Concrete Journal
Online ISSN : 2186-2753
Print ISSN : 0387-1061
ISSN-L : 0387-1061
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Volume 54, Issue 6
Displaying 1-15 of 15 articles from this issue
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  • Improvement in Durability of Glass-Fiber Reinforced Residual Forms
    K. Seki, K. Yokozeki, A. Mukaibara, A. Fujiki
    2016 Volume 54 Issue 6 Pages 607-612
    Published: 2016
    Released on J-STAGE: June 01, 2017
    DOIhttps://doi.org/10.3151/coj.54.6_607
    JOURNAL FREE ACCESS
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    The authors developed an eco-friendly concrete that fixes a large amount of carbon dioxide in the hardened cement paste through use of the carbonation reaction of concrete. Preparation of highly durable glass fiber-reinforced mortar is possible by virtue of the neutral pH characteristic of said concrete as the result of carbonation. The applicability of this glass fiber-reinforced mortar for residual forms was investigated from the viewpoints of strength and durability. The results show that compared with regular glass fiber-reinforced mortar, the newly developed mortar offers superior strength and durability, and thus it is deemed suitable for use for residual forms.
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  • Remote Monitoring System Used Tablet PC for Economical Way of Maintenance to Cathodic Protection
    T. Kamotani, T. Aoyama, N. Fukagawa, K. Ishii
    2016 Volume 54 Issue 6 Pages 613-620
    Published: 2016
    Released on J-STAGE: June 01, 2017
    DOIhttps://doi.org/10.3151/coj.54.6_613
    JOURNAL FREE ACCESS
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    The cathodic protection with impressed current has been used against concrete structures deteriorated due to steel corrosion. The maintenance to cathodic protection is important because of influence to durability of structures. Unfortunately, lack of protection engineers and high cost were the cause of inappropriate maintenance and earlydeterioration of structures. The authors have proposed the way of maintenance used the automatic measuring device and the remote monitoring one. This paper discusses the new remote monitoring system used Tablet PC, the application to some type of structures and the future plans of usage.
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  • Study on Thermal Cracks of Concrete Structures Based upon Probability Theory
    M. Yurugi, M. Ishikawa
    2016 Volume 54 Issue 6 Pages 621-627
    Published: 2016
    Released on J-STAGE: June 01, 2017
    DOIhttps://doi.org/10.3151/coj.54.6_621
    JOURNAL FREE ACCESS
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    It is important to evaluate beforehand how width of cracks which generate on concrete structures for its durability. How influence the amount of scatter in construction conditions and material properties to the variance of width of thermal cracks were discussed by using of FEM analysis based upon probability theory. As the results of simulations, width of the cracks will vary about ±0.2 mm according to the variation of construction conditions and material properties. Besides, to control the width of the cracks by rebar, the quantitative relationship between amount of rebar and crack width were shown.
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