What the study found
The study found that carbon textile-reinforced concrete (TRC, a concrete layer reinforced with carbon textile) improved the flexural performance of an aged, pre-cracked reinforced concrete bridge slab-beam. The strengthened beam showed higher flexural capacity and better crack control than the unstrengthened specimen.
Why the authors say this matters
The authors suggest the findings are relevant because they show TRC can be used to rehabilitate deteriorated bridge members under sustained service load, which is a repair condition intended to reflect in-service use. They conclude that the results support TRC as a way to restore and enhance flexural performance in aged bridge elements.
What the researchers tested
The researchers studied a 30-year-old reinforced concrete slab-beam taken from the Ben Cho Bridge that already had flexural cracks. They used both experiments and finite element simulations with ATENA to assess strengthening with carbon TRC while keeping the beam under sustained load during repair.
What worked and what didn't
TRC strengthened the beam, with a 24.8% increase in flexural capacity compared with the unstrengthened specimen. Crack widths and spacing were reduced to about one-third to one-half of those in the control beam, and the simulations closely matched the load-deflection response and predicted ultimate loads within 2.5% to 3.5% deviation. The abstract does not report any major strengthening failure, but it does note that carbon textiles exceeded the 12‰ design limit specified in ACI 549.4 R-20.
What to keep in mind
The summary describes one extracted bridge slab-beam, so the findings may be limited to this specific aged member and test setup. The abstract does not describe broader field validation, durability over time, or additional limitations beyond the single case studied.
Key points
- A 30-year-old pre-cracked bridge slab-beam was strengthened with carbon textile-reinforced concrete.
- The strengthened beam achieved a 24.8% increase in flexural capacity versus the unstrengthened specimen.
- Crack widths and spacing were reduced to roughly one-third to one-half of the control beam's values.
- Finite element simulations in ATENA predicted ultimate loads within 2.5% to 3.5% of the experiments.
- Carbon textiles exceeded the 12‰ design limit stated in ACI 549.4 R-20.
Disclosure
- Research title:
- Carbon textile reinforcement improved an aged cracked bridge slab-beam
- Authors:
- Huy Cuong Nguyen, Dang Quang Ngo, Văn Hiệp Vũ, Thi Hoai Ho, Dang Dung Le
- Institutions:
- University of Transport and Communications, University of Transport and Communications, University of Transport and Communications, University of Transport and Communications, University of Transport and Communications
- Publication date:
- 2026-04-02
- OpenAlex record:
- View
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