Concrete Journal
Online ISSN : 2186-2753
Print ISSN : 0387-1061
ISSN-L : 0387-1061
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Volume 38, Issue 11
Displaying 1-7 of 7 articles from this issue
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  • State-of-the-arts in Seismic Rehabilitation of Concrete Buildings
    S. Sugano
    2000 Volume 38 Issue 11 Pages 12-21
    Published: November 01, 2000
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.38.11_12
    JOURNAL FREE ACCESS
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    The states of practice and research on seismic rehabilitation of concrete buildings are described with emphasis on those after the 1995 Hyogoken-Nanbu Earthquake. Many cases of seismic evaluation and seismic rehabilitation of existing buildings are reported recently, however, a large number of vulnerable buildings have not yet been seismically evaluated and rehabilitated. Many rehabilitation techniques have been improved or newly developed to achieve 1) short construction period, 2) no removal of occupants and 3) reduction of hindrance resulting from construction. Corresponding to the strong social demands for the seismic rehabilitation without loss of building function and evacuation of occupants, the researches on 1) column jacketing with continuous fibers, 2) strengthening existing frames with new external structures and 3) response control techniques using seismic isolation and supplemental damping system have been conducted.
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  • Ammonia Generation from Concrete and Countermeasures
    K. Kobayashi
    2000 Volume 38 Issue 11 Pages 22-28
    Published: November 01, 2000
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.38.11_22
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    Ammonia generated from concrete causes discoloration of cultural assets accommodated in storage vaults of art museums. It is also a source of contamination in clean rooms where semiconductors and liquid crystals are manufactured.
    The transitions in past research concerning ammonia gas generated from concrete are summarized in this paper. Based on information such as that generation of ammonia from concrete is caused by nitride existing in cement and aggregates, the raw materials of concrete, and foliated silicates like clay minerals and mica which contain ammonium ions, and that limestone does not contain ammonia generating substances, countermeasures against ammonia generation are proposed.
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  • Development of Recyclable Concrete based on Material Conservation
    M. Tamura, T. Noguchi, F. Tomosawa
    2000 Volume 38 Issue 11 Pages 29-35
    Published: November 01, 2000
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.38.11_29
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    The circulating flow for natural resources is recognized to be important topic at present. As for the concrete production in Japan, the technology using high quality recycled aggregate for structural concrete starts to be in use and it is just controlled in market now. This report is on the ground that the re-collect design and the human environmental design applied in other industries, and fundamental properties of some kinds of recyclable concrete considering the material design for structural concrete was investigated. In particular, it shows that the experimental investigations of mix proportion of the recyclable concretes for supplying cement and aggregate materials and the properties of model building which was applied completely recyclable concrete for the first time in Japan practically.
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  • Several Issues in Designing Durable RC Structures
    T. U. Mohammed, N. Otsuki, H. Hamada, H. Watanabe
    2000 Volume 38 Issue 11 Pages 36-41
    Published: November 01, 2000
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.38.11_36
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    From the observations during laboratory and field investigations on concrete specimens, the following issues are seemed to be considered to improve the durability of concrete structures : (1) How to remove the gaps from the steel-concrete interfaces? (2) Is it possible to defined the chloride threshold value with the presence of interfacial gaps at the steel-concrete interface? (3) Is it possible to limit the rate of corrosion by limiting the crack width? and (4) As the micro-cracking in concrete causes to accelerate the rate of deterioration, therefore, is it possible to recommend the use of plain bar for structures, where the bonding requirements are not so significant?
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    2000 Volume 38 Issue 11 Pages 43-49
    Published: November 01, 2000
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.38.11_43
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  • [title in Japanese]
    [in Japanese]
    2000 Volume 38 Issue 11 Pages 50-55
    Published: November 01, 2000
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.38.11_50
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    2000 Volume 38 Issue 11 Pages 56-60
    Published: November 01, 2000
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.38.11_56
    JOURNAL FREE ACCESS
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