Monitoring corrosion of steel bars in reinforced concrete based on helix strains measured from a distributed fiber optic sensor

2020 ◽  
Vol 204 ◽  
pp. 110039 ◽  
Author(s):  
Liang Fan ◽  
Xiao Tan ◽  
Qinghua Zhang ◽  
Weina Meng ◽  
Genda Chen ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Fiber Optic ◽  
Fiber Optic Sensor ◽  
Optic Sensor ◽  
Steel Bars ◽  
Distributed Fiber Optic Sensor ◽  
Corrosion Of Steel

scholarly journals Feasibility of Distributed Fiber Optic Sensor for Corrosion Monitoring of Steel Bars in Reinforced Concrete

Sensors ◽  
2018 ◽  
Vol 18 (11) ◽  
pp. 3722 ◽  
Author(s):  
Liang Fan ◽  
Yi Bao ◽  
Genda Chen
Keyword(s):  
Corrosion Resistance ◽  
Reinforced Concrete ◽  
Bond Strength ◽  
Fiber Optic ◽  
Fiber Optic Sensor ◽  
Corrosion Monitoring ◽  
Distributed Sensor ◽  
Optic Sensor ◽  
Steel Bars ◽  
Distributed Fiber Optic Sensor

This study investigates the feasibility of distributed fiber optic sensor for corrosion monitoring of steel bars embedded in concrete. Two sensor installation methods are compared: (1) attaching the sensor along the bar and (2) winding the sensor on the bar. For the second method, optical fibers were winded spirally on steel bars with different spacings: 0 mm, 2 mm, 5 mm, and 10 mm. Steel bar pull-out testing was conducted to evaluate the effect of presence of distributed sensor on the bond strength of steel–concrete interface. Electrochemical testing was carried out to assess the influence of the installation methods on the corrosion resistance of the reinforced concrete. Winding the optical fiber on steel bars with a 10-mm spacing does not affect the bond strength and corrosion resistance and allows real-time corrosion monitoring. The distributed sensor data can be used to estimate the corrosion induced steel loss and predict concrete cracking.

Disturbance Detection in Distributed Fiber-Optic Sensor Based on Time-Delay Estimation

2010 ◽  
Vol 30 (6) ◽  
pp. 1603-1607 ◽  
Author(s):  
许海燕 Xu Haiyan ◽  
徐锲 Xu Qie ◽  
肖倩 Xiao Qian ◽  
张毅 Zhang Yi ◽  
贾波 Jia Bo
Keyword(s):  
Time Delay ◽  
Fiber Optic ◽  
Time Delay Estimation ◽  
Fiber Optic Sensor ◽  
Delay Estimation ◽  
Optic Sensor ◽  
Distributed Fiber Optic Sensor ◽  
Disturbance Detection

High Spatial Resolution Crack Monitoring in Concrete Structures Using a Distributed Fiber Optic Sensor

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Kevin (Wenhai) Li ◽  
Michel Gaudet
Keyword(s):  
Spatial Resolution ◽  
Fiber Optic ◽  
High Spatial Resolution ◽  
Early Stage ◽  
Large Strain ◽  
Fiber Optic Sensor ◽  
Crack Location ◽  
Four Point Bending ◽  
Optic Sensor ◽  
Distributed Fiber Optic Sensor

Abstract A method to monitor the mechanical behavior and identify crack location and growth in a concrete structure element using a distributed fiber optic sensor (FOS) system is demonstrated experimentally by testing concrete specimens in four-point bending. The sensor system consisted of an optical frequency domain reflectometry (OFDR) interrogator unit paired with an all-grating sensing fiber that was bonded to the surface of the concrete test specimen. Strain measurements with high spatial resolution of <10 mm were obtained at various points along a single fiber cable. Large strain values at the crack locations indicated strain concentrations that could be used to assess the crack growth. The distributed sensing system demonstrated the capability to detect localized, early stage cracks, with crack width smaller than 0.1 mm, well before they become observable by visual inspection.

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