Non-destructive testing and evaluation (NDT/NDE) of civil structures rehabilitated using fiber reinforced polymer (FRP) composites

Abstract

The chapter begins by discussing the requirement for performance assessment of FRP rehabilitated structures by NDT/NDE methodologies. The general classification of NDT techniques are introduced, followed by the concept of structural health monitoring (SHM) as related to the real-time performance monitoring of the rehabilitated structures. It then explores the suitability of major NDT techniques for defect detection and assessment of FRP composites and FRP rehabilitated concrete structures. The NDT methods reviewed include visual inspections, acoustic emission testing, impact-echo methods, ultrasonics, radiography, ground penetrating radar, microwave based techniques, thermography, optical and laser techniques, and superconducting quantum interference methods. The chapter includes a brief introduction into the basic principles, methodologies, and types of fiber optic sensors, and their applications in FRP composite and FRP rehabilitated concrete structures. Smart structure systems with fiber optic sensors for real-time monitoring of FRP rehabilitated concrete structures are then discussed. A summary of the methods is provided at the end.