Maintainance and planning of the restoration work on reinforced concrete structures need a rapid, non-destructive inspection technique that detects corrosion at an early stage. The results of potential surveys on several bridge decks of the Swiss highways, realized with a new computer controlled eight-wheel measurement system, are presented. It is clearly shown that a fixed potential value (as proposed in ASTM C 876-80) for the identification and location of active corrosion of steel in concrete does not exist. A very rapid new technique using galvanostatic pulse measurements was tested successfully on site. It gives clear, unambiguous results on the corrosion state of the rebars when half-cell potentials are uncertain. In addition, the concrete resistivity and the corrosion rate of the rebars may be estimated simultaneously.
Corrosion Monitoring of Steel in Concrete--Theory and Practice
ELSENER, BERNHARD;
1990-01-01
Abstract
Maintainance and planning of the restoration work on reinforced concrete structures need a rapid, non-destructive inspection technique that detects corrosion at an early stage. The results of potential surveys on several bridge decks of the Swiss highways, realized with a new computer controlled eight-wheel measurement system, are presented. It is clearly shown that a fixed potential value (as proposed in ASTM C 876-80) for the identification and location of active corrosion of steel in concrete does not exist. A very rapid new technique using galvanostatic pulse measurements was tested successfully on site. It gives clear, unambiguous results on the corrosion state of the rebars when half-cell potentials are uncertain. In addition, the concrete resistivity and the corrosion rate of the rebars may be estimated simultaneously.
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