| Budget Amount *help |
¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2017: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2015: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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| Outline of Final Research Achievements |
To properly maintain and manage weathering steel bridges and to prolong the life, it is necessary to establish the rust evaluation method which was generated on surface of steel, the subsequent rust development prediction method and effective repair technique. In this study, the early rust growth generated by salt water on weathering steel was modeled. We also formulated the water absorption behavior due to the deliquescence of sodium chloride.
In repairing corroded weathering steel, it is necessary to remove the salt on steel surface. Therefore, in this study, attempt was made to remove the intrinsic salt content by sodium carbonate. From the result of the exposure test, no remarkable re-corrosion was observed, and it is considered that the intrinsic salt content could be removed to some extent.
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