| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2012: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Outline of Final Research Achievements |
The insufficient grouting defects have been detected on existing PC bridges subject to anti-freezing agents. Owing to the chloride ion invading from anchorage element, the corrosion of PC wire with the insufficient grouting occurs with pitting. And PC wire with pitting corrosion is feared to occur the brittle fracture due to stress concentration. However, the deterioration mechanism has not been clarified and the repair method has not been developed. In this study, based on Stress Corrosion Cracking (SCC) tests and Hydrogen Embrittlement Cracking tests of PC wires with pitting, the mechanism of brittle fracture was clarified. Then, this study focused on a repair method that uses a lithium nitrite (LiNO2)-containing solution and grout. The repair performance of the method including anti-macro-cell corrosion was verified. Finally, the repair method was applied to an existing bridges and the monitoring measurements were conducted and the repair effects were evaluated.
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