{"created":"2023-06-19T10:26:55.132107+00:00","id":5666,"links":{},"metadata":{"_buckets":{"deposit":"6184e151-c69a-407a-802b-780f94ec33ba"},"_deposit":{"created_by":18,"id":"5666","owners":[18],"pid":{"revision_id":0,"type":"depid","value":"5666"},"status":"published"},"_oai":{"id":"oai:muroran-it.repo.nii.ac.jp:00005666","sets":["216:218","46"]},"author_link":["8780","6368"],"item_79_biblio_info_10":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1997-06","bibliographicIssueDateType":"Issued"},"bibliographicIssueNumber":"1","bibliographicPageEnd":"846","bibliographicPageStart":"841","bibliographicVolumeNumber":"19","bibliographic_titles":[{"bibliographic_title":"コンクリート工学年次論文報告集","bibliographic_titleLang":"ja"}]}]},"item_79_description_23":{"attribute_name":"フォーマット","attribute_value_mlt":[{"subitem_description":"application/pdf","subitem_description_type":"Other"}]},"item_79_description_7":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"約70年間海中にあった防波堤ケーソン壁の鉄筋コンクリートを採取し、中の鉄筋の腐食を調べた。観察およびX線回折による検討の結果、Magnetiteを主成分とする黒錆の均一腐食のほか、GoethiteやAkaganiteの黄褐色錆が鉄筋表面積の約15%存在する程度で、鉄筋の腐食重量減少率も1%程度であった。腐食に関わるコンクリート中の塩化物イオン含有量は6kg/m^3と多かったが、中性化は殆ど進行しておらず、コンクリートのpH値は表面でも11以上あり減少は少なく、表面から50mm深さでは12以上であった。","subitem_description_language":"ja","subitem_description_type":"Abstract"}]},"item_79_link_5":{"attribute_name":"室蘭工業大学研究者データベースへのリンク","attribute_value_mlt":[{"subitem_link_text":"菅田 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