成果報告書詳細
管理番号20150000000461
タイトル*平成26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2015/7/18
報告書年度2014 - 2014
委託先名首都高技術株式会社 独立行政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・機械システム部
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) FY2014 Annual Report

A cement system such as mortar or concrete is damaged by seawater in the maritime area or anti-freezing agent in the snowy area. This is because water-soluble chloride is capable of leading to acceleration of the corrosion of metals embedded in a cement system as reinforcing bars. Therefore, its determination shall be required to anticipate the potential of a cement system for undergoing concrete deterioration or to investigate them where such reaction has already occurred.
We are making an attempt to develop the high-sensitive near-infrared spectrometer for investigating water-soluble chloride content from a distance. Although the main problem of remote spectroscopy in near-infrared region is insufficient light either for illumination or detection, we have invented the high-sensitive spectrometer to solve it.
National Institute of Advance Industrial Science and Technology (AIST), Fuji Electric Co., Ltd. (FE) and Sumitomo Electric Industries, Ltd.(SEI) developed the first prototype equipment for remote sensing, which are composed of optical setup developed by FE and camera system developed by SEI. FE designed a large-aperture and lossless optical system on the basis of optical throughput under technology transfer from AIST. SEI developed the area sensor used in near-infrared region. The light-receiving layer of the type-II InGaAs /GaAsSb quantum wells realized the low noise area sensor in comparison with the conventional HgCdTe sensors.
Test pieces were employed for checking the performance of the developing system. Tohoku University (Tohoku Univ.) and Shutoko Engineering Company, Ltd.(Shutoko Eng.) have contributed these parts by providing test pieces based on different standpoints. Tohoku Univ. has prepared the test pieces in the condition close to real environment. Two test conditions of the mortar pieces had been exposed under field environment for a maximum of two years; the maritime area and the snowy area. Shutoko Eng. has planned making the test pieces for estimating the quantitative performance of the developed system. The test pieces for use in laboratory were made to simulate the three different amount of water-soluble chloride which are 1.2 kg/m3, 5.0 kg/m3, 10.0 kg/m3. The test pieces of neutralized concrete were simulated under four conditions depending on the combination of blast-furnace slag (0%, 40%) and design strength (21 N/mm2, 30 N/mm2).
The bandwidth curve of the developed system is in near-infrared region between 1200 nm and 2350 nm in wavelength. Friedel's salt in the test mortar was measured obviously at around 2200-2300nm in wavelength and water was at around 1950 nm. Though the low-content pieces of water-soluble chloride did not show the absorption peak clearly, these are capable of distinguish by means of calculating the derivative spectra.
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