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Nondestructive Testing for Concrete Bridge Decks and Tunnel Linings (R06 A/G)
Product Overview

Beneath the surface of many of America’s bridges and tunnels are structural deficiencies that the eye can’t see. Now, new nondestructive testing (NDT) technologies are available to help transportation agencies inspect concrete bridge decks or tunnel linings. Developed through the SHRP2, these methods help to define the actual extent of deterioration—beyond what can be seen—for improved repairs and provide real-time solutions, saving transportation agencies time and money. 

Nondestructive Testing for Concrete Bridge Decks (R06A) includes a collection of geophysical technologies for evaluating and inspecting concrete bridge decks. The technologies include: Impact Echo (IE), Ultrasonic Surface Waves, Impulse Response, Ground-Penetrating Radar (GPR), Infrared Thermography Analysis, Electrical Resistivity, Galvanostatic Pulse, and Half-Cell Potential. A web-based evaluation 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. These technologies allow vehicles to drive through the tunnel and conduct the inspection without the need to close lanes. A user’s manual and guide for evaluating the best NDT technologies for specific situations is available, as well as a web-based evaluation tool to select appropriate NDT technologies for specific applications.

Nondestructive Testing to Identify Concrete Bridge Deck Deterioration TRB Report

Mapping Voids, Debonding, Delaminations, Moisture, and Other Defects Behind or Within Tunnel Linings TRB Report

Presentations and Webinars
  • SHRP2 R06A Nondestructive Testing for Concrete Bridge Decks Webinar, April 30, 2019 (Kathy Crowell, New Mexico DOT; Randy Strain, Indiana DOT; Corey Withroe Oregon DOT
Tools and Technologies
State Reports
Related Materials and Information
Implementation Assistance Program
  • Alabama, Arkansas, California, Delaware, Florida, Georgia, Hawaii, Indiana, Iowa, Kentucky, Louisiana, Missouri, Nebraska, New Mexico, New York, North Carolina, North Dakota, Oregon, Pennsylvania, and Virginia are implementing NDT for Concrete Bridge Decks as part of the Implementation Assistance Program.
  • California, Colorado and Oregon, Pennsylvania, and Virginia are currently implementing NDT for Tunnel Linings through the Implementation Assistance Program.
Related Links

The Virginia Department of Transportation demonstrates use of the MIRA system and handheld Spectral Analysis of Surface Waves bar paired with the NDE360 system.


Demonstrating Nondestructive Testing for Concrete Bridge Decks techniques.