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Magnetic Sensor for Nondestructive Evaluation of Deteriorated Prestressing Strand

Wade, James David
http://rave.ohiolink.edu/etdc/view?acc_num=toledo1271287017

Abstract Details

2010, Master of Science in Civil Engineering, University of Toledo, Civil Engineering.
The objective of this thesis was to develop a non-destructive in-situ magnetic technique to investigate the remaining cross-sectional area of prestressing strands. Corrosion is the predominate failure-mechanism in box-beam bridges. The current method, visual inspection, is not sufficient as the strands may not be exposed to the investigator. An inaccurate estimate of the remaining area of strands can lead to an overestimated strength of the bridge. A new technique involving an electromagnet and magnetic theories was researched for this thesis. The experiments conducted have shown that it is possible to distinguish between different cross-sectional areas using an electromagnet and Hall sensors. Experiments with an air-gap were first used to simulate concrete cover and provide viability of the technique. These experiments showed that as the cross-sectional area increased so did the induced magnetic field. To further the research, concrete blocks were used in place of the air-gap to better simulate field conditions. Again, these experiments showed an increase in the induced magnetic field as the cross-sectional area was increased. Using the data from the air-gap and concrete block experiments, an approach to determine the cross-sectional area of a corroded strand under concrete cover was investigated.
Douglas Nims, PhD (Committee Chair)
Vijay Devabhaktuni, PhD (Committee Member)
Brian Randolph, PhD (Committee Member)
62 p.
Civil Engineering; Electromagnetism; Engineering; Transportation
Nondestructive testing; corrosion detection; prestressing strand; magnetic flux; electromagnet; cross-sectional area; bridge; concrete

Recommended Citations

Citations

  • Wade, J. D. (2010). Magnetic Sensor for Nondestructive Evaluation of Deteriorated Prestressing Strand [Master's thesis, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1271287017

    APA Style (7th edition)

  • Wade, James. Magnetic Sensor for Nondestructive Evaluation of Deteriorated Prestressing Strand. 2010. University of Toledo, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=toledo1271287017.

    MLA Style (8th edition)

  • Wade, James. "Magnetic Sensor for Nondestructive Evaluation of Deteriorated Prestressing Strand." Master's thesis, University of Toledo, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1271287017

    Chicago Manual of Style (17th edition)

toledo1271287017
601
© 2010, all rights reserved.
This open access ETD is published by University of Toledo and OhioLINK.