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WORK PACKAGE 9: PRACTICAL BRIDGE MANAGEMENT - page 47 / 67

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SAMCO Final Report 2006 F09 Report on Bridge Management

Types of NDT used

Visual inspection Cover-meter Potential mapping Corrosion rate Impact-echo Thermography Ambient vibration testing Dynamic testing Acoustic monitoring X-ray Schmidt-hammer Falling weight deflectometer Ground penetrating radar Test loading (dynamic and static)

Degree of success, from 0 (did not work) to 5 (perfect) 2-5 2-4 1-5 2-4 1-4 1-3 4 4 2 1-4 2-4 2 2-4 3-5

Ultrasonic testing Table 27. Experiences with the

4 use of NDT-methods in practise (reported success ranges).

The NDT-methods can yield very valuable information about the conditions at the time of inspection, however, the future growth in the damage, the chloride ingress etc. requires a more continuous monitoring. The end-users were therefore asked to describe their motivation for using monitoring and how they would rate the need for such monitoring.

The priorities differed again from one end-user to another, depending on their needs, but an overview of the results in the questionnaires is shown in Table 28.

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