Non-destructive testing in bridge diagnostics: conclusions after 15 years of practice

Abstract

Non-destructive testing is an indirect method that does not permanently damage or alter the properties of the structure under inspection. The UACh Laboratorio de Ingeniería de Puentes has performed more than 750 of these tests on Chilean bridges since 2012. The most commonly used tests have been the concrete rebound hammer, carbonation depth, rebar detector, ultrasonic concrete quality, in situ Brinell hardness, and the Impact-Echo test. Based on this experience, it is concluded, among others, that the rebound hammer, carbonation, and ultrasonic tests on concrete structures should always be performed as a trio. Furthermore, both tests are required to assess the remaining service life: carbonation and rebar detector measurement of the cover. Finally, it is noted that the Chilean Highway Administration is increasingly requesting non-destructive tests per bridge, thus giving greater importance to their results.