Steel and Composite Structures

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Flowability and mechanical characteristics of self-consolidating steel fiber reinforced ultra-high performance concrete

  • Moon, Jiho (Department of Civil Engineering, Kangwon National University) ;
  • Youm, Kwang Soo (GS Construction & Engineering) ;
  • Lee, Jong-Sub (School of Civil, Environmental and Architectural Engineering, Korea University) ;
  • Yun, Tae Sup (School of Civil and Environmental Engineering, Yonsei University)
  • Received : 2022.03.09
  • Accepted : 2022.05.07
  • Published : 2022.05.10
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Abstract

This study investigated the flowability and mechanical properties of cost-effective steel fiber reinforced ultra-high performance concrete (UHPC) by using locally available materials for field-cast application. To examine the effect of mixture constituents, five mixtures with different fractions of silica fume, silica powder, ground granulated blast furnace slag (GGBS), silica sand, and crushed natural sand were proportionally prepared. Comprehensive experiments for different mixture designs were conducted to evaluate the fresh- and hardened-state properties of self-consolidating UHPC. The results showed that the proposed UHPC had similar mechanical properties compared with conventional UHPC while the flow retention over time was enhanced so that the field-cast application seemed appropriately cost-effective. The self-consolidating UHPC with high flowability and low viscosity takes less total mixing time than conventional UHPC up to 6.7 times. The X-ray computed tomographic imaging was performed to investigate the steel fiber distribution inside the UHPC by visualizing the spatial distribution of steel fibers well. Finally, the tensile stress-strain curve for the proposed UHPC was proposed for the implementation to the structural analysis and design.

Keywords

Acknowledgement

This work was supported in part by the National Research Foundation of Korea (NRF) Grant funded by the Korea government (MSIT) (Nos. 2021R1A5A1032433) and in part by Ministry of Land, Infrastructure and Transport of the Korean government via Railway Technology Research Program (22TDPP-C161678-02).

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