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  The Use of Polymer Fibre Reinforced Concrete in Underground Construction Projects in Asia

  This paper discusses the rise in the use of polymer fibre reinforced concrete (PFRC) in underground construction projects in Asia. Historically, polymer fibres were mainly micro polymer fibres with tensile strengths of 200MPa to 400MPa. These micro polymer fibres were used in concrete to control cracks and prevent spalling of concrete during a fire in a tunnel. Polymer fibre producers experimenting with improved petroleum resins, production methods and different surface patterns have managed to produce higher strengths macro polymer fibres. Macro polymer fibres are now achieving tensile strengths above 550MPa. These higher strength macro polymer fibres are successfully replacing partially or completely the steel reinforcing bars and/or steel fibres in reinforced concrete used in underground structures in Asia. This evolution is further enhanced by the fact that many of these polymer fibres are produced locally in Asia thus resulting in reduced shipping costs. The use of polymer fibres in underground construction projects will further improve the efficient and sustainable usage of valuable raw materials and contribute to efforts in reducing our carbon footprint.

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