TY - JOUR
T1 - Bond strength of FRP bars in recycled-aggregate concrete
AU - Godat, Ahmed
AU - Aldaweela, Shaima
AU - Aljaberi, Hamda
AU - Al Tamimi, Noura
AU - Alghafri, Ebtesam
N1 - Funding Information:
The authors express their appreciation to the Research Affairs Office at the United Arab Emirates University for financial support of the project under fund grant #G00003194. The authors are grateful to Al-Ain Recycling Plant for providing the coarse recycled-aggregate. The collaboration of Eng. Abdelrahman Alsallamin, Faisal Abdulwahab (technician) and Al Hoty-Stanger Laboratories in Abu-Dhabi in conducting the test is acknowledged.
Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2021/1/18
Y1 - 2021/1/18
N2 - This study presents an experimental program conducted to investigate the bond strength of FRP bars in recycled-aggregate concrete compared to the one in normal-aggregate concrete for better evaluation of the results. The experimental program contains thirty six specimens that are tested using the direct pull-out test. In this study, glass, carbon and basalt FRP bars are used with 12 mm diameter and bar bond length of 5d, where d is the bar diameter. The FRP bars are casted in different recycled-aggregate concrete strengths of 30, 45 and 60 MPa. The behaviour of bars in natural-aggregate concrete strength of 30 MPa is used as a benchmark and its behaviour is compared with the ones in recycled-aggregate concrete. The impact of the concrete strengths considered is identified based on the gain in the bond behaviour. The experimental results demonstrate the promise of the recycled aggregates as an alternative to natural aggregates in FRP reinforced concrete. In addition, the use of recycled aggregate enlarges the bearing friction behaviour between the FRP bars and concrete. Analytical models proposed in the literature for the bond behaviour of FRP reinforced concrete are compared with the experimental results obtained here. Organgun et al. equation, and the CMR and the BPE models can accurately predict the bond strength, and bond stress–slip behaviour, respectively, of FRP bars in recycled-aggregate concrete.
AB - This study presents an experimental program conducted to investigate the bond strength of FRP bars in recycled-aggregate concrete compared to the one in normal-aggregate concrete for better evaluation of the results. The experimental program contains thirty six specimens that are tested using the direct pull-out test. In this study, glass, carbon and basalt FRP bars are used with 12 mm diameter and bar bond length of 5d, where d is the bar diameter. The FRP bars are casted in different recycled-aggregate concrete strengths of 30, 45 and 60 MPa. The behaviour of bars in natural-aggregate concrete strength of 30 MPa is used as a benchmark and its behaviour is compared with the ones in recycled-aggregate concrete. The impact of the concrete strengths considered is identified based on the gain in the bond behaviour. The experimental results demonstrate the promise of the recycled aggregates as an alternative to natural aggregates in FRP reinforced concrete. In addition, the use of recycled aggregate enlarges the bearing friction behaviour between the FRP bars and concrete. Analytical models proposed in the literature for the bond behaviour of FRP reinforced concrete are compared with the experimental results obtained here. Organgun et al. equation, and the CMR and the BPE models can accurately predict the bond strength, and bond stress–slip behaviour, respectively, of FRP bars in recycled-aggregate concrete.
KW - Analytical models
KW - Bond strength
KW - Bond stress–slip relations
KW - Direct pull-out test
KW - FRP bars
KW - Recycled-aggregate concrete
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U2 - 10.1016/j.conbuildmat.2020.120919
DO - 10.1016/j.conbuildmat.2020.120919
M3 - Article
AN - SCOPUS:85092252881
SN - 0950-0618
VL - 267
JO - Construction and Building Materials
JF - Construction and Building Materials
M1 - 120919
ER -