Abstract
Conventional reinforced concrete (RC) structures are commonly associated with the corrosion of steel reinforcement. The application of carbon fiber reinforced polymer (CFRP) bars as flexural reinforcement has become a new promising option. This paper presents a state-of-the art flexural strength on concrete beams reinforced with CFRP bars. Concrete compressive and CFRP bar tensile strain, reinforcement ratio, types of surface treatment on CFRP bar and concrete compressive strength were identified as aspects of behavior. Significant findings in the literature had manifested all aspects of behavior that were affecting the flexural strength, deflections and crack characteristics of CFRP RC beams. In addition, the experimental result on 98 specimens of CFRP RC beams from the literature show that ACI 440.1R-15 and CSA S806-12 standards underestimate the ultimate flexural moment capacity of CFRP RC beams. On the other hand, Kara and Ashour predictions are more accurate with the experimental values. Moreover, hotspot research topics were also highlighted for further considerations in future studies.
Highlights
Corrosion of steel reinforcement is a common threat to the reinforced concrete (RC)structures that are exposed to the marine, aggressive and highly corrosive environment
On the basis of performing the analysis of the systematic literature, several conclusions can be manifested with regard to flexural strength of carbon fiber reinforced polymer (CFRP) RC beams:
- Over 98 rectangular CFRP RC beam specimens were mined from the works of literature and presented a comprehensive overview from the systematic review analysis
Summary
Corrosion of steel reinforcement is a common threat to the reinforced concrete (RC). structures that are exposed to the marine, aggressive and highly corrosive environment. CFRP bars are the most resistant to chemical environments, including acid, alkaline and saline solutions [13–15] With these significant advantages, CFRP bars have attracted great interest to replace steel bars in RC structures [7,16]. Most of the researchers and design codes encourage the design of CFRP RC beams as over-reinforced since it leads to a less catastrophic failure of CFRP ruptures [5–7,18–21] It exhibits excessive deflections and wider cracks at serviceability limit states (SLS) due to a lower modulus of elasticity than steel bars [20,22,23]. To take full advantage of the knowledge and data mined from the literature, this review study focuses on several fundamental issues related to flexural strength This primarily emphasis the material properties and behavior for concrete and CFRP bars—a normal practice in the experimental works and flexural behavior of the RC beam reinforced with CFRP bars. Experimental results are compared with the international design standards, and hotspot research topics for future investigations are discussed in this study
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