In this study, mix performance and mechanical properties of concrete using blast furnace slag fine aggregate were studied by experiment. As ordinary strength concrete, it is necessary that the water content and the chemical admixture content of concrete using blast furnace slag fine aggregate would be increased than river sand concrete in order to gain uniform workability of fresh concrete. However, the mix performance of high strength concrete using blast furnace slag fine aggregate is same as high strength concrete using river sand by using chemical admixture. As same as concrete using river sand, the strength of concrete using blast furnace slag fine aggregate will increase with decrease of water-cement ratio and the compressive strength can exceed 100N/mm2. At early age, the compressive strength of concrete using blast furnace slag fine aggregate is lower than river sand concrete. Under long term curing, the increasing rate of compressive strength of ordinary strength concrete using blast furnace slag fine aggregate will be higher than river sand concrete, but this increasing rate will be lower when the strength of concrete was high. Young's modulus of concrete using blast furnace slag fine aggregate is greater than concrete using river sand, and Young's modulus of concrete using mixed fine aggregate is middle of concrete using river sand and using blast furnace slag. The drying shrinkage of concrete that used blast furnace slag as fine aggregate is less than concrete that used natural river sand as fine aggregate when the mix proportion condition of concrete was identical.本報告は，高炉スラグ細骨材を使用した高強度コンクリートの調合と力学特性に関する実験結果をまとめたものである。高炉スラグ細骨材を使用したコンクリートは，川砂コンクリートと同じワーカビリティーを得るために，普通強度レベルの場合は単位水量を増加させる必要があった。しかし，高強度レベルの場合は，高炉スラグ細骨材コンクリートも川砂の場合と大差がない。高炉スラグ細骨材を使用したコンクリートは，水セメント比を小さくすると川砂の場合と同様に強度が増大し，100N/mm2以上の圧縮強度が得られる。高炉スラグ細骨材コンクリートは，普通強度レベルでは材齢28日の圧縮強度は川砂コンクリートに比較して低く，長期材齢において川砂コンクリートより高くなる傾向を示すが，高強度レベルでは，長期材齢においても川砂コンクリートより高くなることはなかった。高炉スラグ細骨材コンクリートのヤング係数は，圧縮強度が同じ場合，川砂コンクリートより大きくなり，乾燥収縮は川砂を使用したコンクリートより若干小さくなる。
{"title":"Mix Performance and Mechanical Properties of High Strength Concrete using Blast Furnace Slag Fine Aggregate","authors":"D. Shi, Y. Masuda, M. Abe, T. Kage","doi":"10.3151/COJ.51.165","DOIUrl":"https://doi.org/10.3151/COJ.51.165","url":null,"abstract":"In this study, mix performance and mechanical properties of concrete using blast furnace slag fine aggregate were studied by experiment. As ordinary strength concrete, it is necessary that the water content and the chemical admixture content of concrete using blast furnace slag fine aggregate would be increased than river sand concrete in order to gain uniform workability of fresh concrete. However, the mix performance of high strength concrete using blast furnace slag fine aggregate is same as high strength concrete using river sand by using chemical admixture. As same as concrete using river sand, the strength of concrete using blast furnace slag fine aggregate will increase with decrease of water-cement ratio and the compressive strength can exceed 100N/mm2. At early age, the compressive strength of concrete using blast furnace slag fine aggregate is lower than river sand concrete. Under long term curing, the increasing rate of compressive strength of ordinary strength concrete using blast furnace slag fine aggregate will be higher than river sand concrete, but this increasing rate will be lower when the strength of concrete was high. Young's modulus of concrete using blast furnace slag fine aggregate is greater than concrete using river sand, and Young's modulus of concrete using mixed fine aggregate is middle of concrete using river sand and using blast furnace slag. The drying shrinkage of concrete that used blast furnace slag as fine aggregate is less than concrete that used natural river sand as fine aggregate when the mix proportion condition of concrete was identical.本報告は，高炉スラグ細骨材を使用した高強度コンクリートの調合と力学特性に関する実験結果をまとめたものである。高炉スラグ細骨材を使用したコンクリートは，川砂コンクリートと同じワーカビリティーを得るために，普通強度レベルの場合は単位水量を増加させる必要があった。しかし，高強度レベルの場合は，高炉スラグ細骨材コンクリートも川砂の場合と大差がない。高炉スラグ細骨材を使用したコンクリートは，水セメント比を小さくすると川砂の場合と同様に強度が増大し，100N/mm2以上の圧縮強度が得られる。高炉スラグ細骨材コンクリートは，普通強度レベルでは材齢28日の圧縮強度は川砂コンクリートに比較して低く，長期材齢において川砂コンクリートより高くなる傾向を示すが，高強度レベルでは，長期材齢においても川砂コンクリートより高くなることはなかった。高炉スラグ細骨材コンクリートのヤング係数は，圧縮強度が同じ場合，川砂コンクリートより大きくなり，乾燥収縮は川砂を使用したコンクリートより若干小さくなる。","PeriodicalId":409556,"journal":{"name":"Concrete Journal","volume":"28 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114127160","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}
