Concrete Journal
Online ISSN : 2186-2753
Print ISSN : 0387-1061
ISSN-L : 0387-1061
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Volume 50, Issue 8
Displaying 1-15 of 15 articles from this issue
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  • Bond Constitutive Laws between Concrete and Reinforcement and their Applications
    T. Kanakubo, Y. Satoh, K. Tajima, Y. Uchida, H. Shima
    2012 Volume 50 Issue 8 Pages 661-668
    Published: 2012
    Released on J-STAGE: September 01, 2012
    DOIhttps://doi.org/10.3151/coj.50.661
    JOURNAL FREE ACCESS
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    The transmission of internal force between concrete and reinforcement and their displacement gap are called as bond stress and slip, respectively. The bond constitutive laws are defined as the relationship between bond stress and slip. There are lots of proposed types of bond constitutive laws, so it is necessary that the laws should be selected carefully to adopt in finite element analysis. Japan Concrete Institute organized the Technical Committee for bond problems to clarify the information about bond constitutive laws and propose the appropriate applications of the laws. Some of committee activities such as meso-scale analysis, review works for previous papers and analysis results for tension-stiffening effect are introduced.
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  • The Preventive Method of Alkali-Silica Reaction Uniquely Established by JR East
    Y. Matsuda, K. Kumabe, J. Kino, M. Iwata
    2012 Volume 50 Issue 8 Pages 669-675
    Published: 2012
    Released on J-STAGE: September 01, 2012
    DOIhttps://doi.org/10.3151/coj.50.669
    JOURNAL FREE ACCESS
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    A long time has passed since the control measure of alkali-aggregate reaction (alkali-silica reaction : ASR) was prescribed by JIS. So it's contemplated that the control measure of ASR prescribed by JIS on aggregate of concrete has worked on the reduction of ASR. However, there are the damages by ASR in the concrete structures using the aggregate judged “Harmless” by JIS. Therefore, in JR East Japan, the new judgement method of aggregate was set. The number of classification of judgement on aggregate was changed from two into three without changing the current aggregate test method by JIS. Moreover, use of effective blended cement was set as the method for control of ASR.
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