Concrete Journal
Online ISSN : 2186-2753
Print ISSN : 0387-1061
ISSN-L : 0387-1061
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Volume 41, Issue 2
Displaying 1-7 of 7 articles from this issue
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  • The Present state of Construction e-Market place
    S. Yabuhara
    2003 Volume 41 Issue 2 Pages 3-9
    Published: February 01, 2003
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.41.2_3
    JOURNAL FREE ACCESS
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    Construction market has been facing a drastic change. The internet system enables us to realize a market where we can share a series of building construction process such as planning, design, procurement, execution, facility management, regardless the size of the business or location.
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  • Development of Suitable Cement for Durable Concrete Structures
    K. Yamada, R. Tomita
    2003 Volume 41 Issue 2 Pages 10-17
    Published: February 01, 2003
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.41.2_10
    JOURNAL FREE ACCESS
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    The current state of economy and progress of sustainable development in Japan has made it more important to provide durable concrete structures economically. Due to current client demands, the required strength of cement has become increasingly stronger. Some have suggested that this trend may be the reason of reduced durability in concrete structures. Returning to the basics, this study will consider suitable cement for use in constructing durable concrete structures and focus on various concrete properties such as material segregation, heat and strength development, and durability at the same time. For concrete of the common strength class a minimum amount of cement powder content is required to prevent material segregation. However in order to reduce adiabatic temperature rise, it is recommended to replace part of the cement powder content with an inert substitute.
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  • Efforts of Chiba Concrete Product Cooperation toward utilizing Eco-cement for concrete products
    H. Hirano
    2003 Volume 41 Issue 2 Pages 18-24
    Published: February 01, 2003
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.41.2_18
    JOURNAL FREE ACCESS
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    The Japanese Industrial Standard for Eco-cement has been enacted in July 2002. The CCPC (Chiba Concrete Product Cooperation) published a manual, which underlines the fundamental guidelines for using Eco-cement as a concrete material. This paper describes the contents of this manual, and the outline of the test construction that was carried out by Chiba Prefecture. In addition, the qualities of the concrete specimens as well as the concrete products made of Eco-cement in the factory are explained in this paper.
    Although Eco-cement concrete exhibits similar fresh/hardened properties when compared with concrete made of ordinary Portland cement, the total amount of chloride ion in the former is higher than that of the latter. Therefore, the chloride ion content in Eco-cement concrete should be carefully evaluated by using the proper method. In order for Eco-cement to gain a wider acceptance, it is necessary to guarantee the uniform quality of Eco-cement itself, as well to investigate the durability of Eco-cement concrete. Further investigations are needed to accumulate data on these factors.
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    2003 Volume 41 Issue 2 Pages 26-31
    Published: February 01, 2003
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.41.2_26
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    2003 Volume 41 Issue 2 Pages 32-38
    Published: February 01, 2003
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.41.2_32
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese]
    2003 Volume 41 Issue 2 Pages 39-45
    Published: February 01, 2003
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.41.2_39
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    2003 Volume 41 Issue 2 Pages 9
    Published: 2003
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.41.2_9
    JOURNAL FREE ACCESS
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    [in Japanese]
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