Experimental study on performance of CFRP-strengthened RC beams with geopolymer and epoxy
International Journal of Structural Integrity
ISSN: 1757-9864
Article publication date: 6 July 2022
Issue publication date: 12 September 2022
Abstract
Purpose
In this paper, to obtain shear and bending performance of carbon fiber-reinforced polymer (CFRP)-strengthened beams bonded by geopolymers, the effects of impregnated adhesive types, strengthened scheme, CFRP layer and pre-cracked width are investigated, and the performance of CFRP-strengthened beams is validated by the establishment of Finite Element Models (FEMs).
Design/methodology/approach
In this paper, static loading test and finite element analysis of epoxy-CFRP-strengthened (ECS) and geopolymer-CFRP-strengthened (GCS) were carried out, and the bearing capacity and stiffness were compared, the results show that GCS reinforced concrete (RC) beam is feasible and effective.
Findings
The bearing capacity, crack distribution and development, load–deflection curves of GCS RC beams with different pre-crack widths were investigated. The reinforcement effect of geopolymer achieves the same as epoxy, effectively improving the ultimate bearing capacity of the beam, with a maximum increase rate of 28.9%. The failure mode of CFRP is broken in the yield failure stage of GCS RC beam with reasonable strengthening form, and the utilization rate of CFRP is improved. CFRP-strengthened layers, pre-cracked widths significantly affect the mechanical properties, and deformation properties of the strengthened beams.
Originality/value
Compared with ECS RC beams, the bearing capacity and stiffness of GCS RC beams are similar to or even better, indicating that GCS RC beam is feasible and effective. It is a new method for CFRP-strengthened beams, which not only conforms to the concept of national ecological civilization construction, but also provides an economical, environmentally friendly and excellent performance solution for structural reinforcement.
Keywords
Acknowledgements
This study was supported by the “Fundamental Research Funds for the Central Universities” (2572021BJ01) and Heilongjiang Province Postdoctoral Foundation of China (Grant number: LBH-Z20036).
Conflict of interest: The authors declare that there are no conflicts of interest regarding the publication of this article.
Citation
Liu, B., Liu, J., Wen, Y., Hu, Q., Liu, L. and Zhao, S. (2022), "Experimental study on performance of CFRP-strengthened RC beams with geopolymer and epoxy", International Journal of Structural Integrity, Vol. 13 No. 5, pp. 784-812. https://doi.org/10.1108/IJSI-05-2022-0065
Publisher
:Emerald Publishing Limited
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