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Main Cable Dehumidification of The Anthony Wayne Bridge

Ojha, Rabin Prasad
http://rave.ohiolink.edu/etdc/view?acc_num=toledo1576253431551772

Abstract Details

2019, Master of Science, University of Toledo, Civil Engineering.
This thesis validates the use of Analatom AN110 corrosion sensors and the dehumidification system in the main cables of The Anthony Wayne Bridge over Maumee River in Toledo, Ohio, to keep the relative humidity at a level in which corrosion cannot occur. The 88 years old bridge has been subjected to several rehabilitation projects to control corrosion, as well as to extend its life cycle. The acoustic emission monitoring system was installed in 2011 to detect potential locations of corrosion, but no such signals were detected. Internal inspections done by Modjeski and Masters, Inc. at two locations on each cable revealed severe corrosion and subsequently urged Ohio Department of Transportation (ODOT) to find promising technology, such as a dehumidification system, to prevent corrosion. Previous research and inspections revealed that, even with improved wrapping and painting, it was impossible to make cables completely watertight, which led researchers to find a system that can protect cables by controlling humidity. Main cable dehumidification involves injecting dry air into the cable environment which then collects moisture, releasing it through exhaust, thereby reducing relative humidity and controlling corrosion.This system is also considered the most cost-effective approach in prolonging the life cycle of the suspension bridges. In this thesis, an extensive review of literature about cable dehumidification and examples of past applications of this system in bridges is presented, along with the application of Linear Polarization Resistance (LPR) technology, laboratory testing of Analatom AN110 corrosion sensors, and dehumidification systems. An environmental chamber with an aluminum duct was created inside the laboratory to simulate the condition of the main cables. AN110 corrosion sensors used LPR technology to measure corrosion rate and relative humidity in real-time, and the data was retrieved with the help of the Data Acquisition System. The first test was performed inside the laboratory, whereas the other four tests were performed outside the laboratory to investigate the effectiveness of the dehumidification system in the outside environment. The data obtained validated the use of the dehumidification system in controlling corrosion of the main cables of The Anthony Wayne Bridge and is recommended as an efficient and inexpensive method.
Douglas Nims (Advisor)
Mark Pickett (Committee Member)
Alex Spivak (Committee Member)
65 p.
Civil Engineering
dehumidification; suspension bridge

Recommended Citations

Citations

  • Ojha, R. P. (2019). Main Cable Dehumidification of The Anthony Wayne Bridge [Master's thesis, University of Toledo]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1576253431551772

    APA Style (7th edition)

  • Ojha, Rabin. Main Cable Dehumidification of The Anthony Wayne Bridge. 2019. University of Toledo, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=toledo1576253431551772.

    MLA Style (8th edition)

  • Ojha, Rabin. "Main Cable Dehumidification of The Anthony Wayne Bridge." Master's thesis, University of Toledo, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1576253431551772

    Chicago Manual of Style (17th edition)

toledo1576253431551772
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This open access ETD is published by University of Toledo and OhioLINK.