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The characteristics of such concrete has already published in many papers by the auther and others. There are two kinds of crushed stone used in Okinawa Island. One is hard and called \"Motobu\" crushed stone and has large density and small specific water content. So the static and dynamic Young\u0027s maduli of the concrete which uses Motobu crushed stone are much larger than ones which described in the specifications of AIJ and JSCE in the practical range of compressive strength between 150 and 400kg/cm². The other is relatively soft and called Ryukyu lime stone crushed stone. The concrete using the relatively soft crushed stone has smaller Young\u0027s moduli than the concrete with Motobu crushed stone, but still lightly larger than specified values in the AIJ specification. There are many factors which affect the values of the Young\u0027s maduli of concrete. In this study, compressive strength and unit weight of concrete are the most affecting factors. Formulae for both static and dynamic Young\u0027s moduli are presented by using the method of the least square. The formulae are described in terms of compressive strength and unit weight of concrete. The increasing pattern of compressing strength of the concrete using hard crushed stone as the time passes is almost the same as described in common technical books. The rate of increase of Young\u0027s moduli as the time passes is much slower than ones of compressive strength. The concrete using larger maximum size crushed stone exhibits much larger Young\u0027s moduli than the concrete with small maximum size. Bleeding behavior of the concrete using crushed stone and sea sand will be much improved by using \"Ishigū\" as a part of fine aggregate. 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沖縄のコンクリートの基本的性状 2
http://hdl.handle.net/20.500.12000/27014
http://hdl.handle.net/20.500.12000/27014a31c0f3c-95ca-45ac-9a37-eafe47666627
名前 / ファイル | ライセンス | アクション |
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No15P001.pdf
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Item type | デフォルトアイテムタイプ(フル)(1) | |||||||||
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公開日 | 2013-07-24 | |||||||||
タイトル | ||||||||||
タイトル | 沖縄のコンクリートの基本的性状 2 | |||||||||
言語 | ja | |||||||||
タイトル | ||||||||||
タイトル | Studies on Fundamental Properties of Concrete in Okinawa, 2 | |||||||||
言語 | en | |||||||||
作成者 |
具志, 幸昌
× 具志, 幸昌
× Gushi, Yukimasa
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アクセス権 | ||||||||||
アクセス権 | open access | |||||||||
アクセス権URI | http://purl.org/coar/access_right/c_abf2 | |||||||||
内容記述 | ||||||||||
内容記述タイプ | Other | |||||||||
内容記述 | Using sea sand and crushed stone is the distinctive feature of concrete in Okinawa Prefecture. The characteristics of such concrete has already published in many papers by the auther and others. There are two kinds of crushed stone used in Okinawa Island. One is hard and called "Motobu" crushed stone and has large density and small specific water content. So the static and dynamic Young's maduli of the concrete which uses Motobu crushed stone are much larger than ones which described in the specifications of AIJ and JSCE in the practical range of compressive strength between 150 and 400kg/cm². The other is relatively soft and called Ryukyu lime stone crushed stone. The concrete using the relatively soft crushed stone has smaller Young's moduli than the concrete with Motobu crushed stone, but still lightly larger than specified values in the AIJ specification. There are many factors which affect the values of the Young's maduli of concrete. In this study, compressive strength and unit weight of concrete are the most affecting factors. Formulae for both static and dynamic Young's moduli are presented by using the method of the least square. The formulae are described in terms of compressive strength and unit weight of concrete. The increasing pattern of compressing strength of the concrete using hard crushed stone as the time passes is almost the same as described in common technical books. The rate of increase of Young's moduli as the time passes is much slower than ones of compressive strength. The concrete using larger maximum size crushed stone exhibits much larger Young's moduli than the concrete with small maximum size. Bleeding behavior of the concrete using crushed stone and sea sand will be much improved by using "Ishigū" as a part of fine aggregate. Bleeding rate or quantity becomes half or one-third, if "Ishigū" is used properly with other materials. | |||||||||
内容記述 | ||||||||||
内容記述タイプ | Other | |||||||||
内容記述 | 紀要論文 | |||||||||
出版者 | ||||||||||
言語 | ja | |||||||||
出版者 | 琉球大学理工学部 | |||||||||
出版者 | ||||||||||
言語 | en | |||||||||
出版者 | Science and Engineering Division, University of the Ryukyus | |||||||||
言語 | ||||||||||
言語 | jpn | |||||||||
資源タイプ | ||||||||||
資源タイプ | departmental bulletin paper | |||||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||||||
出版タイプ | ||||||||||
出版タイプ | VoR | |||||||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||||||
識別子 | ||||||||||
識別子 | http://hdl.handle.net/20.500.12000/27014 | |||||||||
識別子タイプ | HDL | |||||||||
収録物識別子 | ||||||||||
収録物識別子タイプ | ISSN | |||||||||
収録物識別子 | 0387-429X | |||||||||
収録物識別子 | ||||||||||
収録物識別子タイプ | NCID | |||||||||
収録物識別子 | AN00250785 | |||||||||
収録物名 | ||||||||||
言語 | ja | |||||||||
収録物名 | 琉球大学理工学部紀要. 工学篇 | |||||||||
収録物名 | ||||||||||
言語 | en | |||||||||
収録物名 | Bulletin of Science & Engineering Division, University of the Ryukyus. Engineering | |||||||||
書誌情報 |
号 15, p. 1-12, 発行日 1978-03-01 |