| Title |
Environmental Influences and Assesment of Corrosion Rate of Reinforcing Bars using the Liner Polarization Resistance Technique |
| Keywords |
Polarization Resistance ; Corrosion Rate ; Environmental Condition ; Temperature ; Rainfall |
| Abstract |
The purpose of this study was to investigate the influence of a single liner polarization resistance measurement to ambient environmental conditions. The liner polarization resistance method was used for the measurement of corrosion rate on externally exposed reinforced concrete in the UK. LPR measurements were taken on several bars to identify one with a high rate of corrosion above 1.0 μA/cm2 and one with a low/passive rate of corrosion below 0.1 μA/cm2.
The results has shown that both the ambient temperature and the rainfall can have a significant influence on the instantaneous rate of corrosion using the liner polarization resistance measurements. It would be unwise to rely on a single field measurement to predict the future behaviour of a structure at corrosion risk. Corrosion of reinforcing bars is a dynamic process which may fluctuate with changes in the ambient environmental conditions. A corrosion rate measurement on one occasion may not give a representative evaluation of the severity of corrosion problem over an extended period. The best approach would be to integrate a series of corrosion rate measurements taken at regular intervals over an extended period of time. |