Corrosion Mechanism of Steel Bars in Concrete Poles

Abstract

To clarify the corrosion mechanism of steel bars in concrete poles (CPs), the corrosion state of a steel bar that had been taken out of a discarded CP and a new steel bar that had been immersed in a quasi-concrete-environment (weak alkaline) solution were compared. The formation of rust was observed beneath the scale that covered the surface of the steel bar removed from the CP. A similar rust compound was observed in the bar immersed in the weak alkaline solution, which shows that the corrosion of a steel bar in a CP environment can be experimentally reproduced.