@article{oai:sucra.repo.nii.ac.jp:00016675,
 author = {睦好, 宏史 and 谷口, 博胤 and 今野, 洋一 and Ha, MINH and 二井谷, 教治},
 journal = {埼玉大学地域共同研究センター紀要, Report of Cooperative Research Center, Saitama University},
 month = {},
 note = {Problems with corrosion ofprestressing steel in post-tensioned structures due to inadequate grouting in the past have become more apparent in recent years. To investigate influence of inadequate grouting on corrosion ofprestressing steel, an accelerated corrosion tests by external current was carried out in this study. Further, loading tests were also conducted to investigate the behavior of post-tensioned concrete beams deteriorated by corrosion of prestressing steel. In the test, the grouts were injected into the ducts with different grout level of 33%, 66% and 100% respectively. The results of accelerated corrosion tests show that the cracks occurred faster with the increasing of grout level. It is confirmed that the grout plays a crucial role in the corrosion protection of the prestressing steel. The results of loading test show that, as the degree of corrosion crack became severe, failure mode of the beams shifted from flexural failure to bond splitting and ultimate loading capacity decreased from 10% to 30%. The reduction of the loading capacity might be due to reducing of steel-concrete bond and concrete rigidity by severe corrosion cracks. For the beam with applied current time of 30 days, the failure load decreased 82%. The weight loss of prestressing steel was 26% for this beam. It is concluded that adequate grouting is necessary to protect prestressing steel deteriorated by corrosion. Furthermore, since the corrosion cracks occurred faster if the rate of filling grout is high, the measuring of sheath's corrosion is needed., text, application/pdf},
 pages = {85--91},
 title = {PC鋼材の腐食によるプレストレストコンクリート橋梁の耐久性},
 volume = {3},
 year = {2003}
}