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Carbon Fiber-Reinforced Polymer Rod Embedment Depth Influence on Concrete Strengthening

  • Research Article-Civil Engineering
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Abstract

The use of carbon fiber-reinforced polymer (CFRP) rods offers a good solution for external strengthening of flexural reinforced concrete (RC) members. Limited data are available on the behavior of beams externally reinforced with CFRP rods under a loading–unloading protocol, which is of great importance for structural components subjected to vehicle loading. The embedment depth mandated by the majority of standards cannot always be acquired due to concrete cover limitations; the influence of embedment depth under this loading–unloading sequence needs to be investigated. This research studied the effects of rod embedment depth by comparing fully-embedded rods with half-embedded rods under a loading–unloading protocol and comparing the results with monotonic responses. An identical specimen without CFRP reinforcement functioned as the controlling element. The near-surface mounted technique (NSM) was used to integrate the rods with the concrete. The results show that CFRP rods positively affect the load-carrying capacity under a loading–unloading condition. The rods reduce the member’s ductility under monotonic loading but have no negative impact under loading–unloading. Whereas the difference in embedment depth configuration slightly affected the enhancement under monotonic loading, the half-embedded rods drastically reduced the capacity improvement under the loading–unloading sequence. An embedment depth deviating from the advised depth, should not be implemented for members subjected to a loading–unloading condition. The CFRP placement method had an impact on the failure behavior of the elements. The half-embedded rod failed by debonding between the rod and the epoxy resin, while the fully-embedded members were characterized by concrete spalling.

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Authors and Affiliations

  1. Department of Civil Engineering, Diponegoro University, Semarang, Indonesia

    Ay Lie Han

  2. Department of Civil Engineering, National Cheng Kung University, Tainan, Taiwan

    Hsuan-Teh Hu, Fu-Pei Hsiao & Yanuar Haryanto

  3. Department of Civil and Disaster Prevention Engineering, College of Engineering and Science, National United University, Miaoli, Taiwan

    Hsuan-Teh Hu

  4. Department of Architecture, College of Engineering, Nihon University, Tokyo, Japan

    Buntara S. Gan

  5. National Center for Research on Earthquake Engineering, Taipei, Taiwan

    Fu-Pei Hsiao

  6. Department of Civil Engineering, Faculty of Engineering, Jenderal Soedirman University, Purwokerto, Indonesia

    Yanuar Haryanto

Authors
  1. Ay Lie Han
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  2. Hsuan-Teh Hu
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  3. Buntara S. Gan
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  4. Fu-Pei Hsiao
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  5. Yanuar Haryanto
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Contributions

HAL is the main researcher and author of this work. She designed the research methodology and was responsible for the overall experimental testing, data collection, and data processing. HTH performed the data compiling and was responsible for all data interpretations and visual readings during and after the experiments. BSG concentrated on the data processing, resulting in the final conclusion, and presented all graphical figures presented in this work. FPH constructed all calculations and visualizations, resulting in the relationship graphs and tables, and supported the data analysis process, especially for the loading–unloading protocol. YH was the researcher responsible for specimen setup, operating the reading equipment, and controlling all precision instruments.

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Correspondence to Ay Lie Han.

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The data and material presented in this paper are available for use by researchers in this field and might be used with proper citations.

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Han, A.L., Hu, HT., Gan, B.S. et al. Carbon Fiber-Reinforced Polymer Rod Embedment Depth Influence on Concrete Strengthening. Arab J Sci Eng 47, 12685–12695 (2022). https://doi.org/10.1007/s13369-022-06601-2

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  • DOI: https://doi.org/10.1007/s13369-022-06601-2

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