期刊
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
卷 14, 期 2, 页码 178-189出版社
SAGE PUBLICATIONS LTD
DOI: 10.1177/1475921714560070
关键词
Steel corrosion; long-period fiber gratings; nano iron particles; polyurethane
资金
- Mid-America Transportation Center [00026380]
- U.S. National Science Foundation [CMMI-1235202]
- US Department of Transportation Pipeline and Hazardous Materials Safety Administration [DTPH56-13-H-CAAP05]
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1235202] Funding Source: National Science Foundation
In this article, a recently proposed long-period fiber grating sensor coated with a thin layer of polyurethane and nano iron/silica particles is further developed and applied to monitor the corrosion process of deformed steel bars. Once calibrated, one coated long-period fiber grating sensor and one uncoated long-period fiber grating sensor for environmental compensation were attached to each of three steel bar samples that were tested in 3.5 wt% NaCl solution for 512h. The resonant wavelength in long-period fiber grating spectra increased exponentially with immersion time due to corrosion of iron particles and thus reduction in coating thickness. The mass loss rate of steel bar #1 at the completion of corrosion tests (512h of corrosion time) was correlated with that of sparse iron particles on long-period fiber grating sensor #1 after 130.5h of immersion. The corrosion rates of long-period fiber grating sensors #2 and #3 were evaluated at 130.5h and then used as a prediction of the corrosion rates of steel bars #2 and #3. The predicted corrosion rates by the long-period fiber grating sensors #2 and #3 were finally compared with those by potentiodynamic tests. The maximum mass loss prediction error by the long-period fiber grating sensors #2 and #3 is 26%. The coefficients of variation of three corrosion rate measurements are 0.049 by the long-period fiber grating sensors and 0.115 by the potentiodynamic tests, indicating more consistent and reliable measurements with the proposed technology.
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