Sonic NDE of Structural Concreteby Larry D. Olson, Olson Engineering, Inc, Lakewood, United States,
Abstract: Case histories are presented to illustrate applications of nondestructive evaluation (NDE) methods that use stress waves to characterize the conditions of concrete construction. The case histories discuss the following NDE methods and applications: 1. Impact Echo to evaluate cracking in a 1923 thin-arch concrete dam on the downstream face; 2. Impact Echo to investigate honeycomb and void conditions, and to provide quality assurance of repairs to a box girder bridge; and 3. Ultrasonic Pulse Velocity to define the severity of cracking damage in pre-cast bridge segments and for quality assurance of epoxy injection repairs. Comparisons of NDE results with destructive coring and known conditions show the NDE methods accurately defined the extent and nature of sound and defective concrete conditions.
Subject Headings: Concrete | Case studies | Stress waves | Cracking | Concrete dams | Quality control | Rehabilitation
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