We've read about using chain drags or striking concrete surfaces with a hammer to detect delaminations. Is there a standard procedure for using either of these methods?
The equipment and procedures used to detect delaminations are described in ASTM D 4580, "Test Method for Measuring Delaminations in Concrete Bridge Decks by Sounding." Procedures for using both chain drags and an electro-mechanical sounding device are covered. You can order a copy of the test method from ASTM, 100 Barr Harbor Dr., West Conshohocken, PA 19428 (610-832-9585).