Abstract
In this paper, a novel sensing technique has been designed and investigated for the direct,
in situ detection of steel corrosion distributed in reinforced concrete
structures. At present, structural health monitoring in reinforced concrete structures is generally focused on
monitoring the corrosion risk of the reinforcing steel. It is of significant importance, however, to inform industry
of both the onset of corrosion and the corrosion rate as these are key contributors to structural degradation and thus
evaluating the service life of the structures. This paper aims to address the above challenges by describing a novel
corrosion sensor design using birefringent photonic crystal fibres. The technique exploits fully both the
birefringence of the fibres for force/pressure measurement and their very low temperature sensitivity to detect the
onset of corrosion. This new type of sensor not only determines the onset of corrosion but also allows for better
monitoring along the length of a reinforcement bar.
© 2013 IEEE
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