Title:
Detecting Delamination in Concrete
Bridge Decks
Author(s):
David G. Manning and Frank B. Holt
Publication:
Concrete International
Volume:
2
Issue:
11
Appears on pages(s):
34-41
Keywords:
bridge decks; bridges (structures); corro-sion;
deicers; deterioration; temperature measuring
instruments.
DOI:
Date:
11/1/1980
Abstract:
The corrosion-induced deterioration of concrete bridge decks is a serious problem in locations where deicing chemicals are used. The detection of subsur-face fracture planes, or delaminations, is necessary when determining the need or priority for repair and when preparing documents for a repair contract. The accuracy and appropriateness of manual methods of detecting delamination is compared with that of a commercial delamination detection device in wide-spread use. A single, heavy chain is a practical and efficient means of manually identifying delaminations. Infrared thermography has been found capable of detecting delamination because there is a difference in the surface temperature of sound and delaminated concrete under certain atmospheric conditions. The paper describes the equipment and the factors affecting the infrared imagery when used at ground level and from the air. The technique has the potential to become a routine operational procedure.