Concrete Journal
Online ISSN : 2186-2753
Print ISSN : 0387-1061
ISSN-L : 0387-1061
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Volume 53, Issue 12
Displaying 1-12 of 12 articles from this issue
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  • Basic Properties of Self-compacting Concrete Using Seawater and Sea Sand
    T. Sakai, H. Takenaka, R. Tanaka, H. Koyama, T. Yamaji, O. Kiyomiya
    2015 Volume 53 Issue 12 Pages 1038-1045
    Published: 2015
    Released on J-STAGE: December 01, 2016
    DOIhttps://doi.org/10.3151/coj.53.12_1038
    JOURNAL FREE ACCESS
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    For the purpose of developing self-compacting concrete that uses seawater as mixing water and sea sand as fine aggregate, a new admixture capable of imparting excellent flowability and adequate viscosity to concrete using seawater and sea sand was developed, and the basic properties of fresh concrete and hardened concrete using that admixture were verified. The production of self-compacting concrete with excellent flowability and adequate segregation resistance was found to be possible through the use of the new admixture, and the resulting concrete was confirmed to have basic properties equivalent or superior to those of self-compacting concrete that uses tap water and inland sand.
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  • Establishment of Infra-Dock for Concrete Structures
    M. Ohtsu
    2015 Volume 53 Issue 12 Pages 1046-1050
    Published: 2015
    Released on J-STAGE: December 01, 2016
    DOIhttps://doi.org/10.3151/coj.53.12_1046
    JOURNAL FREE ACCESS
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    Toward the sustainable society, the long service-life of infrastructure is going to be an evolutional target. Aging problems and damages due to natural disasters in concrete structures have updated the urgent demand for continuing maintenance of the structures in service. Because this issue is critical for the sustainable infrastructure, the target of maintenance should be shifted from diagnosis to prognosis. Consequently, we set up the technical committee JCI-TC-125FS on Feasibility of Establishment of Infra-Dock for Concrete Structures establishment, where the term of infra-docks is so-called as referring to “the ningen dock”. Based on the achievements in this committee, concept and contents of the infra-dock for concrete structures are briefly summarized.
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  • Transportation Method for High-Speed Construction of Large Concrete Dams
    T. Tashiro, H. Ouchi, N. Sakata, K. Watanabe
    2015 Volume 53 Issue 12 Pages 1051-1057
    Published: 2015
    Released on J-STAGE: December 01, 2016
    DOIhttps://doi.org/10.3151/coj.53.12_1051
    JOURNAL FREE ACCESS
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    As the need for high-speed construction of large concrete dams has arisen in recent years, ways to increase the efficiency and speed of concrete production, transportation, placing, and compacting are being studied. The transportation of large amounts of dam concrete including coarse aggregate of large maximum size without material segregation has been considered difficult to achieve through facility size expansion alone and a tough challenge. This report provides an overview of various concrete transportation equipment for dam construction, and focusing on the SP-TOM method, which enables the transportation of large amounts of concrete, it reports the results of a study of its mechanism for suppressing material segregation.
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