According to the former JIS A 5022, which describes technical requirement of recycled concrete using recycled aggregate class M, the scope of application of recycled concrete using recycled aggregate class M was limited to the underground structures which are not affected by freezing-thawing action. However, JIS A 5022 was revised in 2012, so that the new test method which can evaluate the freezing and thawing resistance of recycled coarse aggregate has been introduced. The freezing and thawing resistant recycled concrete using recycled aggregate class M is specified in the revised JIS A 5022, which extends applicability of recycled concrete using recycled aggregate class M to concrete members which suffer from freezing-thawing action.JIS A 5022に規定される再生骨材コンクリートMは，これまで乾燥収縮の影響や凍結融解作用を受けにくい地下構造物等に使用範囲が限定されていた。しかしながら，2012年のJIS規格の改正において再生粗骨材の耐凍害性を評価するための試験方法が規定され，再生骨材コンクリートMに耐凍害品が設定された。その内容を紹介する。
According to the former JIS A 5022，which describes technical requirement of recycled concrete using recycled aggregate class M，the scope of application of recycled concrete using recycled aggregate class M was limited to theunderground structures which are not affected by freezing-thawing action. However，JIS a5022was revised in 2012，so that the new test method which can evaluate the freezing and thawing resistance of recycledcoarse aggregate has been introduced. The freezing and thawing resistant recycled concrete usingrecycled aggregate class M is specified in the revised JIS A 5022，which extends applicability of recycled concrete using recycled aggregate class M to concretemembers which suffer from freezing-thawing action.JIS A 5022中规定的再生骨料混凝土M为:到目前为止，使用范围被限定在不易受到干燥收缩影响和冻融作用的地下建筑物等。但是，在2012年JIS标准修订中规定了评价再生粗骨料耐冻害性的试验方法，对再生骨料混凝土M设定了耐冻害品。我来介绍那个内容。
{"title":"Freezing-thawing Resistant Recycled Concrete using Recycled Aggregate Class M","authors":"H. Katahira, A. Kôyama, H. Watanabe","doi":"10.3151/COJ.51.159","DOIUrl":"https://doi.org/10.3151/COJ.51.159","url":null,"abstract":"According to the former JIS A 5022, which describes technical requirement of recycled concrete using recycled aggregate class M, the scope of application of recycled concrete using recycled aggregate class M was limited to the underground structures which are not affected by freezing-thawing action. However, JIS A 5022 was revised in 2012, so that the new test method which can evaluate the freezing and thawing resistance of recycled coarse aggregate has been introduced. The freezing and thawing resistant recycled concrete using recycled aggregate class M is specified in the revised JIS A 5022, which extends applicability of recycled concrete using recycled aggregate class M to concrete members which suffer from freezing-thawing action.JIS A 5022に規定される再生骨材コンクリートMは，これまで乾燥収縮の影響や凍結融解作用を受けにくい地下構造物等に使用範囲が限定されていた。しかしながら，2012年のJIS規格の改正において再生粗骨材の耐凍害性を評価するための試験方法が規定され，再生骨材コンクリートMに耐凍害品が設定された。その内容を紹介する。","PeriodicalId":409556,"journal":{"name":"Concrete Journal","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128292062","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}
“Subcommittee for survey research on technology for demolition, reuse, and repair of concrete structures taking CO₂ reduction into account” was set up by the Concrete Committee of the Japan Society of Civil Engineers in order to evaluate the CO₂ uptake by crushed waste concrete and to investigate the methods of reducing environmental impacts of the repair for existing concrete structures. These activities are summarised here.土木学会コンクリート委員会CO2削減を考慮したコンクリート構造物の解体，再利用，補修技術に関する調査研究小委員会では，解体コンクリートによるCO2の固定化技術，補修における環境負荷の低減に関する調査研究を実施した。本稿ではその活動内容の概要について紹介する。
