TY - JOUR
T1 - Monitoring corrosion of steel bars in reinforced concrete based on helix strains measured from a distributed fiber optic sensor
AU - Fan, Liang
AU - Tan, Xiao
AU - Zhang, Qinghua
AU - Meng, Weina
AU - Chen, Genda
AU - Bao, Yi
N1 - Publisher Copyright:
© 2019 Elsevier Ltd
PY - 2020/2/1
Y1 - 2020/2/1
N2 - Corrosion of steel bars compromises the safety and service life of reinforced concrete structures. This study develops an in-situ corrosion monitoring method for reinforced concrete with a distributed fiber optic sensor through experimentation. Reinforced concrete beams instrumented with distributed fiber optic sensors were prepared. A constant current was impressed to the beams immersed in a NaCl solution for accelerated corrosion. The distributed fiber optic sensor was deployed in a helix pattern on the steel bar to measure expansive strains generated by corrosion of the steel bar. The corrosion process of the steel bar was assessed in an electrochemical test. The strain measured from the sensor was utilized to evaluate the volume of the corrosion products surrounding the steel bars and predict the cracking of the concrete cover. To investigate the deterioration process of reinforced concrete, different levels of concrete cover thickness (28 mm, 35 mm, and 43 mm) and water-to-cement ratio (0.4, 0.5, and 0.6) were studied. The relationship between the mass loss of steel bars and the volume of corrosion products is established to provide a method for evaluating the effects of steel corrosion on the deterioration of reinforced concrete.
AB - Corrosion of steel bars compromises the safety and service life of reinforced concrete structures. This study develops an in-situ corrosion monitoring method for reinforced concrete with a distributed fiber optic sensor through experimentation. Reinforced concrete beams instrumented with distributed fiber optic sensors were prepared. A constant current was impressed to the beams immersed in a NaCl solution for accelerated corrosion. The distributed fiber optic sensor was deployed in a helix pattern on the steel bar to measure expansive strains generated by corrosion of the steel bar. The corrosion process of the steel bar was assessed in an electrochemical test. The strain measured from the sensor was utilized to evaluate the volume of the corrosion products surrounding the steel bars and predict the cracking of the concrete cover. To investigate the deterioration process of reinforced concrete, different levels of concrete cover thickness (28 mm, 35 mm, and 43 mm) and water-to-cement ratio (0.4, 0.5, and 0.6) were studied. The relationship between the mass loss of steel bars and the volume of corrosion products is established to provide a method for evaluating the effects of steel corrosion on the deterioration of reinforced concrete.
KW - Corrosion
KW - Crack
KW - Distributed fiber optic sensors
KW - In-situ condition assessment
KW - Interactive defects
KW - Mass loss
KW - Reinforced concrete
KW - Steel–concrete interface
KW - Structural health monitoring
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U2 - 10.1016/j.engstruct.2019.110039
DO - 10.1016/j.engstruct.2019.110039
M3 - Article
AN - SCOPUS:85076239036
SN - 0141-0296
VL - 204
JO - Engineering Structures
JF - Engineering Structures
M1 - 110039
ER -