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FRP fibre-cementitious matrix interfacial bond under time-dependent loading

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Abstract

This paper presents the behavior of the interfacial bond between an innovative FRP fibre and cement mortar under time-dependent loading. Two types of FRP fibres—GFRP and CFRP were investigated. Particularly, the fibre pullout response under quasi-static loading is compared with the response under dynamic loading. To gauge the long term behavior of cracked fibre reinforced composites, fibre relaxation tests were conducted in which initial strain was imparted and sustained, and the relaxation of the composite in terms of drop in load over time period was monitored at room temperature as well as at 50 °C. FRP fibres were found to be to some extent sensitive to loading rate, with an increase in the range of 30–50% in the peak load under dynamic loading. The GFRP fibres itself depicted higher strengths under dynamic loading rate. Under a sustained fibre slip, FRP fibres showed a lower relaxation at both room temperature and at 50 °C compared to commercially available steel and polypropylene fibres. There was also no conclusive change in pullout response in specimen subjected to sustained strains compared to reference.

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Acknowledgements

The authors gratefully acknowledge the support received from the Composites Research Network of the Materials Engineering Department at the University of British Columbia. The authors are also grateful for the financial support received from the Tricon Concrete Finishing Company and the Natural Sciences and Engineering Research Council of Canada (NSERC). As well, we wish to show our gratitude for the support given us by the Canada-India Research Centre of Excellence (IC-IMPACTS).

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  1. Department of Civil Engineering, University of British Columbia, 6250 Applied Science Lane, Vancouver, BC, V6T 1Z4, Canada

    Mohammed Farooq & Nemkumar Banthia

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  1. Mohammed Farooq
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  2. Nemkumar Banthia
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Correspondence to Mohammed Farooq.

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Farooq, M., Banthia, N. FRP fibre-cementitious matrix interfacial bond under time-dependent loading. Mater Struct 52, 109 (2019). https://doi.org/10.1617/s11527-019-1409-y

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