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Smart Structures and Systems Volume 18, Number 3, September 2016 , pages 405-423 DOI: https://doi.org/10.12989/sss.2016.18.3.405 |
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Concrete pavement monitoring with PPP-BOTDA distributed strain and crack sensors |
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Yi Bao, Fujian Tang, Yizheng Chen, Weina Meng, Ying Huang and Genda Chen
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| Abstract | ||
| In this study, the feasibility of using telecommunication single-mode optical fiber (SMF) as a distributed fiber optic strain and crack sensor was evaluated in concrete pavement monitoring. Tensile tests on various sensors indicated that the SMF-28e+ fiber revealed linear elastic behavior to rupture at approximately 26 N load and 2.6% strain. Six full-scale concrete panels were prepared and tested under truck and three-point loads to quantify the performance of sensors with pulse pre-pump Brillouin optical time domain analysis (PPP-BOTDA). The sensors were protected by precast mortar from brutal action during concrete casting. Once air-cured for 2 hours after initial setting, half a mortar cylinder of 12 mm in diameter ensured that the protected sensors remained functional during and after concrete casting. The strains measured from PPP-BOTDA with a sensitivity coefficient of 5.43 10-5 GHz/ were validated locally by commercial fiber Bragg grating (FBG) sensors. Unlike the point FBG sensors, the distributed PPP-BOTDA sensors can be utilized to effectively locate multiple cracks. Depending on their layout, the distributed sensors can provide one- or two-dimensional strain fields in pavement panels. The width of both micro and major cracks can be linearly related to the peak strain directly measured with the distributed fiber optic sensor. | ||
| Key Words | ||
| concrete pavement; crack detection; distributed fiber optic sensor; strain distribution; PPP-BOTDA | ||
| Address | ||
| Yi Bao, Fujian Tang, Yizheng Chen, Weina Meng and Genda Chen: 1Department of Civil, Architectural, and Environmental Engineering, Missouri University of Science and Technology, 1401 N. Pine Street, Rolla, MO 65409, USA Ying Huang: Department of Civil and Environmental Engineering, North Dakota State University, 1410 N. 14th Avenue, Fargo, ND 58105, USA | ||