{"created":"2023-07-27T06:55:16.207983+00:00","id":51042,"links":{},"metadata":{"_buckets":{"deposit":"f9a63dd7-16fc-4042-a47a-769bbd742f5e"},"_deposit":{"created_by":18,"id":"51042","owners":[18],"pid":{"revision_id":0,"type":"depid","value":"51042"},"status":"published"},"_oai":{"id":"oai:kanazawa-u.repo.nii.ac.jp:00051042","sets":["2812:2813:2837"]},"author_link":["9852","13629"],"item_9_biblio_info_8":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1999-03-08","bibliographicIssueDateType":"Issued"},"bibliographicPageStart":"3p.","bibliographicVolumeNumber":"1995-1996","bibliographic_titles":[{"bibliographic_title":"平成8(1996)年度 科学研究費補助金 基盤研究(A) 研究成果報告書概要"},{"bibliographic_title":"1996 Fiscal Year Final Research Report Summary","bibliographic_titleLang":"en"}]}]},"item_9_creator_33":{"attribute_name":"著者別表示","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{}],"nameIdentifiers":[{},{},{}]}]},"item_9_description_21":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"With regard to the deterioration of concrete due to the chemical attack caused by de-icing salts, it was found that a high-concentration CaCl_2 was very aggressive towards Portland cement concrete, and its aggressivity became more severe at a low temperature than at a high temperature, while no sign of deterioration was observed in NaCl solution idependent of both the temperature and the concentration of solution. The deterioration caused by the ingress of CaCl_2 solution seemed to be attributed to the dissolution of calcium hydroxide and the formation of complex salts. In the mortars incorp orating mineral admixtures such as fly ash, blast-furnace slag and silica fume, the combined effect of a decrease in the content of calcium hydroxide and a reduced chloride ion permeability on the process of hydration of mineral admixtures effectively improved the resistance to calcium chloride attack. Furthermore, it was confirmed that the entrained air in concrete improved the resistance to the calcium chloride attack, but the reduced water : cement ratio had little influence at later stages of exposure time in a high-concentration CaCl_2 solution. Interestingly, a further deterioration accompanied by cracking was found to be caused by the repetitive drying and wetting in CaCl_2 solution.\nWith the regard to the deterioration of concrete due to alkali-silica reaction, in a reactive aggregate-bearing mortars with relatively low alkali contents, the promotion of their expansions in 1N NaCl solution was caused by a rise of OH^- ion concentration in pore solution. The increase in OH^- ion concentration in the pore solution was responsible for the intrusion of NaCl into the mortars containing a reactive aggregate.","subitem_description_type":"Abstract"},{"subitem_description":"本研究は、融雪・融氷剤(塩化ナトリウムおよび塩化カルシウム)のコンクリートの化学的劣化におよぼす影響およびそのメカニズムを解明するものである。融雪・融氷剤(塩化ナトリウムおよび塩化カルシウム)による影響を想定された各種温度および濃度条件の下で綿密に調べることにより、融雪・融氷剤によるコンクリート構造物の化学的劣化に対しての防止対策について具体的な指針を確立することを目的とした。研究計画は、(1)融雪・融氷剤によるコンクリートの化学的劣化メカニズムの解明、(2)融雪・融氷剤によるコンクリート構造物の化学的劣化に対しての防止対策の確立、とに大別できる。\n(1)に関しては、濃度および温度を変化させた塩化ナトリウムおよび塩化カルシウム溶液に各種配合のセメントモルタル供試体を浸漬し、浸漬材令に伴う強度の低下および膨張量の変化などを調べることにより、高濃度の塩化カルシウム溶液においてのみ化学的劣化現象が発生することを明らかにした。