Concrete Journal
Online ISSN : 2186-2753
Print ISSN : 0387-1061
ISSN-L : 0387-1061
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Volume 43, Issue 6
Displaying 1-7 of 7 articles from this issue
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  • Revision of Maintenance Manual for Harbor Facilities
    H. Yokota
    2005 Volume 43 Issue 6 Pages 3-9
    Published: June 01, 2005
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.43.6_3
    JOURNAL FREE ACCESS
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    Principles of the revision of Maintenance Manual for Harbor Facilities (provisional) are introduced in this paper. According to this manual, maintenance of existing harbour facilities will be done based on the performance verification system and the life-cycle management technique during the service life of structures. The maintenance work including inspection, evaluation, prediction, and remedial action is briefly explained with standardized manners. To select the most appropriate remedial action, the life-cycle cost will be estimated among their alternatives for extending the lifespan of structures. The Markovian model will be introduced for this purpose. The revised version of manual will be published by the end of March 2006.
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  • Relationship between Chloride Content and Steel Corrosion in Hardened Cement
    M. Ashida
    2005 Volume 43 Issue 6 Pages 11-13
    Published: June 01, 2005
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.43.6_11
    JOURNAL FREE ACCESS
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    By corroding steel in solution for the verification from a thermodynamic viewpoint, protection performance to steel materials of a hardened cement is clarified. The mole ratio of the amount of chloride ion (corrosion factor) and the amount of hydroxide ion (protection factor) presumes the maximum amount of chloride ion due to verify the recent research results affects steel corrosion. Furthermore, the consideration about the maximum value of the amount of chloride ion in PC grout is verified from the mole ratio.
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  • Technical Introduction of an External Seismic Strengthening of Structure using Diagonal PC Cable
    PARALLEL System for Seismic Strengthening of Buildings
    K. Tanaka, T. Araki, T. Sekiguchi, N. Hayashida
    2005 Volume 43 Issue 6 Pages 14-19
    Published: June 01, 2005
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.43.6_14
    JOURNAL FREE ACCESS
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    As a conventional construction method of the seismic strengthening, the steel brace occupies the majority to the seismic strengthening actively done for a public building now. However, it is difficult to strengthening it while using the building when these conventional construction methods are used. To solve such problems, the authors have developed a new method, so called PARALLEL System for seismic strengthening of buildings, wtich applies external diagonal cable stayed. This paper reports the development and constuction of PARALLEL System.
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  • Thaumasite Form of Sulfate Attack
    A Review of the Deterioration Mechanism and the Evaluating Method of Risk
    N. Yoshida, K. Yamada
    2005 Volume 43 Issue 6 Pages 20-27
    Published: June 01, 2005
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.43.6_20
    JOURNAL FREE ACCESS
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    In Western countries, new chemical deterioration mechanism of the concrete, “Thaumasite form of Sulfate Attack” draws attention. Thaumasite is formed when the sulfate ion mainly from the soil and carbonate ion mainly from the carbonate aggregate react with the calcium silicate hydrate under the condition of low temperature and existence of water. Thaumasite softens the cement composition and causes cracking and spalling of the concrete surface. Authors have obtained the knowledge about this deterioration from the reports by Western researchers, and would like to supply useful information in this paper.
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    2005 Volume 43 Issue 6 Pages 29-35
    Published: June 01, 2005
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.43.6_29
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    2005 Volume 43 Issue 6 Pages 36-43
    Published: June 01, 2005
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.43.6_36
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    2005 Volume 43 Issue 6 Pages 44-50
    Published: June 01, 2005
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.43.6_44
    JOURNAL FREE ACCESS
    Download PDF (15935K)
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