{"created":"2023-05-15T12:05:02.592910+00:00","id":9653,"links":{},"metadata":{"_buckets":{"deposit":"3610c9bc-a203-49ae-941a-20fb841fcc43"},"_deposit":{"created_by":3,"id":"9653","owners":[3],"pid":{"revision_id":0,"type":"depid","value":"9653"},"status":"published"},"_oai":{"id":"oai:iwate-u.repo.nii.ac.jp:00009653","sets":["1515:1516"]},"author_link":["73955","73956"],"item_28_alternative_title_23":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"Development of evaluation technology of corrosiveness in mortar based on magnetometry"}]},"item_28_biblio_info_7":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2007-05-01","bibliographicIssueDateType":"Issued"},"bibliographic_titles":[{}]}]},"item_28_date_6":{"attribute_name":"登録日","attribute_value_mlt":[{"subitem_date_issued_datetime":"2012-01-26"}]},"item_28_description_11":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"科学研究費補助金[基盤研究C](課題番号 16560623)研究成果報告書","subitem_description_type":"Abstract"}]},"item_28_description_12":{"attribute_name":"Abstract","attribute_value_mlt":[{"subitem_description":"コンクリート中の鉄筋の腐食問題に関連し、磁気計測に基づいてモルタル内の腐食環境を非接触で評価する新しい方法の開発をめざした。本法の原理は、鉄製の腐食プローブ(磁性腐食プローブ)をモルタル中に埋設し、その腐食開始を残留磁化の変化として検出することである。\n\n磁性腐食プローブの候補として鉄細線と鉄めっき膜を取り上げた。鉄線(Φ0.1mm)および鉄めっき(厚さ1,10μm)した銅棒(Φ10mm、長さ50mm)をモルタル内(40x40x160mm)に埋設し、モルタル試験片の外部より鉄プローブを磁化した後、残留磁化をSQUID磁束計で評価した。鉄プローブを埋設したモルタル試験片に対し、60℃のNaCl溶液に3日浸漬後60℃の乾燥器中で4日乾燥させる腐食加速試験を行った。\n\nモルタル中に埋設した鉄細線は腐食試験170日後も腐食しなかった。鉄細線とモルタルとの密着性が高く、周辺にミクロクラックが発生しなかったためと考えられた。また、鉄線ではモルタルの湿潤・乾燥に伴う収縮によって\"逆磁歪効果\"が起こり、腐食と無関係に残留磁化が周期的に変動した。\n\n鉄めっき膜をプローブとして使用した場合、腐食試験21目後には残留磁化が約1/4に減少した。破壊して内部を観察した結果、プローブの鉄めっき部が腐食していた。同様の腐食試験を行った鉄筋入りモルタルでも21日後に鉄筋に錆が発生していた。鉄めっきの膜厚を10μmにして同様の試験を行ったところ、残留磁化の絶対値が1μmの場合に比べて大きくなり、モルタル中の磁性不純物の影響が小さくできた。一方、腐食試験に対する残留磁化の変化速度は小さくなった。\n\n以上の結果から、鉄筋の腐食環境をモニタするために鉄めっき膜が適切であること、めっき厚さを変えることによって、腐食環境に対する感度を任意に制御できる可能性が示された。","subitem_description_type":"Other"},{"subitem_description":"A new-magnetic corrosion probe has been developed for nondestructive evaluation of concrete against corrosion of reinforcing bar. Two types of probes, a thin iron wire (probe A) and an iron-plated (1 μm thick) copper bar (probe B) were tested whether their changes in residual magnetization with progress of corrosion of iron could be detected using a superconducting interference device (SQUID) magnetometer. The preliminary tests carried out under an atmospheric condition showed that the residual magnetization became less intensive with progress of corrosion for both probes. Then the two types of probes were embedded in mortar for an accelerated corrosion test. The results showed that probe A scarcely corroded in mortar despite that reinforcing bar suffered from corrosion under the identical condition. The probe B corroded as reinforcing bar did, resulting in a sharp decrease in the residual magnetization. The magnetic corrosion probe B was further improved in terms of magnitude and stability of residual magnetization. A thicker (10 μm thick) probe was prepared successfully with a help of saccharin in an electroplating bath. The probe was heat treated before use in order to stabilize the residual magnetization. Then the probe was embedded in mortar for an accelerated corrosion test. The residual magnetization of the 10μm thick probe showed a slower change in comparison with 1 μm thick one. Therefore, the sensitivity of the probe against the corrosiveness can be adjusted by the thickness of plated iron. Thus, the developed probe embedded in mortar can give a magnetic warning against degradation of surroundings regarding the corrosion of reinforcing bar.","subitem_description_type":"Other"}]},"item_28_full_name_3":{"attribute_name":"著者別名","attribute_value_mlt":[{"nameIdentifiers":[{}],"names":[{"name":"YASHIRO, Hitoshi"}]}]},"item_28_text_4":{"attribute_name":"著者(機関)","attribute_value_mlt":[{"subitem_text_value":"岩手大学工学部"}]},"item_28_version_type_27":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_version_resource":"http://purl.org/coar/version/c_ab4af688f83e57aa","subitem_version_type":"AM"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"八代, 仁"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2016-11-14"}],"displaytype":"detail","filename":"kaken16560623.pdf","filesize":[{"value":"2.7 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"kaken16560623.pdf","url":"https://iwate-u.repo.nii.ac.jp/record/9653/files/kaken16560623.pdf"},"version_id":"215e9353-9746-4874-a8a1-6b43a17f166f"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"SQUID","subitem_subject_scheme":"Other"},{"subitem_subject":"concrete","subitem_subject_scheme":"Other"},{"subitem_subject":"corrosion","subitem_subject_scheme":"Other"},{"subitem_subject":"mortar","subitem_subject_scheme":"Other"},{"subitem_subject":"non-destructive evaluation","subitem_subject_scheme":"Other"},{"subitem_subject":"reinforcing bar","subitem_subject_scheme":"Other"},{"subitem_subject":"residual magnetization","subitem_subject_scheme":"Other"},{"subitem_subject":"コンクリート","subitem_subject_scheme":"Other"},{"subitem_subject":"モルタル","subitem_subject_scheme":"Other"},{"subitem_subject":"残留磁化","subitem_subject_scheme":"Other"},{"subitem_subject":"腐食","subitem_subject_scheme":"Other"},{"subitem_subject":"鉄筋","subitem_subject_scheme":"Other"},{"subitem_subject":"非破壊検査","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"research report","resourceuri":"http://purl.org/coar/resource_type/c_18ws"}]},"item_title":"磁気測定に基づくモルタル中の腐食環境評価技術の開発","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"磁気測定に基づくモルタル中の腐食環境評価技術の開発"}]},"item_type_id":"28","owner":"3","path":["1516"],"pubdate":{"attribute_name":"公開日","attribute_value":"2012-01-26"},"publish_date":"2012-01-26","publish_status":"0","recid":"9653","relation_version_is_last":true,"title":["磁気測定に基づくモルタル中の腐食環境評価技術の開発"],"weko_creator_id":"3","weko_shared_id":-1},"updated":"2023-05-16T11:00:52.085422+00:00"}