United States Department of Transportation
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Comprehensive bridge deck deterioration mapping of nine bridges by nondestructive evaluation technologies.
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2011-01-01
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[PDF-24.32 MB]
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Edition:Final report.
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Abstract:The primary objective of this research was to demonstrate the benefits of NDT technologies for effectively detecting
and characterizing deterioration in bridge decks. In particular, the objectives were to demonstrate the capabilities of
ground-penetrating radar (GPR) and impact echo (IE), and to evaluate and describe the condition of nine bridge
decks proposed by Iowa DOT. The first part of the report provides a detailed review of the most important
deterioration processes in concrete decks, followed by a discussion of the five NDT technologies utilized in this
project. In addition to GPR and IE methods, three other technologies were utilized, namely: half-cell (HC) potential,
electrical resistivity (ER), and ultrasonic surface waves (USW) method. The review includes a description of the
principles of operation, field implementation, data analysis, and interpretation; information regarding their
advantages and limitations in bridge deck evaluations and condition monitoring are also implicitly provided.. The
second part of the report provides descriptions and bridge deck evaluation results from the nine bridges. The results
of the NDT surveys are described in terms of condition assessment maps and are compared with the observations
obtained from the recovered cores or conducted bridge deck rehabilitation. Results from this study confirm that the
used technologies can provide detailed and accurate information about a certain type of deterioration, electrochemical
environment, or defect. However, they also show that a comprehensive condition assessment of bridge decks can be
achieved only through a complementary use of multiple technologies at this stage,. Recommendations are provided
for the optimum implementation of NDT technologies for the condition assessment and monitoring of bridge decks.
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