Abstract
Continuing from the former reports of the bond strength of the coated bars, this paper is intended to study the persistence of the steel bar coated with Zinc or Aluminium and embedded in the concrete. As the results of the outdoor exposure test, we find that the Zinc Coated bars have no corrosion on their surfaces in the plain concrete but they have some corrosion, white powder of ZnO in the concrete containing 2% calcum chloride. The aluminium coated bars have some corrosion in plain concrete, while corrosion of Al(OH)_3 and rust of FuO_2, but in the concrete containing calcium chloride, they have little corrosion.