また、高濃度の塩化カルシウム溶液による劣化現象がコンクリート中の水酸化カルシウムの溶解とそれに伴う複塩(CaO・CaCl_2・15H_2O)の生成によるものであることを明らかにした。\n(2)に関しては、各種鉱物質混和材(フライアッシュ、高炉スラグ微粉末、シリカフューム)の使用したコンクリートの塩化カルシウム腐食に対する抵抗性を検討するとともに、融雪・融氷剤のコンクリート内部への浸透防ぐ目的で使用される各種表面塗布材の遮塩性およびその化学的劣化現象に対する効果について明らかにした。以上の研究成果をふまえて、融雪・融氷剤によるコンクリートの化学的劣化のメカニズムについて解明するとともに、このような劣化現象の防止対策について具体的な提案を行った。","subitem_description_type":"Abstract"}]},"item_9_description_22":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"研究課題/領域番号:07555134, 研究期間(年度):1995-1996","subitem_description_type":"Other"},{"subitem_description":"出典：研究課題「融雪・融氷剤によるコンクリートの化学的劣化機構の解明と防止対策」課題番号07555134\n（KAKEN：科学研究費助成事業データベース（国立情報学研究所）） \n（https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-07555134/075551341996kenkyu_seika_hokoku_gaiyo/）を加工して作成","subitem_description_type":"Other"}]},"item_9_description_5":{"attribute_name":"提供者所属","attribute_value_mlt":[{"subitem_description":"金沢大学工学部","subitem_description_type":"Other"}]},"item_9_identifier_registration":{"attribute_name":"ID登録","attribute_value_mlt":[{"subitem_identifier_reg_text":"10.24517/00057345","subitem_identifier_reg_type":"JaLC"}]},"item_9_relation_28":{"attribute_name":"関連URI","attribute_value_mlt":[{"subitem_relation_name":[{"subitem_relation_name_text":"https://kaken.nii.ac.jp/search/?qm=20019730"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://kaken.nii.ac.jp/search/?qm=20019730","subitem_relation_type_select":"URI"}},{"subitem_relation_name":[{"subitem_relation_name_text":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555134/"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555134/","subitem_relation_type_select":"URI"}},{"subitem_relation_name":[{"subitem_relation_name_text":"https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-07555134/075551341996kenkyu_seika_hokoku_gaiyo/"}],"subitem_relation_type_id":{"subitem_relation_type_id_text":"https://kaken.nii.ac.jp/report/KAKENHI-PROJECT-07555134/075551341996kenkyu_seika_hokoku_gaiyo/","subitem_relation_type_select":"URI"}}]},"item_9_version_type_25":{"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_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2022-05-20"}],"displaytype":"detail","filename":"TE-PR-KAWAMURA-M-kaken 1999-3p.pdf","filesize":[{"value":"117.6 kB"}],"format":"application/pdf","licensetype":"license_11","mimetype":"application/pdf","url":{"label":"TE-PR-KAWAMURA-M-kaken 1999-3p.pdf","url":"https://kanazawa-u.repo.nii.ac.jp/record/51042/files/TE-PR-KAWAMURA-M-kaken 1999-3p.pdf"},"version_id":"20dee369-d60d-4ea3-ad43-bde8f1622793"}]},"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":"融雪・融氷剤によるコンクリートの化学的劣化機構の解明と防止対策","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"融雪・融氷剤によるコンクリートの化学的劣化機構の解明と防止対策"},{"subitem_title":"Elucidation of Mechnisms of Deterioration of Concrete Caused by Chemical Attack of De-icing Salts and its Preventive Measures","subitem_title_language":"en"}]},"item_type_id":"9","owner":"18","path":["2837"],"pubdate":{"attribute_name":"公開日","attribute_value":"2022-05-20"},"publish_date":"2022-05-20","publish_status":"0","recid":"51042","relation_version_is_last":true,"title":["融雪・融氷剤によるコンクリートの化学的劣化機構の解明と防止対策"],"weko_creator_id":"18","weko_shared_id":-1},"updated":"2023-07-27T13:04:22.569870+00:00"}