EVALUATION ON PROPERTIES OF CONCRETE AND STEEL IN PC BRIDGE GIRDERS SEVERELY DAMAGED BY CHLORIDE INDUCED DETERIORATION

Abstract

  First, in PC bridge girders severely damaged by chloride induced deterioration on the Japan Sea Shore in Aomori, the field inspection was performed. Next, using concrete cores sampled from the blocks of girders, the compressive strength, Young’s modulus, carbonation depth, and chloride ion concentration of concrete were measured. Additionally, by removing whole concrete from blocks, the corrosion condition of steel inside was observed. After measuring the mass loss of steel due to corrosion, the load-elongation relation of steel was examined. From the results of these inspections and experiments, it was recognized that this bridge was exposed to an extremely severe corrosive environment. Further, the influence of various factors on the corrosion of steel, and the relation between mechanical properties of steel and its mass loss due to corrosion were revealed.