Detecting the Defects

by Gary Weil, President; Entech Engineering,

Serial Information: Civil Engineering—ASCE, 1989, Vol. 59, Issue 9, Pg. 74-77

Document Type: Feature article


According to estimates, for every dollar spent on preventive maintenance of the infrastructure, $10 will be saved by avoiding emergency repairs after major structural failures. Technologies must be developed to help inspectors detect voids while they're small and less expensive to repair. Infrared thermography is one of the many non-destructive testing techniques being used. In field test on sewers, roads, bridges and airport taxiways, engineers have used high resolution, scanning systems to measure thousands of surface temperatures simultaneously. Engineers are then able to detect voids and utility leaks.

Subject Headings: Defects and imperfections | Voids | Imaging techniques | Field tests | Bridge tests | Temperature measurement | Maintenance | Infrastructure

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