (κ) up to 0.04 mm. The tensile strength and energy absorption capacity were significantly increased up to 52% and 174%, respectively, by replacing the straight steel fiber to the moderately curved steel fibers with κ = 0.04 mm, which is the optimum fiber type. The highly curved steel fibers, i.e., with curvatures beyond 0.04 mm, slightly deteriorated the tensile performance because of the poorer fiber dispersibility and excessive matrix damage. A comparison of the pullout and tensile parameters showed that the equivalent bond strength of inclined steel fibers in UHPC is the most appropriate indicator for predicting the tensile performance.

Original languageEnglish
Pages (from-to)7570-7582
Number of pages13
JournalJournal of Materials Research and Technology
Issue number4
Publication statusPublished - 2020 Jul 1

Bibliographical note

Publisher Copyright:
© 2020 The Author(s)

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Biomaterials
  • Surfaces, Coatings and Films
  • Metals and Alloys


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