Concrete Journal
Online ISSN : 2186-2753
Print ISSN : 0387-1061
ISSN-L : 0387-1061
Volume 47, Issue 12
Displaying 1-13 of 13 articles from this issue
  • R. Sato, S. Sogo, T. Kanazu, T. Kishi, T. Noguchi, T. Mizobuchi, S. Mi ...
    2009 Volume 47 Issue 12 Pages 12_3-12_9
    Published: 2009
    Released on J-STAGE: March 27, 2012
    JOURNAL FREE ACCESS
    The guideline published from JCI in 1986 was newly revised. In two decade, thermal stress analysis technologies, concrete materials and construction technologies have been developed remarkably, but recently as part of enhancing quality of mass concrete, crack control is more required. The revised guideline includes the advanced technologies in design and construction fields of mass concrete. The guideline is composed of six chapters including basic provisions and those commentaries, twelve reference materials, one analyzed example of thermal cracking by 3 D-FEM and six performance verification examples of thermal cracking of typical mass concrete structures. This report introduces an outline of “Guideline of Practice for Cracking Control in Mass Concrete 2008”.
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  • M. Ohno, T. Katayama, E. Nagai, T. Maeda
    2009 Volume 47 Issue 12 Pages 12_10-12_17
    Published: 2009
    Released on J-STAGE: March 27, 2012
    JOURNAL FREE ACCESS
    To have the construction of anchor unnecessary which prolongs the term of works, causes a vibration, a noise, and dust, etc under construction, the brace that has the multilayer spring element at the edge with prestressed beforehand is set up in the existing frame, and it puts on pressure to the existing frame by liberating the prestress power afterwards. It detaches from the existing frame by introducing the prestress power again after it sets it up and it is possible to transfer it. About the force evaluation-proof, the performance confirmation examination was done, and the validity of the design formula was confirmed. In this report, it reports on the design approach, the performance confirmation examination, and the application example.
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  • R. Kasakura, M. Suzuki, F. Ojima, M. Ito, Y. Kato, T. Maki
    2009 Volume 47 Issue 12 Pages 12_18-12_25
    Published: 2009
    Released on J-STAGE: March 27, 2012
    JOURNAL FREE ACCESS
    The authors propose an emergency rapid retrofitting method utilizing fiber sheets containing hydraulic resin (TST-FiSH). The goals of this new method are to provide higher safety, speed, and ease of application compared to modern methods. The basic properties were evaluated by adhesion test, the repair effect was investigated by beam specimen, and the structural performance was confirmed by column specimen. As a result, in comparison with conventional fiber sheet wrapping method, TST-FiSH was confirmed that it can provide same repair effect on 1/10 application time. This paper reports these experiment results and the applicability of emergency rapid retrofitting method TST-FiSH.
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  • J. Kadoriku
    2009 Volume 47 Issue 12 Pages 12_26-12_32
    Published: 2009
    Released on J-STAGE: March 27, 2012
    JOURNAL FREE ACCESS
    Recently some construction of new buildings were interrupted by the depression. In such case many reinforcing bars are exposed in the air on the way to construction, and it is possible that their bars are covered with rust. This paper describes the results of exposure test on reinforcing bars which were exposed in the air. Tests carried out at four places for 2 years. Their places were Funabasi in Chiba, Nagareyama in Chiba, Setagaya in Tokyo, and Okinawa. We examined the states of rust on reinforcing bars, and the effect of some rust inhibitor.
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  • S. Ikeda, T. Kadotani, K. Hirai
    2009 Volume 47 Issue 12 Pages 12_33-12_37
    Published: 2009
    Released on J-STAGE: March 27, 2012
    JOURNAL FREE ACCESS
    Technical development with regard to concrete deck slab of highway bridges so far was firstly reviewed with emphasis on the durability against inherent severe loadings and environmental condition of a deck slab. Then, the recent trend and the significat effect of transverse prestressing in concrete slabs was described including the use of pre-grouted prestressing strands by means of delayed-hardening epoxy resin although urgent problems had been reported relating to the hardening process of the resin, etc.. To solve the prohlems, development and utilization of Multi-unbonded epoxy-coated strand cable for the use in transverse prestressing were proposed and discussed according to experimental results.
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