Concrete Journal
Online ISSN : 2186-2753
Print ISSN : 0387-1061
ISSN-L : 0387-1061
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Volume 33, Issue 10
Displaying 1-8 of 8 articles from this issue
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  • Concrete Strength of Surface Layer
    N. Saeki, T. Horiguchi, T. Sugawara
    1995 Volume 33 Issue 10 Pages 5-12
    Published: 1995
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.33.10_5
    JOURNAL FREE ACCESS
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    Surface layer strength is important to assess not only the resistance to deterioration of the concrete surface, but also the in situ strength of concrete. Generally, the surface layer strength can be classified into two fracture patterns according to the depth of pressure parts and the distance from the pressure parts to the bearing support, namely, the mode I tensile fracture and Mode II shear fracture. The report mainly deals with the fracture mode I. The ratio of the surface layer strength to split tensile strength was approximately to 1.6 of the power of the ratio of depth to radius of the pressure part. The effect of the curing condition on the surface layer strength was much higher in concrete containing blended cement than in normal portland cement. The use of silica-fume and a special curing sheet was effective for increasing the strength. The general pull-out test proved to be a promising in test method for assessing the shear strength and compressive strength.
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  • The Concrete Engineering in the Society with Recycling System
    Takashi Idemitsu
    1995 Volume 33 Issue 10 Pages 13-21
    Published: 1995
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.33.10_13
    JOURNAL FREE ACCESS
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    Aiming at the establishment of the society with recycling systems, the law on waste recycling was enacted in Japan (1991). The concept of the law, its historical progress and the recycling materials designated in the law are commented in this paper. For the field of concrete engineering, the present situation and the future new trend of reusing methods of the recycling materials are described. Some promising attempts such as super workable concrete and the completely recyclable concrete, in which crushed limestone is used as coarse and fine aggregate, are also introduced.
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  • Field Demonstration Test on a Semi-Circular Caisson Breakwater
    H. Yamashita, K. Ishimatsu, S. Aburatani, H. Sasayama
    1995 Volume 33 Issue 10 Pages 22-29
    Published: 1995
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.33.10_22
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    The world's first semi-circular breakwaters have been erected at Miyazaki Port in Japan. This type of breakwater, having a hollow structure with a semi-circular cross section, is expected to exhibit superb characteristics in terms of sliding stability and low reflectivity under a severe natural environment that includes high waves and poor soil conditions. In addition, its unique design provides excellent scenery enhancement. Field demonstration tests by erecting test breakwaters have been conducted since 1991 at Miyazaki Port in an effort to verify stability, member safety and construction ease of the semi-circular breakwater in an actual sea area, as well as to establish practical design and construction methods.
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  • Construction of the Aoba Bridge
    K. Suzuki, S. Masuda, Y. Amano, T. Akizuki
    1995 Volume 33 Issue 10 Pages 30-36
    Published: 1995
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.33.10_30
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    Aoba Bridge is the concrete arch bridge, with a bridge length of 270 m and a arch span of 180 m, located in Takatiho-town Miyazaki Prefecture. As the construction method, combination truss and cica*6 construction method is adopted, that is the first application in Japan. Archring construction that was cast-in-place long segment was applied because of shortening of construction period. The bridge is now under construction. This reports outline the construction of the arch bridge.
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  • An Experimental Study on a Newly Proposed Connection Between a Steel Pier Base and a Cast-in-Place Pile with Manual Excavation for the Construction of Takaracho On-Ramp Viaduct at the Tokyo Metropolitan Expressway
    K. Izumi, H. Tominaga, M. Ogihara
    1995 Volume 33 Issue 10 Pages 37-47
    Published: 1995
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.33.10_37
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    For the past couple of years from February 1993 to February 1995, Tokyo Metropolitan Expressway Public Corp. had implemented the improvement work to squeeze the third traffic lane out over a length of 350 meter from Kyobashi Interchange to Takaracho On-Ramp at Anti-Clockwise Inner Circular Metropolitan Route.
    During the construction, the structure of Takaracho On-Ramp was changed into a pile-vent type viaduct to be connected with several T-shaped piers by a main box girder. The design of the connection between a steel pier and a cast-in-place pile with mannual excavation, however, was hard because a conventional anchor-frame could not be installed within the concrete of the pile due to the restriction of the pile size at the narrow construction site.
    Thus, it is proposed that main reinforcing bars of a cast-in-place pile themselves be used as anchor-bolts and that a base plate at the bottom of a steel pier be secured by both top and bottom bolt nuts. To examine the strength of this connection, ultimate strength tests were carried out considering the rigidity of a base plate and eccentricity of a steel pier due to the erection error. As a result, this new type of connection has been assured to satisfy the structural requirements.
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  • Color Concrete Construction Works in Trans?Tokyo Bay Highway (Kawasaki Overland Sections)
    Takashi Masuda
    1995 Volume 33 Issue 10 Pages 49-55
    Published: 1995
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.33.10_49
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    Japan Highway Public Corporation is serving to build the Kawasaki overland section, that is a part of the Trans-Tokyo Bay Highway whose total length is 15.1 km. This 300 m section has huge box culverts, U-shaped retaining walls, maintenace ramps and a rain reservoir. The wall of U-shaped retaining walls showing the image of the original stratuma is made from color concrete. This color concrete is superior in cost effeciency, maitenance, effectiveness to wards traffic safety and creative design. Althogh the traditional concrete coloration treats only the surface of concrete, this color concrete does the whole body. And the surface is chipped between four different color concrete layers to create the waving form after constructing the wall from the fresh concrete thrown pigment on the site. This works is the first tried in Japan civil construction objects. Therefore we would represent this report here.
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  • [title in Japanese]
    [in Japanese]
    1995 Volume 33 Issue 10 Pages 91-96
    Published: 1995
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.33.10_91
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  • [title in Japanese]
    [in Japanese]
    1995 Volume 33 Issue 10 Pages 97-98
    Published: 1995
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.33.10_97
    JOURNAL FREE ACCESS
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