International Journal of Concrete Structures and Materials

Korea Concrete Institute (한국콘크리트학회)
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Tensile Properties of Hybrid Fiber-Reinforced Reactive Powder Concrete After Exposure to Elevated Temperatures

  • Li, Haiyan (Mechanics Engineering Department, Shijiazhuang Tiedao University) ;
  • Liu, Gang (Mechanics Engineering Department, Shijiazhuang Tiedao University)
  • Received : 2015.08.19
  • Accepted : 2016.01.04
  • Published : 2016.03.30
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Abstract

The paper presents a research project on the tensile properties of RPC mixed with both steel and polypropylene fibers after exposure to $20-900^{\circ}C$. The direct and the indirect tensile strength (in bending) were measured through tensile experiment on dog-bone specimens and bending experiment on $40{\times}40{\times}160mm$ prisms. RPC microstructure was analyzed using scanning electron microscope. The results indicate that, steel fibers can significantly improve the tensile performance of hybrid fiber-reinforced RPC, whereas polypropylene fibers have no obvious effect on the tensile performance. With increasing temperature, the flexural and axial tensile strength of hybrid fiber-reinforced RPC substantially decrease linearly, which attributes to the deteriorating microstructure. Based on the experimental results, equations are established to express the decay of the flexural and tensile strength with increasing temperature.

Keywords

References

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