ABSTRACT
Currently, many prestressed concrete (PC) bridges in Japan have been identified as defective. The main cause of deterioration in most of the post-tensioned PC bridges having internal tendons is corrosion of the tendons due to insufficient grout filling inside the sheath or due to chloride ion attack. In this study, flexural capacity of post-tensioned PC beams having ruptured tendons and the influence of grout refilling are studied. Large-scale beam flexural tests were carried out on the post-tensioned PC beams having internal tendons. The effect of grout re-injection on the flexural capacity was investigated by re-grouting the sheath after cutting tendons. The test results showed that the grouting condition significantly affects the ultimate load carrying capacity of the PC beams. After re-injection of grout, the flexural capacity of the PC beams increased due to recovery of bonding between the tendon and grout. However, the recovery of bonding depends on the length of the un-grouted or partially grouted zone.
