The Scientific World Journal / 2014 / Article / Tab 1

Review Article

Monitoring Corrosion of Steel Bars in Reinforced Concrete Structures

Table 1

Methods for evaluating corrosion in concrete structures [5].

S. no.MethodAdvantagesLimitationsPrinciple

1Galvanostatic pulse method Measures half-cell potential and electrical resistance simultaneouslyUnstabilized readingsBased on the polarization of rebar by means of small constant current
2Linear polarization resistance (LPR)Rapid and requires only localized damage, more detailed informationMeasurements are affected by temperature and humidityElectrical conductivity of fluid can be related to its corrosiveness
3Half-cell potentialSimple, portable, results in the form of equipotential contoursNeeds preparation, saturation required, not very accurate, and time consumingElectric potential of rebars is measured relative to half-cell and indicates probability of corrosion
4Time domain reflectometry (TDR)More robust, easy, and locates corrosion and identifies extent of damageLess sensitiveBy applying a sensor wire alongside of the reinforcement a transmission line is created. Physical defects of the reinforcement will change the electromagnetic properties of the line
5Ultrasonic guided wavesIdentify location and magnitude of corrosionNot very reliableBased on propagation of ultrasonic waves
6X-ray diffraction and atomic absorptionSimple and reliableHazardousIntensity of X-ray beams reduces while passing through a material

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