Advances in concrete construction

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Effect of hybrid polypropylene-steel fibres on strength characteristics of UHPFRC

  • Nuaklong, Peem (Innovative Construction Materials Research Unit, Department of Civil Engineering, Faculty of Engineering, Chulalongkorn University) ;
  • Chittanurak, Jithaporn (Innovative Construction Materials Research Unit, Department of Civil Engineering, Faculty of Engineering, Chulalongkorn University) ;
  • Jongvivatsakul, Pitcha (Innovative Construction Materials Research Unit, Department of Civil Engineering, Faculty of Engineering, Chulalongkorn University) ;
  • Pansuk, Withit (Innovative Construction Materials Research Unit, Department of Civil Engineering, Faculty of Engineering, Chulalongkorn University) ;
  • Lenwari, Akhrawat (Composite Structures Research Unit, Department of Civil Engineering, Faculty of Engineering, Chulalongkorn University) ;
  • Likitlersuang, Suched (Centre of Excellence in Geotechnical and Geoenvironmental Engineering, Department of Civil Engineering, Faculty of Engineering, Chulalongkorn University)
  • Received : 2020.03.16
  • Accepted : 2020.06.10
  • Published : 2020.07.25
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Abstract

This study intends to produce an ultra-high performance fibre reinforced concrete (UHPFRC) made with hybrid fibres (i.e., steel and polypropylene). Compressive and tensile strength characteristics of the hybrid fibres UHPFRC are considered. A total of 14 fibre-reinforced composites (FRCs) with different fibre contents or types of fibres were prepared and tested in order to determine a suitable hybrid fibre combination. The compressive and tensile strengths of each concrete at 7 days were determined. The results showed that a hybrid mix of micro-polypropylene and steel fibres exhibited good compromising performances and is the ideal reinforcement mixture in a strong, cost-effective UHPFRC. In addition, maximum compressive strength of 167 MPa was achieved for UHPFRC using 1.5% steel fibres blended with 0.5% macro-polypropylene fibres.

Keywords

Acknowledgement

This research was supported by the Thailand Research Fund (Grant No. RGU6280001) and the Ratchadapisek Sompoch Endowment Fund (2020), Chulalongkorn University (763014 Climate Change and Disaster Management Cluster). The authors would like to thank the Siam Cement Group (SCG) for supporting materials during tests. Endorsement by SCG is not implied and should not be assumed. The first author would like to acknowledge the Ratchadapisek Somphot Fund for Postdoctoral Fellowship, Chulalongkorn University.

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