Effect of CFRP strengthening on the behavior of reinforced concrete beams under corrosive environments

Document Type : Research Paper

Authors

1 Faculty of Engineering, Ferdowsi University of Mashhad, Mashhad, Iran.

2 Department of Civil Engineering, Faculty of Engineering, Ferdowsi University Of Mashhad (FUM)

10.22124/jcr.2023.23083.1599

Abstract

Corrosion of rebars is one of the most important problems in reinforced concrete structures. It may reduce the load capacity or cause failure of structural members. When corrosion occurs, the structure member can be strengthened/repaired using different methods. Due to the durability of FRP (Fiber Reinforced Polymer) materials in corrosive environments, these materials can be used to strengthen/repair the damaged reinforced concrete members against corrosion.

In this study, the effect of Carbon FRP sheets on the flexural behavior of steel reinforced concrete beams in moisture and corrosion conditions is studied. For this purpose, ten reinforced concrete beam specimens with the cross-sectional dimensions of 150 x 200 mm and a length of 1400 mm were made. One specimen was considered as the control specimen without strengthening, and other specimens were subjected under accelerated corrosion conditions with different corrosion rates of 5, 10, and 15 percent.

A comparison of the experimental results showed that the corrosion of longitudinal rebars affects the flexural behavior of reinforced concrete specimens. With increasing corrosion, the load capacity of the specimens decreased. Strengthening of the corroded specimens with CFRP sheets increased the load capacity of the corroded specimens up to 35% compared to the un-strengthened specimen. The results of specimens exposed to re-corrosion condition after strengthening showed that the strengthening of specimens by CFRP sheets effectively reduced further corrosion up to 26.9%.

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References

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