成果報告書詳細
管理番号20160000000487
タイトル*平成27年度中間年報 SIP(戦略的イノベーション創造プログラム)/インフラ維持管理・更新・マネジメント技術 点検・診断技術の実用化に向けた研究開発 高感度近赤外分光を用いたインフラの遠隔診断技術の研究開発
公開日2016/7/22
報告書年度2015 - 2015
委託先名首都高技術株式会社 国立研究開発法人産業技術総合研究所 富士電機株式会社 住友電気工業株式会社 国立大学法人東北大学
プロジェクト番号P14031
部署名ロボット・AI部
和文要約
英文要約Title: Cross-ministerial strategic innovation promotion program for Technologies for maintenance/upgrading/management of infrastructures for Developing low-cost operation and maintenance system on Remote monitoring of concrete structure with the high-sensitive near-infrared spectroscopy (FY2014-FY2016) FY2015 Annual Report

The life of concrete structure depends on the life of layer of reinforcing bars applied over the reinforced concrete. The corrosion behavior of reinforcing bars could be estimated mainly by the amount of water and chloride and by the neutralization of compounds. As these components accelerate the corrosion of metals embedded in a cement system, its determination shall be required to anticipate the potential of a cement system for undergoing concrete deterioration. To monitor deterioration factors from a distance, we are developing the high-sensitive near-infrared spectrometer. Although the main problem of remote spectroscopy in near-infrared (NIR) region is insufficient light either for illumination or detection, we have invented the high-sensitive spectrometer to solve it.
Fuji Electric Co., Ltd. (FE) and Sumitomo Electric Industries, Ltd.(SEI) have developed the first practical equipment based on the setup for laboratory use which was developed by National Institute of Advance Industrial Science and Technology (AIST). FE buit a large-aperture interferometer to improve the optical throughput for outdoor use. The problem of multiple reflection light was solved by the design of optical setup to keep out the stray light. SEI developed the high quality area sensor in near-infrared region. SEI improved the anti-reflection measure with applying masking material to the wiring part of sensor. These developed components were assembled to build the NIR spectrometer of second trial model for outdoor use. The performance was recognized to exceed the project outcome in which the absorption spectra of the concrete wall could be measured one meter apart from it. The performance of the system have been tested frequently with the test pieces provided by Tohoku University (Tohoku Univ.) and Shutoko Engineering Company, Ltd. (Shutoko Eng.). Tohoku Univ. has prepared principal pure materials contained in deteriorated concrete or cement hydration to identify their spectra in near infrared region. As one result, it is recognized that Friedel's salt has the absorption around 1900 nm besides the formerly well-known 2250 nm. Shutoko Eng. made the test pieces for estimating the quantitative performance of the developed system. The test pieces were made to simulate the different amount of water-soluble chloride which are between 0.0 kg/m3 to 40.0 kg/m3.
Multicomponent analysis was applied to the NIR spectra to estimate the amount of water in various test pieces including salt damage and neutralized cement. It was proved to have a high correlation with the commercially avairable concrete moisture meter. Further, the spectral transmission characteristics in NIR region of test mortar were examined to confirm the technical prediction extrapolated from visible light. The absorption coefficient was estimated to be 1.2 per a millimeter, which means that the penetration depth of NIR light for mortar is 0.36 mm.
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