Journal
SENSORS
Volume 15, Issue 4, Pages 8866-8883Publisher
MDPI
DOI: 10.3390/s150408866
Keywords
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Funding
- National Natural Science Foundation of China [51408544, 51408534, 51208459]
- Natural Science Foundation of Zhejiang Province [LQ14E080007]
- Natural Science Foundation of Ningbo [2013A610191]
- Science and Technology Service Project of Ningbo [2014F10016]
- Ningbo Scientific and Technological Innovation Team [2011B81005]
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Expansion and cracking induced by the corrosion of reinforcement concrete is the major factor in the failure of concrete durability. Therefore, monitoring of concrete cracking is critical for evaluating the safety of concrete structures. In this paper, we introduce a novel monitoring method combining Brillouin optical time domain analysis (BOTDA) and fiber Bragg grating (FBG), based on mechanical principles of concrete expansion cracking. BOTDA monitors concrete expansion and crack width, while FBG identifies the time and position of cracking. A water-pressure loading simulation test was carried out to determine the relationship between fiber strain, concrete expansion and crack width. An electrical accelerated corrosion test was also conducted to evaluate the ability of this novel sensor to monitor concrete cracking under practical conditions.
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