INFLUENCE OF GROUTING CONDITIONS ON THE DETERIORATION OF POST-TENSIONED CONCRETE BRIDGES

摘要

Chloride-induced corrosions of a sheath and a prestressing tendon in post-tensioned prestressed concrete (PC) beams are investigated under different grouting conditions. Two series PC beams were tested by the electrically accelerated corrosion. The first series of accelerated corrosion tests were performed to determine the influence of grouted ratios in a sheath on the corrosion of the sheath and the prestressing tendon. In the second series of tests, the relationship between corrosion crack and expansive pressure surrounding the sheath and tendon during the corrosion process was clarified.