Concrete Journal
Online ISSN : 2186-2753
Print ISSN : 0387-1061
ISSN-L : 0387-1061
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Volume 45, Issue 8
Displaying 1-6 of 6 articles from this issue
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  • Lessons learned from the Earthquake Damages of Reinforced Concrete Building Structures in the Light of the International Point of View
    T. Shimazu
    2007 Volume 45 Issue 8 Pages 3-11
    Published: August 01, 2007
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.45.8_3
    JOURNAL FREE ACCESS
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    This paper reviews the earthquake damages of reinforced concrete buildings structures for a period of about one century from The 1906 San Francisco earthquake till The 1999 Chi-Chi earthquake, in the light of the international point of view. It has been found that the problem of shear failure of short columns, which had been obvious since The 1968 Tokachi-oki earthquake in Japan becomes much more serious, because most of recent earthquake damages of tall buildings are due to the failures of short columns under combined high stresses of shear and high axial force. Finally, a proposal has been made on an alternate solution to these issues, including the problem of the anchoring of longitudinal reinforcement to beam-column joints. This is based on the design philosophy of deformation capability of building structures with required yield strength determined from displacement response spectra, which requires appropriate structural layout of both longer columns and shear walls in architectural spaces.
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  • Present Situation and Outline of revised JIS marking System
    K. Seto
    2007 Volume 45 Issue 8 Pages 12-15
    Published: August 01, 2007
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.45.8_12
    JOURNAL FREE ACCESS
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    Outline of change on new JIS marking systems started from 1st of October 2005, according to revise of Industrial Standardization Law. Including change of design for JIS mark, flow chart of new JIS marking systems from application to certification, situation of JIS mark certification, effect of new systems, and so on.
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  • Manufacture of very Low-grade Concrete using Demolished Concrete Debris and Industrial By-products for the Purpose of Minimizing the Environmental Load
    Y. Ishikawa, T. Sakurai, H. Kimura, Y. Sakazume
    2007 Volume 45 Issue 8 Pages 16-24
    Published: August 01, 2007
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.45.8_16
    JOURNAL FREE ACCESS
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    Until recently, most of the concrete debris obtained by the demolition of concrete structures has been used as base course materials, In recent years, more and more volumes of such debris are used as concrete aggregate after being subject to advanced treatments, which remove the mortar from the surface of the aggregates. This report provides a technical proposal of a new recycling method using the demolished concrete debris and industrial by-products with the purpose of minimizing the environmental load and provides a technical statement on the results of this method adopted in practice in a concrete construction work. The technical proposal provides the application method for the aggregate of the low-grade concrete with a compressive strength of several N/mm2 while enabling the effective use of industrial by-products. An adoption of these technical proposals in an actual site allowed not only the manufacture and use of concrete satisfying the target quality, but also the realization of recycling of approximately 11,500 tons of demolished concrete debris and significant reduction of the environmental load.
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  • Study on Environment-conscious CFT using Eco Cement
    S. Koda, H. Jinnai, M. Ohkura
    2007 Volume 45 Issue 8 Pages 25-32
    Published: August 01, 2007
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.45.8_25
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    Applicability of high fluidity concrete using eco cement to environment-conscious CFT was examined. As a result, the following conclusions were obtained. (1) The high fluidity concrete can be made by using eco cement. (2) Core strength and pumpability of high fluidity concrete using eco cement is almost the same as the case to use ordinary portlandcement. (3) High fluidity concrete using eco cement has almost the same corrosion resistance performance as the concrete using ordinary portlandcement with W/C=50%.
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  • [title in Japanese]
    [in Japanese], [in Japanese], [in Japanese], [in Japanese]
    2007 Volume 45 Issue 8 Pages 34-39
    Published: August 01, 2007
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.45.8_34
    JOURNAL FREE ACCESS
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    [in Japanese]
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  • [title in Japanese]
    2007 Volume 45 Issue 8 Pages 61-83
    Published: August 01, 2007
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.45.8_61
    JOURNAL FREE ACCESS
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