Damage Detection in FRP-Reinforced Concrete Elements

Area of Science:

• Civil Engineering
• Materials Science
• Structural Health Monitoring

Background:

• Fiber-Reinforced Polymer (FRP) composites offer superior properties like corrosion resistance and durability compared to steel in concrete structures.
• Limited research exists on Non-Destructive Testing (NDT) methods for FRP-reinforced concrete (FRP-RC), hindering widespread adoption due to assessment challenges.

Purpose of the Study:

• To evaluate the applicability of Ground-Penetrating Radar (GPR) and Phased Array Ultrasonic (PAU) for detecting damage in FRP-RC elements.
• To identify the detection capabilities and limitations of GPR and PAU for various FRP types and defect scenarios.

Main Methods:

• Investigated three slab specimens with Glass-FRP (GFRP), Carbon-FRP (CFRP), and Basalt-FRP (BFRP) reinforcements.
• Varied bar diameter, depth, and introduced defect types to assess NDT method performance.
• Compared damage detection results from GPR and PAU techniques.

Main Results:

• GPR successfully detected damage in GFRP bars and CFRP strands.
• PAU demonstrated limitations, effectively detecting damage only in CFRP strands.
• Both methods showed potential but also highlighted specific limitations for FRP-RC assessment.

Conclusions:

• Conventional NDT methods like GPR and PAU can be applied to FRP-RC structures for damage detection.
• Further research is needed to refine NDT techniques for broader applicability and reliability in FRP-RC.
• The study provides insights into the current capabilities and future research directions for NDT of FRP-RC.