Concrete Journal
Online ISSN : 2186-2753
Print ISSN : 0387-1061
ISSN-L : 0387-1061
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Volume 52, Issue 3
Displaying 1-12 of 12 articles from this issue
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TOPICS
  • For Extending the Use of Mineral Admixture in Concrete
    S. Sogo, H. Kawano, T. Noguchi, S. Miyazawa, R. Chikamatsu
    2014 Volume 52 Issue 3 Pages 236-242
    Published: 2014
    Released on J-STAGE: March 01, 2015
    DOIhttps://doi.org/10.3151/coj.52.236
    JOURNAL FREE ACCESS
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    From the viewpoint of preserving the global environment and making efficient use of resources, the use of by-products in the field of construction to reduce environmental impact has become a social requirement. While by-products such as ground granulated blast furnace slag and fly ash have the effect of improving the quality of concrete and have long been used as blending components in blended cement, their use as mineral admixtures has been limited and more active use is desirable. The quality of ground granulated blast furnace slag and fly ash as concrete materials is covered by JIS, Japan Society of Civil Engineers guidelines and Architectural Institute of Japan guidelines, and the conditions for their use as mineral admixtures have been established, but it cannot be said that they are being widely used at present. This report sorts the issues that need to be addressed for the active use of these by-products for concrete admixture and proposes measures to expand their use.
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  • Integrated Evaluation of Structural Performance over Time of Concrete Structures with Chloride Induced Damage
    [in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
    2014 Volume 52 Issue 3 Pages 243-250
    Published: 2014
    Released on J-STAGE: March 01, 2015
    DOIhttps://doi.org/10.3151/coj.52.243
    JOURNAL FREE ACCESS
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    This paper presents some of the results achieved by Technical Committee on Systematization to Evaluate Structure and Durability Performance in Corroded RC Structure, which works to establish the use of numerical structural analysis as an evaluation method that allows numerical representation in space and time of durability of concrete structures with chloride induced damage（hereinafter, structural performance over time）, and an index of structural performance over time allowing the evaluation of total structural systems. This paper covers in particular methods to evaluate the spatial variability of the amount of corrosion that affects structural performance using probabilistic and statistical techniques, and constitutive models related to reinforcement corrosion and the bond between concrete and corroded reinforcement, which are essential for the finite element analysis of corroded concrete structures. Further, an index of structural performance over time is proposed and formulated, and trial calculation results for total structural systems are introduced.
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