International state of practice in the inspection of grouted duct post-tensioned concrete bridge beams and decks

M. C. Forde, M. Ohtsu

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Post-Tensioned concrete bridges have been used for both rail and road bridges for some 40 years. Problems were first noticed with road bridges due to the use of de-icing salts. However there have been collapses of post-tensioned concrete railway bridges. Following this series of collapses, the Highways Agency enforced a ban on the construction of post-tensioned bridges with metallic tendon ducts. The moratorium was lifted with the introduction of plastic tendon ducts.

This paper will focus on the analysis of impact-echo NDT of concrete beams with plastic tendon ducts - using both a conventional frequency domain analysis and also using the Japanese SIBIE (Stack Imaging of Spectral Amplitudes Based on Impact-Echo) method. It will be shown that the SIBIE method of analysis exhibits great promise in testing these previously difficult to inspect plastic tendon ducts, using impact-echo.

Original languageEnglish
Title of host publicationInnovations in Bridge Engineering Technology
EditorsKM Mahmoud
Place of PublicationLONDON
PublisherTaylor & Francis
Number of pages13
ISBN (Print)978-0-415-45337-0
Publication statusPublished - 2007
EventInnovations in Bridge Engineering Technology - 4th New York City Bridge Conference 2007 - New York, NY, United Kingdom
Duration: 27 Aug 200728 Aug 2007


ConferenceInnovations in Bridge Engineering Technology - 4th New York City Bridge Conference 2007
CountryUnited Kingdom
CityNew York, NY

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