Concrete Journal
Online ISSN : 2186-2753
Print ISSN : 0387-1061
ISSN-L : 0387-1061
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Volume 53, Issue 6
Displaying 1-14 of 14 articles from this issue
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  • Revision of AIJ “Recommendation for Practice of Mix Design of Concrete”
    Y. Masuda, T. Kage, H. Jinnai
    2015 Volume 53 Issue 6 Pages 521-526
    Published: 2015
    Released on J-STAGE: June 01, 2016
    DOIhttps://doi.org/10.3151/coj.53.521
    JOURNAL FREE ACCESS
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    The “Recommendation for Practice of Mix design of Concrete” published by the Architectural Institute of Japan was revised in February 2015 after almost fifteen years. This revision was carried out to achieve consistency with the revision of JASS 5 (2009). This recommendation also covers mix design methods that take into particular consideration performance specifications. This paper gives an overview of this latest revision of the “Recommendation for Practice of Mix design of Concrete”.
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  • Establishment and Content of ISO 16311 Maintenance and Repair of Concrete Structures —General Overview and Part 1: General Principles—
    K. Takewaka, T. Ueda
    2015 Volume 53 Issue 6 Pages 527-534
    Published: 2015
    Released on J-STAGE: June 01, 2016
    DOIhttps://doi.org/10.3151/coj.53.527
    JOURNAL FREE ACCESS
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    ISO 16311: Maintenance and repair of concrete structures was established in April 2014. This is the first international standard that covers the maintenance and repair of concrete structures. ISO Technical Committee 71 Subcommittee 7, which prepared this standard, was established and operated through a joint proposal by Japan and Korea, and thus ISO 16311 constitutes an Asia-originated ISO standard. Over the process of its creation, numerous discussions were held taking into account the current state of maintenance and repair practices in Europe, and U.S., and various other countries and regions, during lasted ten years. ISO 16311 consists of four parts, namely Part 1: General principles, Part 2: Assessment of Existing Concrete Structures, Part 3: Design of Repairs and Prevention, and Part 4: Execution of Repairs and Prevention. This paper provides an outline of the process leading to the establishment of this ISO standard and the content of Part 1 of this standard.
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  • Evolution of Crack Control Technology in Reinforced Concrete Side Walls of Near Surface Disposal Facilities
    S. Kudou, H. Yanokura, T. Maruya, Y. Tsuji
    2015 Volume 53 Issue 6 Pages 535-541
    Published: 2015
    Released on J-STAGE: June 01, 2016
    DOIhttps://doi.org/10.3151/coj.53.535
    JOURNAL FREE ACCESS
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    The reinforced concrete side walls of underground disposal facilities require suppression of the occurrence of harmful cracks that reduce water-tightness in order to prevent the ingress of rainwater and groundwater and any leaching out. This report presents the findings of a study on the effectiveness of concrete mix proportions improvements and the use of crack control reinforcement for suppressing cracks caused by temperature changes due to the heat of hydration of cement and drying shrinkage, by assessing the various control methods through comparison of the initial predictions and the cracks that occurred in actual structures over a period of twenty years.
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  • Flexural Crack Behaviors of Partially Prestressed Concrete Beams with Different Bond Performance
    Y. Tsuji, C. Li, C. Hashimoto, K. Suhara
    2015 Volume 53 Issue 6 Pages 542-550
    Published: 2015
    Released on J-STAGE: June 01, 2016
    DOIhttps://doi.org/10.3151/coj.53.542
    JOURNAL FREE ACCESS
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    This paper reports the experimental results obtained for the flexural crack behavior of partially prestressed concrete (PPC) beams manufactured with either the post-tensioning method or the pre-tensioning method. The beams were designed with various compressive strength of 100 N/mm2, 70 N/mm2, and 35 N/mm2. The bond performance between the concrete and the prestressing-steel strands or PC steel bars in post-tensioned PPC beams of various PC grout quality levels, including unbonded grout, and pre-tensioned PPC beams, was found to have a major influence on the flexural crack behavior of PPC beams. Further, with regard to the PPC beams that use high-strength concrete of 100 N/mm2 class, post-tensioned PPC beams filled with high-strength PC grout were found to exhibit more desirable flexural crack behavior than pre-tensioned PPC beams. This paper also touches upon the applicability of the flexural crack width calculation formulas given in the Standard Specifications for Concrete Structures of the Japan Society of Civil Engineers.
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