Flexural Durability of Seawater Coral Aggregate Concrete Beams Reinforced with Basalt FRP Bars
Publication: Journal of Composites for Construction
Volume 26, Issue 2
Abstract
The application of fiber-reinforced polymer (FRP) reinforcement in coral aggregate concrete (CAC) structures is a new solution to the shortage of construction materials on islands and reefs far from the mainland and to the insufficient durability of steel-reinforced concrete members. However, the understanding of the durability of FRP bar-reinforced CAC members is not yet clear, which greatly limits the evaluation and design of their long-term performance. In this paper, accelerated degradation tests were carried out in a high-temperature and high-humidity marine environment to study the durability of CAC beams reinforced with basalt FRP (BFRP) bars and stirrups. Four-point flexural tests were performed on beams that have been subjected to environmental conditions to study the effects of environmental time, temperature, and concrete type on the failure mode, cracking and ultimate moment, midspan deflection, crack width and pattern, and ductility. In addition, an engineered cementitious composite (ECC)–CAC composite beam reinforced with BFRP bars was proposed to improve the mechanical properties and durability of the CAC beam reinforced with BFRP bars. The results showed that, in the early stage of environmental conditions (1–2 months), the effect of the environment on the mechanical properties of the CAC beam reinforced with BFRP bars was beneficial. With increasing environmental condition time, the effect of environmental conditions on the mechanical properties of the CAC beam reinforced with BFRP bars gradually weakened. The failure mode, deflection, crack width, and crack pattern of the ECC–CAC composite beam reinforced with BFRP bars were greatly improved compared with those of the CAC beam reinforced with BFRP bars.
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Acknowledgments
The authors acknowledge the financial support from the Jiangsu Provincial Key Research and Development Program (BE2019642).
Notation
The following symbols are used in this paper:
- Ee
- elastic energy, calculated by the triangle area formed by the oblique line made through the limit deflection point;
- Et
- total energy of the bending moment–deflection curve;
- Mcr-exp
- cracking moment obtained from the test (kN · m);
- Mn
- ultimate moment of beams (MPa);
- Mn-exp
- ultimate bending moment from the test (kN · m); and
- μE
- ductility index obtained by the energy-based method.
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Published In
Journal of Composites for Construction
Volume 26 • Issue 2 • April 2022
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© 2022 American Society of Civil Engineers.
History
Received: Aug 23, 2021
Accepted: Dec 17, 2021
Published online: Feb 4, 2022
Published in print: Apr 1, 2022
Discussion open until: Jul 4, 2022
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