survey research on technology for demolition, reuse，and repair of concrete structures taking CO₂reduction into account’was set up by the concreteCommittee of the Japan Society of Civil Engineers in order to evaluate the CO₂uptake by crushedwaste concrete and to investigate the methods of reducing environmental impacts of the repair forexisting concrete structures. These activities are summarised here。土木学会混凝土委员会关于考虑到CO2减排的混凝土构造物的解体，再利用，维修技术的调查研究小委员会，根据解体混凝土的CO2固定化技术;实施了关于在维修中降低环境负荷的调查研究。本文介绍了那个活动内容的概要。
{"title":"コンクリート構造物の補修・解体・再利用におけるCO2削減を目指して","authors":"K. Kawai, K. Kobayashi, A. Ueno, Y. Kato","doi":"10.3151/COJ.50.1006","DOIUrl":"https://doi.org/10.3151/COJ.50.1006","url":null,"abstract":"“Subcommittee for survey research on technology for demolition, reuse, and repair of concrete structures taking CO₂ reduction into account” was set up by the Concrete Committee of the Japan Society of Civil Engineers in order to evaluate the CO₂ uptake by crushed waste concrete and to investigate the methods of reducing environmental impacts of the repair for existing concrete structures. These activities are summarised here.土木学会コンクリート委員会CO2削減を考慮したコンクリート構造物の解体，再利用，補修技術に関する調査研究小委員会では，解体コンクリートによるCO2の固定化技術，補修における環境負荷の低減に関する調査研究を実施した。本稿ではその活動内容の概要について紹介する。","PeriodicalId":409556,"journal":{"name":"Concrete Journal","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124951914","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}
In Limestone Association of Japan, in order to make everyone correctly understand the properties of crushed limestone aggregate, Committee on Concrete Aggregate was established by the specialists in limestone resources and concrete materials in 2008. In our Committee, we stacked the test data on the properties of concrete with limestone aggregate and widely collected latest technology findings and data. Furthermore, we made an in-depth study on various issues. Since we summarized the results as “Limestone Aggregate and Concrete - Addendum (2012) ”, we will introduce here its main points.石灰石鉱業協会ではコンクリート用石灰石骨材の特性を正しく理解していただくために，石灰石資源およびコンクリート材料の専門家によるコンクリート骨材研究会を2008年に設置した。同研究会では，石灰石骨材を使用したコンクリートの物性に関する試験データを積み重ねるとともに，最新の技術的所見・データを広く収集し，種々の検討を重ねた。今回，本成果を「石灰石骨材とコンクリート 補遺版2012」として取りまとめたので，その要点をここで紹介する。
Limestone Association of Japan，in order to make everyone correctly understand the properties of crushed limestone aggregate，Committee on Concrete Aggregate was established by the specialists in limestone resources andconcrete materials in 2008. in our Committee，we stacked the test data on the properties of concrete with limestone aggregate and widely collectedlatest technology findings and data. Furthermore，we made an in-depth study on various issues. Since we summarized the results as“Limestone Aggregate”and Concrete - Addendum(2012)”，we will introduce here its main points。石灰石矿业协会为了让人们正确理解混凝土用石灰石骨料的特性，于2008年成立了由石灰石资源及混凝土材料专家组成的混凝土骨料研究会。该研究会在积累有关使用石灰石骨料的混凝土物性的试验数据的同时，广泛收集最新的技术成果和数据，反复进行了各种研究。此次将本成果整理为《石灰石骨料与混凝土补缺版2012》，在此介绍要点。
{"title":"石灰石骨材がコンクリートの諸特性に及ぼす影響 : 微粒分量, 乾燥収縮, ASR, 硫酸塩劣化, 圧縮強度","authors":"K. Tada, N. Takao, K. Yamada, H. Kawano","doi":"10.3151/COJ.50.904","DOIUrl":"https://doi.org/10.3151/COJ.50.904","url":null,"abstract":"In Limestone Association of Japan, in order to make everyone correctly understand the properties of crushed limestone aggregate, Committee on Concrete Aggregate was established by the specialists in limestone resources and concrete materials in 2008. In our Committee, we stacked the test data on the properties of concrete with limestone aggregate and widely collected latest technology findings and data. Furthermore, we made an in-depth study on various issues. Since we summarized the results as “Limestone Aggregate and Concrete - Addendum (2012) ”, we will introduce here its main points.石灰石鉱業協会ではコンクリート用石灰石骨材の特性を正しく理解していただくために，石灰石資源およびコンクリート材料の専門家によるコンクリート骨材研究会を2008年に設置した。同研究会では，石灰石骨材を使用したコンクリートの物性に関する試験データを積み重ねるとともに，最新の技術的所見・データを広く収集し，種々の検討を重ねた。今回，本成果を「石灰石骨材とコンクリート 補遺版2012」として取りまとめたので，その要点をここで紹介する。","PeriodicalId":409556,"journal":{"name":"Concrete Journal","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134378292","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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