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Synthesis Study Quantifying the Effect of UHPC Fiber Dispersion and Orientation in Structural Members
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2021-11-01
[PDF-5.92 MB]
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Abstract:Ultra high performance concrete (UHPC) has been researched and implemented in the State of Florida for its superior structural and durability performance. Despite several successful structural level demonstrations, fiber dispersion and orientation remain a concern in the UHPC and general fiber-reinforced concrete communities. Quantifying the actual fiber dispersion and orientation status in real structural members and understanding their effect on structural performance are important to understand the reliability of UHPC members and quality control requirements. UHPC design codes from other countries include reduction factors based on UHPC placement and fiber orientation for full-scale specimens. This research is a synthesis study to understand those factors and what research studies or rationale they are based upon to assist the design and research on UHPC at FDOT. This technical report summarizes the findings in the synthesis study. All relevant design codes, guidelines, recommendations, and reports in France, Germany, Japan, South Korea, Canada, U.S., Switzerland, and Australia are identified and reviewed with a focus on methods and design factors to address the fiber dispersion and orientation. The background work behind the fiber orientation factors of these documents are also reviewed in detail. In addition, existing literature that correlates casting sequence and flow properties of UHPC with fiber orientation and mechanical properties of UHPC at the material level and the structural scale are also reviewed. All the findings are documented in the report. Recommendations for consideration of fiber orientation in the design and future research work are also provided.
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