Concrete Journal
Online ISSN : 2186-2753
Print ISSN : 0387-1061
ISSN-L : 0387-1061
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Volume 47, Issue 3
Displaying 1-18 of 18 articles from this issue
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  • Study about the Application of the Concrete that uses Scallop Shell as Fine Aggregate to Port Structures
    T. Yamauchi, O. Kiyomiya, H. Takahashi, Y. Akira
    2009 Volume 47 Issue 3 Pages 3_24-3_31
    Published: 2009
    Released on J-STAGE: March 27, 2012
    DOIhttps://doi.org/10.3151/coj.47.3_24
    JOURNAL FREE ACCESS
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    We aim at the establishment of effective a large quantity of recycling methods of a shell holding about 50% of the whole scallop, and push forward the study of the concrete that uses scallop shell crushed by a rotary crushing machine as fine aggregate. From past a series of results of research for the application to the port structures by the indoor examination and proof examination. As for the basic property and utility of the shell concrete, a result without the inferiority is provided in comparison with the normal concrete.
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  • Environmentally-Friendly Material Characteristics of Concrete using Lapilli and its Application for Structures
    M. Kagaya, Y. Shirokado, W. Iimura
    2009 Volume 47 Issue 3 Pages 3_32-3_38
    Published: 2009
    Released on J-STAGE: March 27, 2012
    DOIhttps://doi.org/10.3151/coj.47.3_32
    JOURNAL FREE ACCESS
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    There is much lapilli in north Akita area in Japan, which is volcanic lava sediment. It is porous, and has high absorption (68.97%) and low density (1.18g/cm3). The properties of concrete using lapilli as coarse aggregate were shown. The test results of impact absorption, elastic repulsion and skid resistance on a surface of concrete plate which lapilli was exposed by washed finish were high level. The growth height of plant on the concrete plate and performance of early recovery of nature in the irrigation canal that was constructed with the plate were superior to the case of ordinary concrete. Finally, the applications of environmentally-friendly material characteristics of the concrete using lapilli for pedestrian pavements in a park and embedment forms in a check dam against debris flow were introduced.
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  • Study on the Compaction of Precast Concrete by the Horizontal Vibration Method
    S. Kawabe, S. Matsuoka, H. Chen, T. Okajima
    2009 Volume 47 Issue 3 Pages 3_39-3_46
    Published: 2009
    Released on J-STAGE: March 27, 2012
    DOIhttps://doi.org/10.3151/coj.47.3_39
    JOURNAL FREE ACCESS
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    The effect of concrete compacted in the horizontal vibration method with a low vibration and a high amplitude was examined by many conditions. These conditions are the vibration acceleration, the slump of concrete, the height at placing and three elements of the mould. This report presents the best condition of compaction from experimental and theoretical data. The contents of this report are outline of the horizontal vibration method, conditions of compaction, comparison with a table vibration and the effect of compaction with best conditions. The horizontal vibration method is adopted at 39 factories in Japan, and is developing more and more.
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