A chemical admixture for concrete that is attracting attention recently is single-liquid viscosity agent type high-range AE (air entraining) water reducing agent obtained by combining viscosity agent and high-range AE water reducing agent, which allows the manufacture of viscosity agent type self-compacting concrete without having to separately add viscosity agent. Another one is shrinkage reducing type high-range AE water reducing agent obtained by combining shrinkage reducing agent and high-range AE water reducing agent, which can reduce drying shrinkage strain by about 5% to 15% compared with concrete that uses conventional high-range AE water reducing agent. This paper describes the features and advantages of these two types of chemical admixtures.最近注目されているコンクリート用化学混和剤として，増粘剤と高性能AE減水剤を組み合わせた増粘剤一液タイプの高性能AE減水剤は，増粘剤を別途添加することなく増粘剤系の高流動コンクリートを製造できる。また，収縮低減剤と高性能AE減水剤の組み合わせによる収縮低減タイプの高性能AE減水剤は，従来の高性能AE減水剤を使用したコンクリートに対して5～15％程度の乾燥収縮ひずみが低減できる。本稿は，これら2種類の化学混和剤について，その特徴や効果について解説する。
A chemical admixture for concrete that is attracting attention recently is single-liquid viscosityagent type high-range AE (air entraining) water reducing agent obtained by combining viscosity agentand high-range AE water reducing agent，which allows the manufacture of viscosity agent type self-compacting concrete without having toseparately add viscosity agent. Another one is shrinkage reducing type high-range AE water reducingagent obtained by combining shrinkage reducing agent and high-range AE water reducing agentwhich can reduce drying shrinkage strain by about 5% to 15% compared with concrete that usesconventional high-range AE water reducing agent. This paper describes the features and advantages ofthese two types of chemical admixtures。作为最近备受关注的混凝土用化学混和剂，将增稠剂和高性能AE减水剂组合而成的增稠剂一液型高性能AE减水剂，无需另外添加增稠剂即可制造增稠剂类高流动混凝土。另外，收缩减少剂和高性能AE减水剂组合而成的收缩减少型高性能AE减水剂，与使用以往高性能AE减水剂的混凝土相比，干燥收缩形变可降低5 ~ 15%。本文将对这两种化学混和剂的特点和效果进行说明。
{"title":"最近の高性能AE減水剤について（増粘剤一液タイプ・収縮低減タイプ）","authors":"正和 土谷, 和秀 齊藤","doi":"10.3151/COJ.51.237","DOIUrl":"https://doi.org/10.3151/COJ.51.237","url":null,"abstract":"A chemical admixture for concrete that is attracting attention recently is single-liquid viscosity agent type high-range AE (air entraining) water reducing agent obtained by combining viscosity agent and high-range AE water reducing agent, which allows the manufacture of viscosity agent type self-compacting concrete without having to separately add viscosity agent. Another one is shrinkage reducing type high-range AE water reducing agent obtained by combining shrinkage reducing agent and high-range AE water reducing agent, which can reduce drying shrinkage strain by about 5% to 15% compared with concrete that uses conventional high-range AE water reducing agent. This paper describes the features and advantages of these two types of chemical admixtures.最近注目されているコンクリート用化学混和剤として，増粘剤と高性能AE減水剤を組み合わせた増粘剤一液タイプの高性能AE減水剤は，増粘剤を別途添加することなく増粘剤系の高流動コンクリートを製造できる。また，収縮低減剤と高性能AE減水剤の組み合わせによる収縮低減タイプの高性能AE減水剤は，従来の高性能AE減水剤を使用したコンクリートに対して5～15％程度の乾燥収縮ひずみが低減できる。本稿は，これら2種類の化学混和剤について，その特徴や効果について解説する。","PeriodicalId":409556,"journal":{"name":"Concrete Journal","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129895847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The New Dismantling Method of High-rise Buildings using the Movable Scaffolding System with Over-head Cranes","authors":"H. Nishioka, S. Arai, K. Nokata, M. Morita","doi":"10.3151/COJ.51.265","DOIUrl":"https://doi.org/10.3151/COJ.51.265","url":null,"abstract":"","PeriodicalId":409556,"journal":{"name":"Concrete Journal","volume":"70 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131848827","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"What I Think in Relationship with JCI","authors":"M. Abe","doi":"10.3151/COJ.51.233","DOIUrl":"https://doi.org/10.3151/COJ.51.233","url":null,"abstract":"","PeriodicalId":409556,"journal":{"name":"Concrete Journal","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124751639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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