Steel and Composite Structures

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Bond performance between metakaolin-fly ash-based geopolymer concrete and steel I-section

  • Hang Sun (School of Urban Construction, Yangtze University) ;
  • Juan Chen (School of Urban Construction, Yangtze University) ;
  • Xianyue Hu (School of Urban Construction, Yangtze University)
  • Received : 2023.11.23
  • Accepted : 2024.05.22
  • Published : 2024.06.10
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Abstract

The bonding efficacy of steel I-section embedded in metakaolin-fly ash-based geopolymer concrete (MK-FA-GC) was investigated in this study. Push-out tests were conducted on nine column specimens to evaluate the influence of compressive strength of concrete, embedded length of steel I-section, thickness of concrete cover, and stirrup ratio on the bond performance. Failure patterns, load-slip relationships, bond strength, and distribution of bond stress among the specimens were analyzed. The characteristic bond strength of geopolymer concrete (GC) increased with higher compressive strength, longer embedded steel section length, thicker concrete cover, and larger stirrup ratio. Empirical formulas for bond strength at the loading end were derived based on experimental data and a bond-slip constructive model for steel-reinforced MK-FA-GC was proposed. The calculated bond-slip curves showed good agreement with experimental results. Furthermore, numerical simulations using ABAQUS software were performed on column specimens by incorporating the suggested bond-slip relationship into connector elements to simulate the interface behavior between MK-FA-GC and the steel section. The simulation results showed a good correlation with the experimental findings.

Keywords

Acknowledgement

The authors are grateful to the economic funding provided by Science and Technology Bureau of Jingzhou (2023EC38), and Natural Science Foundation of Hubei Province (2023AFB804).

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