Preservation of Missouri Transportation Infrastructures: Life-Cycle Inspection and Monitoring of FRP-Strengthened Concrete Structures Using Near-Field Microwave Nondestructive Testing Methods

Kharkovsky, S.; Stephen, V.; Ryley, A. C.; Robbins, J. T.; Zoughi, Reza; Missouri University of Science and Technology; Missouri University of Science and Technology. Center for Infrastructure Engineering Studies

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Preservation of Missouri Transportation Infrastructures: Life-Cycle Inspection and Monitoring of FRP-Strengthened Concrete Structures Using Near-Field Microwave Nondestructive Testing Methods

2008-07-01
By Kharkovsky, S. ; Stephen, V. ; Ryley, A. C. ; ...

[PDF-3.96 MB]

English

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Creators:

Kharkovsky, S. ; Stephen, V. ; Ryley, A. C. ; Robbins, J. T. ; Zoughi, Reza

Kharkovsky, S. ; Stephen, V. ; Ryley, A. C. ; Robbins, J. T. ; Zoughi, Reza Less -
Corporate Creators:

Missouri University of Science and Technology ; Missouri University of Science and Technology. Center for Infrastructure Engineering Studies

Missouri University of Science and Technology ; Missouri University of Science and Technology. Center for Infrastructure Engineering Studies Less -
Corporate Contributors:

Missouri. Department of Transportation ; United States. Department of Transportation. Research and Special Programs Administration

Missouri. Department of Transportation ; United States. Department of Transportation. Research and Special Programs Administration Less -
Subject/TRT Terms:

[+]

Carbon Fibers Composite Structures Debonding Fiber Reinforced Plastics Laboratory Tests Microwave Devices
Publication/ Report Number:

UTC R97;RG001232
Resource Type:

Tech Report
Geographical Coverage:

Missouri;United States
TRIS Online Accession Number:

01110684
Edition:

Final Report
Corporate Publisher:

Missouri. Department of Transportation
Abstract:

Defects in the form of dis-bonds and delaminations in CFRP-strengthened composite structures can significantly reduce their strengthening effectiveness. It is of great interest to develop a one-sided, non-contact, realtime, fast, robust, inexpensive and portable inspection system capable of detecting such disbonds and evaluating their properties such as spatial extent. Microwave non-invasive inspection methods are a viable candidate for lifecycle inspection of the CFRP-strengthened concrete structures. In this report, a novel near-field microwave inspection system consisting of a dual-polarized open-ended square waveguide probe was designed and built for this purpose. This system incorporated the anisotropic nature of unidirectional CFRP laminates by simultaneously producing two orthogonally-polarized images and compensating for real-time variations in standoff distance. The system was extensively tested in the laboratory and finally on Bridge P-0962, located in Dallas County, Missouri, whose members were strengthened with CFRP patches. The results clearly illustrated the utility of this system for this type of inspection. The microwave images produced using this system, provided for a close estimate of the dimensions of disbonded regions. The system is a one-sided, non-contact, small, robust, real-time and inexpensive and provides for a significant amount of useful information about the nature of an anomaly (e.g., size, location, etc.) without the need for complex image processing.
Format:

PDF
Alternate URL:

http://utc.mst.edu/documents/R97_CR.pdf
Funding:

DTRS98-G-0021
Collection(s):

University Transportation Centers US Transportation Collection
Main Document Checksum:

[+]

urn:sha256:8099bc3991fe8f34219ce96ad292eee4475a3e9abcce78eb6761eee372a09295
Download URL:

https://rosap.ntl.bts.gov/view/dot/43648/dot_43648_DS1.pdf
File Type:

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Preservation of Missouri Transportation Infrastructures: Life-Cycle Inspection and Monitoring of FRP-Strengthened Concrete Structures Using Near-Field Microwave Nondestructive Testing Methods

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