Advancement of high precision corrosion evaluation method by proposing electric equivalent circuit based on corrosion mechanism
Project/Area Number |
17K14712
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Research Category |
Grant-in-Aid for Young Scientists (B)
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Allocation Type | Multi-year Fund |
Research Field |
Civil engineering materials/Construction/Construction management
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Research Institution | National Institute of Maritime, Port and Aviation Technology |
Principal Investigator |
SOMEYA Nozomu 国立研究開発法人海上・港湾・航空技術研究所, 港湾空港技術研究所, 研究官 (80779447)
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Project Period (FY) |
2017-04-01 – 2019-03-31
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Project Status |
Completed (Fiscal Year 2018)
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Budget Amount *help |
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2018: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2017: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
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Keywords | 電気化学インピーダンス法 / モルタル / 容量性半円 / 細孔構造 / 鉄筋コンクリート / 電気的等価回路 / 鋼材腐食 / かぶり |
Outline of Final Research Achievements |
An electrochemical impedance measurement of mortar specimen was performed to investigate the relationship between the impedance spectrum and the pore structure in mortar. The mortar specimens with different pore size were prepared for the impedance measurement. The capacitive loop or part of loop, which are related to the physical properties of mortar, were observed in the impedance spectra of mortar specimens. The mortar resistance between the pores and the capacitance between pores filled with solution in mortar specimen (RMpore and CMpore) were estimated by curve-fitting of impedance spectrum using an equivalent circuit. The values of RMpore and CMpore were increased and decreased, respectively, when the size of pores became smaller in mortar specimens. These results imply the decreasing the water pathway of pores in mortar due to the increasing small pores in mortar.
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Academic Significance and Societal Importance of the Research Achievements |
鉄筋コンクリート構造物中の鋼材腐食の状態を把握する代表的な手法に,自然電位法と電気化学インピーダンス法がある.これらは,かぶり(鉄筋との間のコンクリート)を介した計測が一般的であるため,計測結果はかぶりの影響によって真値とは異なることが報告されている. そこで本検討では,かぶりの諸特性が計測結果に及ぼす影響を定量的に理解することを目的とし,コンクリート中を模擬した検討を実施することで,かぶりによって生じる電位差や,電気化学インピーダンス法の分析に用いる電気的等価回路を提案した.
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Report
(3 results)
Research Products
(4 results)