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Computers and Concrete
  Volume 26, Number 2, August 2020, pages 115-125
DOI: http://dx.doi.org/10.12989/cac.2020.26.2.115
 


Bond behavior of PP fiber-reinforced cinder concrete after fire exposure
Bin Cai, Ansheng Wu and Feng Fu

 
Abstract
    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 800oC for 2 h duration respectively, which is followed by subsequent compressive and tensile tests at room temperature. The concreterebar 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.
 
Key Words
    cinder; bond strength; fire performance PP fibre; fire test
 
Address
Bin Cai: School of Civil Engineering, Jilin Jianzhu University, Changchun, 130118, China; School of Mathematics, Computer Science and Engineering, City, University of London, London, EC1V 0HB, UK
Ansheng Wu: School of Civil Engineering, Jilin Jianzhu University, Changchun, 130118, China
Feng Fu: School of Mathematics, Computer Science and Engineering, City, University of London, London, EC1V 0HB, UK
 

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