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Advances in Concrete Construction Volume 15, Number 6, June 2023 , pages 405-417 DOI: https://doi.org/10.12989/acc.2023.15.6.405 |
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Impact of fine fillers on flowability, fiber dispersion, strength, and tensile strain hardening of UHPC |
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Chung-Chan Hung, Kuo-Wei Wen and Yueh-Ting Chen
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| Abstract | ||
| While ultra-high performance concrete (UHPC) is commonly reinforced with micro straight steel fibers in existing applications, studies have indicated that the use of deformed steel macro-fibers leads to enhanced ductility and post-peak responses for UHPC structural elements, which is of particular importance for earthquake-resistant structures. However, there are potential concerns regarding the use of UHPC reinforced with macro-fibers due to the issues of workability and fiber distribution. The objective of this study was to address these issues by extensively investigating the restricted and non-restricted deformability, filling ability, horizontal and vertical velocities, and passing ability of UHPC containing macro hooked-end steel fibers. A new approach is suggested to examine the homogeneity of fiber distribution in UHPC. The influences of ultra-fine fillers and steel macro-fibers on the workability of fresh UHPC and the mechanics of hardened UHPC were examined. It was found that although increasing the ratio of quartz powder to cement led to an improvement in the workability and tensile strain hardening behavior of UHPC, it reduced the fiber distribution homogeneity. The addition of 1% volume fraction of macro-fibers in UHPC improved workability, but reduced its compressive strength, which is contrary to the effect of micro-fiber inclusion in UHPC. | ||
| Key Words | ||
| fiber dispersion; fine fillers; flowability; macro deformed steel fibers; strain hardening; UHPC | ||
| Address | ||
| Department of Civil Engineering, National Cheng Kung University, 1, University Rd, Tainan City, 701, Taiwan. | ||
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