Nondestructive testing (NDT) technologies are available to help transportation agencies evaluate the condition of concrete bridge decks or tunnel linings and detect subsurface defects that the eye cannot see. Developed through SHRP2, these methods help to define the actual extent of deterioration—beyond what can be seen—for improved and more effective preservation strategies saving transportation agencies time and money. Nondestructive Testing for Concrete Bridge Decks (R06A) includes a collection of sensor technologies for evaluating the condition of concrete bridge decks. The technologies include: Impact Echo (IE), Ultrasonic Surface Waves (USW), Impulse Response (IR), Ground-Penetrating Radar (GPR), Infrared Thermography (IRT) Analysis, Electrical Resistivity (ER), Galvanostatic Pulse (GVP), and Half-Cell Potential (HCP). A selection matrix tool helps transportation professionals select the appropriate NDT technologies for specific applications and identifies test procedures, protocols, available standards, and guidelines. Nondestructive Testing for Tunnel Linings (R06G) includes a variety of mobile-scanning and hand-held technologies for mapping voids, debonding, delaminations, moisture, and other defects behind or within tunnel linings. Some of these technologies allow vehicles to drive through the tunnel and conduct the condition assessment without closing lanes. A web-based evaluation tool, called NDE web manual, has been developed by FHWA to help transportation professionals select the appropriate NDT technologies for specific applications. | 