Steel and Composite Structures

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Fire resistance and residual strength of reactive powder concrete Using metakaolin

  • Jang, Hongseok (Department of Architectural Engineering, Research Center of Industrial Technology, Jeonbuk National University) ;
  • Yi, Jebang (Department of Architectural Engineering, Research Center of Industrial Technology, Jeonbuk National University) ;
  • So, Seungyoung (Department of Architectural Engineering, Research Center of Industrial Technology, Jeonbuk National University)
  • Received : 2020.05.19
  • Accepted : 2020.08.23
  • Published : 2020.09.25
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Abstract

This study investigates the fire resistance characteristics of reactive powder concrete according to changes in the cement content per unit area, mixing ratio of metakaolin (MK), and content of polypropylene fiber. A fire test was conducted, and the resulting residual strength characteristics were investigated through flexural and compressive strength measurements, as well as condition rating classification based on visual evaluation. MK effectively reduced the initial high content of calcium hydroxide, thereby reducing the water vapor pressure generated during pyrolysis and slowing spalling. Furthermore, the pore structure and loose tissue were effective for relieving the water vapor pressure in the event of a fire.

Keywords

Acknowledgement

This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (NRF-2012R1A1A2008719)

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