Computers and Concrete

  • 제26권2호
  • /
  • Pages.115-125
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  • 2020
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  • 1598-8198(pISSN)
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  • 1598-818X(eISSN)
테크노프레스 (Techno-Press)
권호 표지
DOI QR코드

DOI QR Code

Bond behavior of PP fiber-reinforced cinder concrete after fire exposure

  • Cai, Bin (School of Civil Engineering, Jilin Jianzhu University) ;
  • Wu, Ansheng (School of Civil Engineering, Jilin Jianzhu University) ;
  • Fu, Feng (School of Mathematics, Computer Science and Engineering, City, University of London)
  • 투고 : 2019.06.28
  • 심사 : 2020.08.04
  • 발행 : 2020.08.25
⟨ 이전 논문 다음 논문 ⟩

초록

To reduce the damage of concrete in fire, a new type of lightweight cinder aggregate concrete was developed due to the excellent fire resistance of cinder. To further enhance its fire resistance, Polypropylene (PP) Fibers which can enhance the fire resistance of concrete were also used in this type of concrete. However, the bond behavior of this new type of concrete after fire exposure is still unknown. To investigate its bond behavior, 185 specimens were heated up to 22, 200, 400, 600 or 800℃ for 2 h duration respectively, which is followed by subsequent compressive and tensile tests at room temperature. The concrete-rebar bond strength of C30 PP fiber-reinforced cinder concrete was subsequently investigated through pull-out tests after fire exposure. The microstructures of the PP fiber-reinforced cinder concrete and the status of the PP fibre at different temperature were inspected using an advanced scanning electron microscopy, aiming to understand the mechanism of the bonding deterioration under high temperature. The effects of rebar diameter and bond length on the bond strength of PP fiber-reinforced cinder concrete were investigated based on the test results. The bond-slip relation of PP fiber-reinforced cinder concrete after exposure at different temperature was derived based on the test results.

키워드

과제정보

This research was financially supported by the Foundation of China Scholarship Council (no.201805975002) National Natural Science Foundation of China (no. 51678274), Science and Technological Planning Project of Ministry of Housing and Urban-Rural Development of the People's Republic of China (no.2017-K9-047). The authors wish to acknowledge the sponsors. However, any opinions, findings, conclusions and recommendations presented in this paper are those of the authors and do not necessarily reflect the views of the sponsors.

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