Concrete Journal
Online ISSN : 2186-2753
Print ISSN : 0387-1061
ISSN-L : 0387-1061
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Volume 52, Issue 10
Displaying 1-18 of 18 articles from this issue
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TOPICS
  • Overview of the Activities of the Research Committee on the Processing and Effective Use of Earthquake Debris (223rd Committee) of the Concrete Committee of the Japan Society of Civil Engineers
    M. Hisada, K. Kobayashi, T. Maruya, T. Kawai
    2014 Volume 52 Issue 10 Pages 863-870
    Published: 2014
    Released on J-STAGE: October 01, 2015
    DOIhttps://doi.org/10.3151/coj.52.863
    JOURNAL FREE ACCESS
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    The Japan Society of Civil Engineers launched “Research on the Processing and Effective Use of Earthquake Debris” as a key research topic in 2012. The committee in charge of this research topic was composed of concrete engineering and geotechnical engineering experts, who over a period of about one year, conducted flexible discussions across these two fields. Thereafter, to further pursue these activities, the Research Committee on the Processing and Effective Use of Earthquake Debris(223rd Committee)was established under the concrete Committee of the Japan Society of Civil Engineers. This paper presents an overview of the results achieved by this research committee over a period of about three years spent aggregating knowledge and findings on the processing and efficient use of the various disaster waste produced by the Great East Japan Earthquake.
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  • Summary of revision of “Standard Specifications for Concrete Structures - 2013, Test Methods and Specifications─JSCE Standards─”
    A. Ueno, T. Kamada
    2014 Volume 52 Issue 10 Pages 871-875
    Published: 2014
    Released on J-STAGE: October 01, 2015
    DOIhttps://doi.org/10.3151/coj.52.871
    JOURNAL FREE ACCESS
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    “Test Methods and Specifications” was published as a part of the “Standard Specifications for Concrete Structures” in November 2013 by the Japan Society of Civil Engineers Concrete Committee. Testing and verification are important activities for performance verification of concrete structures. As such, “Test Methods and Specifications” is important in each stage of design, construction, and maintenance of concrete structures. This article outlines the revised and newly included JSCE standards and test methods of other related organizations.
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  • Stipulation of Construction Products Regulation from Construction Products Directive in Europe
    Y. Tsuji, K. Matsui
    2014 Volume 52 Issue 10 Pages 876-883
    Published: 2014
    Released on J-STAGE: October 01, 2015
    DOIhttps://doi.org/10.3151/coj.52.876
    JOURNAL FREE ACCESS
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    The Construction Products Directive (CPD), which had been the framework for various European Standards (ENs) and CE marking, served for over 20 years before being amended into the Construction Products Regulation (CPR), which was endowed with high enforceability and took effect from July 1, 2013. This paper describes the history of the amendments from the CPD to the CPR and gives an overview of the CPR. With it high enforceability, the CPR is making significant contributions to the free flow of building products, including construction projects, in the European Union (EU) and the European Free Trade Association (EFTA) through the CE marking system. Furthermore, the CPR, which serves as the base for the establishment of related ISO standards, is having a significant impact also on Japan's quality standards for the mixing water for concrete, the production and quality of concrete, and PC grout quality and usage methods, as well as execution of concrete structures and quality standards for admixtures, additions, and aggregate.
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  • Construction and Quality Control of Superplasticized Concrete Controlled by Slump Flow for Main Structural Parts in Architectural Field
    Y. Furukawa, T. Oh-oka
    2014 Volume 52 Issue 10 Pages 884-891
    Published: 2014
    Released on J-STAGE: October 01, 2015
    DOIhttps://doi.org/10.3151/coj.52.884
    JOURNAL FREE ACCESS
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    In recent years, admixtures with viscosity agent have been developed and are increasingly being used, mainly in the field of civil engineering. In the construction sector, where many restrictions such as the Building Standards Law and JIS standards apply, on-site application requires consultation regarding concrete quality control and quality assurance for the required performance among the construction supervisors, ready-mixed concrete plants, and construction companies. This time, we had the opportunity to apply superplasticized concrete with viscosity agent controlled by slump flow to construction. This paper reports on the application processes and quality control involved when applying superplasticized concrete controlled by slump flow to main structural parts in buildings.
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  • Geosynthetic Reinforced Soil Integral Bridge
    S. Tamai, M. Koda, F. Tatsuoka
    2014 Volume 52 Issue 10 Pages 892-898
    Published: 2014
    Released on J-STAGE: October 01, 2015
    DOIhttps://doi.org/10.3151/coj.52.892
    JOURNAL FREE ACCESS
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    Bridges adjacent to embankments are traditionally built as a combination of abutments and bridge girders, but settlement of embankments and maintenance of bridge supports have been long-standing issues. As solutions, reinforced soil abutments that are integrated with abutment structures as reinforced earth embankments have been developed as a geotechnical approach, and integral bridges that integrate bridge abutments and bridge girders have been developed as a bridge engineering approach. However, neither of these approaches solves all the issues at hand. Geosynthetic reinforced soil integral bridges are a new type of bridge that combines reinforced soil abutments and integral abutments, thereby integrating abutments, bridge girders, and embankments. As such, compared with conventional abutments, they excel in terms of the support performance of bridge girders, earthquake resistance, maintenance characteristics, and economic efficiency. The present paper introduces the principles of geosynthetic reinforced soil integral bridges and construction cases.
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