Concrete Journal
Online ISSN : 2186-2753
Print ISSN : 0387-1061
ISSN-L : 0387-1061
Volume 32, Issue 4
Displaying 1-8 of 8 articles from this issue
  • Test of Recycling within the Building
    Akito Kagawa
    1994 Volume 32 Issue 4 Pages 5-14
    Published: April 01, 1994
    Released on J-STAGE: April 26, 2013
    JOURNAL FREE ACCESS
    High economic growth not only generates a large volume of waste material and depletes the earth's limited natural resources, but also has a great effect on the environment. Resource conservation is a topic of serious concern. For this reason, it is necessary to reconsider materials previously thought of as waste, and try to find ways in which they can be re-used or recycled. In particular, re-use of waste materials generated during construction is still low, and this often results in illegal disposal. This paper describes a plan promoted by the Housing and Urban Development Corporation since 1992 as a means for dealing with the vast volume of concrete rubble and reducing the amount of waste generated during reconstruction of existing residential rental apartment buildings : the effective on-site re-use and recycling of waste material in a closed “within-the-structure” method.
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  • Nobuaki Otsuki, Makoto Hisada
    1994 Volume 32 Issue 4 Pages 15-21
    Published: April 01, 1994
    Released on J-STAGE: April 26, 2013
    JOURNAL FREE ACCESS
    There have been many papers on durability of concrete and concrete structures, including the effects of silica fume on durability of concrete. Through these investigations, the effectiveness of silica fume can be explained by the following two characteristics of silica fume ; (1) Very small particle size (Average diameter is less than 1 μ m), (2) Very high pozzolanic reactivity (Amorphous SiO2 content is more than 85 %). Influences of silica fume on the durability of concrete were described in this report on the basis of the characteristics of silica fume. Especially, “domestic” problems on silica fume were discussed in this report.
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  • Y. Taniguchi, T. Watanabe, O. Murata
    1994 Volume 32 Issue 4 Pages 22-30
    Published: April 01, 1994
    Released on J-STAGE: April 26, 2013
    JOURNAL FREE ACCESS
    The methods of pile of cast in place hold the majority all methods in execution of pile, because of the characteristic of that methods. But the quality of concrete of piles of cast in place is worse than the quality of the general structures of concrete. So we reduce the compressive strength of concrete piles, when we design the piles of cast in place. But we don't clearly know how much and why the strength declines. This report have purpose which we estimate the decline of strength of piles.
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  • H. Ikeda, T. Sato, H. Takemura, M. Nakano
    1994 Volume 32 Issue 4 Pages 31-39
    Published: April 01, 1994
    Released on J-STAGE: April 26, 2013
    JOURNAL FREE ACCESS
    Resistance to lateral loads in high-rise buildings are provided in a variety of different ways. The primary function of a core shear wall is to resist horizontal forces. In addition, it is used as load-bearing walls for gravity loads and as enclosures for elevator shafts, stairways or as large hollow columns. The wall for this project is constructed of reinforced concrete. On the other hand, the outer skeleton assembled around the core is constructed of structural steel. It is costeffective to use this combination of framing in view of structural design. The characteristics of this method are as follows : (1) Application of selfclimbing form makes the construction time shorter, (2) Reinforcing bars for core wall are assembled on the yard before erection. There are a lot of savings in labor time and construction cost.
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  • H. Okamoto, A. Tohno, T. Kanda, T. Kurosaka
    1994 Volume 32 Issue 4 Pages 40-53
    Published: April 01, 1994
    Released on J-STAGE: April 26, 2013
    JOURNAL FREE ACCESS
    Hiroshima Gas Co. Ltd. has decided to introduce LNG (Liquefied Natural Gas) as gas raw material, on the energy policy of Japanese government so as to promote long term security of material supply, uniformity of gas combution, security of customers and non environmental pollution. And a new factory of the company is now under construction at Hatsukaichi City, Hiroshima, Japan. In pit type LNG storage tank is to be constructed in the factory area and the type is the first application in Japan. This construction is a new type of installing “an aboveground LNG storage tank with double metal shell structure” in reinforced concrete pit executed in advance in ground. Therefore it can be considered to have combined technical characteristics of both aboveground Tank and inground Tank. Civil work portion (R. C. Pit) of abovementioned tank system has already been completed. This paper reports mainly on the design of concrete pit structure and the execution of concrete works.
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  • K. Teranishi, K. Eguchi, A. Nakagome, T. Imamura
    1994 Volume 32 Issue 4 Pages 54-63
    Published: April 01, 1994
    Released on J-STAGE: April 26, 2013
    JOURNAL FREE ACCESS
    Two hotels with concrete-filled steel tubular columns were constructed in Fukui. These columns were applied to eight layers above fifth floor at Grander-Hosen that has twelve floors, and six layers above third floor at Porthill-Hosen that has eight floors. The features of the execution method are using the concrete mixed with densified silica-fume and the casting method by pumping into steel tubular columns from a concrete pump on the ground. Prior to practice of work, we studied the mix proportion of concrete, and carried out pumping test with full scale steel tubular columns. In this report, the results of studies, the manufacturing and quality control method of concrete, in practice work and the results of casting these concrete are introduced.
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  • [in Japanese]
    1994 Volume 32 Issue 4 Pages 74-79
    Published: April 01, 1994
    Released on J-STAGE: April 26, 2013
    JOURNAL FREE ACCESS
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  • [in Japanese]
    1994 Volume 32 Issue 4 Pages 81-89
    Published: April 01, 1994
    Released on J-STAGE: April 26, 2013
    JOURNAL FREE ACCESS
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