Concrete Journal
Online ISSN : 2186-2753
Print ISSN : 0387-1061
ISSN-L : 0387-1061
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Volume 49, Issue 10
Displaying 1-20 of 20 articles from this issue
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  • Expansion Behavior of Alkali Silica Reaction of Siliceous Sedimentary Rock and Examination of New Restraint Measures
    E. Iwatsuki
    2011 Volume 49 Issue 10 Pages 10_9-10_15
    Published: 2011
    Released on J-STAGE: October 01, 2012
    DOIhttps://doi.org/10.3151/coj.49.10_9
    JOURNAL FREE ACCESS
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    This report arranged the result of the survey of the deteriorated structure by the alkali silica reaction of the siliceous sedimentary rock distributed in the Chubu region. In addition, the expansion behavior was experimentally examined by the test piece, and the feature of the alkali silica reaction of the siliceous sedimentary rock was arranged. Moreover, a new control method that added a small amount of chemical was examined. In the result, the alkali silica reaction of Aichi Prefecture in the Chubu region was a reaction of chert and siliceous slate of the siliceous sedimentary rock. And, it has been understood that the alkali silica reaction of the chert and siliceous slate continues for a long term. The restraint effect was obtained as a new restraint method by an easy method of adding a small amount of chemical.
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  • Development of I-Shape Steel Composite Slab
    N. Sakurai, H. Nakayama, M. Tamaki, A. Hayashi
    2011 Volume 49 Issue 10 Pages 10_16-10_21
    Published: 2011
    Released on J-STAGE: October 01, 2012
    DOIhttps://doi.org/10.3151/coj.49.10_16
    JOURNAL FREE ACCESS
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    In recent years, steel-concrete composite slabs are adopted to many bridges. But they are not specified in “Specification for Highway Bridges” in Japan. So it is necessary to verify the design to satisfy required performance of “Specification for Highway Bridges” in Japan. Therefore the authors carried out a static test and a wheel-tracking test for the slab on an intermediate support of continuous girders, and a fatigue test for welding between I-shape steel and floor plate, to ensure the endurance and the serviceability.
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