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<p>This research investigates into the flexural toughness characteristics of novel dog-bone steel fibres in comparison to traditional hooked-end steel fibres within the context of steel fibre-reinforced self-compacting concrete (SFRSCC). Single fibre pull-out tests were conducted on dog-bone steel fibres, revealing a notable increase in the maximum pull-out load with increased embedment length. This behaviour closely resembled the pull-out characteristics observed in straight steel fibres, indicating a relatively weaker mechanical interlock in dog-bone fibres when compared to their hooked-end counterparts. To assess the flexural toughness of dog-bone SFRSCC beams, both static and cyclic four-point bending tests were performed on dog-bone SFRSCC specimens. Utilising various established methods, including ASTM C1609, modified JSCE SF-4, ACI 544, and Trottier and Banthia, flexural toughness parameters were evaluated based on the flexural response. Under static flexural loading conditions, the dog-bone SFRSCC exhibited significantly lower flexural toughness parameters in comparison to hooked-end SFRSCC, primarily attributed to the weaker interfacial bonding provided by dog-bone fibres. However, when subjected to cyclic flexural loading, the results of the flexural toughness models diverged. The ASTM C1609 and ACI 544 models indicated lower flexural toughness parameters for dog-bone SFRSCC relative to hooked-end SFRSCC. In contrast, the modified JSCE SF-4 and Trottier and Banthia models suggested higher flexural toughness parameters for dog-bone SFRSCC. This discrepancy can be explained by the superior re-centring behaviour exhibited by dog-bone SFRSCC under cyclic loading conditions, as determined by the modified JSCE SF-4 and Trottier and Banthia models.</p>

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Re-Centring and Flexural Toughness Performance of Novel Steel Fibre-Reinforced Self-Compacting Concrete

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年9月30日

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  • Badr Hafez,
  • Jovana Glusac,
  • Farhad Aslani

摘要

This research investigates into the flexural toughness characteristics of novel dog-bone steel fibres in comparison to traditional hooked-end steel fibres within the context of steel fibre-reinforced self-compacting concrete (SFRSCC). Single fibre pull-out tests were conducted on dog-bone steel fibres, revealing a notable increase in the maximum pull-out load with increased embedment length. This behaviour closely resembled the pull-out characteristics observed in straight steel fibres, indicating a relatively weaker mechanical interlock in dog-bone fibres when compared to their hooked-end counterparts. To assess the flexural toughness of dog-bone SFRSCC beams, both static and cyclic four-point bending tests were performed on dog-bone SFRSCC specimens. Utilising various established methods, including ASTM C1609, modified JSCE SF-4, ACI 544, and Trottier and Banthia, flexural toughness parameters were evaluated based on the flexural response. Under static flexural loading conditions, the dog-bone SFRSCC exhibited significantly lower flexural toughness parameters in comparison to hooked-end SFRSCC, primarily attributed to the weaker interfacial bonding provided by dog-bone fibres. However, when subjected to cyclic flexural loading, the results of the flexural toughness models diverged. The ASTM C1609 and ACI 544 models indicated lower flexural toughness parameters for dog-bone SFRSCC relative to hooked-end SFRSCC. In contrast, the modified JSCE SF-4 and Trottier and Banthia models suggested higher flexural toughness parameters for dog-bone SFRSCC. This discrepancy can be explained by the superior re-centring behaviour exhibited by dog-bone SFRSCC under cyclic loading conditions, as determined by the modified JSCE SF-4 and Trottier and Banthia models.