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Predecessor
Volume 42, Issue 3
Displaying 1-8 of 8 articles from this issue
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S. Ushijima2004 Volume 42 Issue 3 Pages 3-13
Published: March 01, 2004
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSThe maintenance construction expense of existing facilities of maintenance, mending, repair, rehabilitation, retrofit, and replacement, etc. shows the tendency to increase in a lot of infrastructure maintenance businesses that public is high now at the time of change from the flow economy into the stock economy a social structure. Then, the decision of a new management technique by which the infrastructure stock is effectively used is hoped for. We are expected as this new management technique. The background, the problem of the introduction of asset management in the maintenance management, and the problem of the maintenance management of the concrete structure are described.View full abstractDownload PDF (14906K) -
M. Suzuki, K. Oyamada, T. Takahashi, K. Watanabe2004 Volume 42 Issue 3 Pages 14-20
Published: March 01, 2004
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSA large steel-making slag blocks were produced by carbonation process of steel-making slag. It was confirmed that these blocks were porous and the surface was covered with calcium carbonate. In this study, the possibility of using these blocks as a seaweed bed was investigated. As a result, these blocks were equal to concrete in the material characteristic and the hydraulic characteristic, and excellent in the algae creation effect. It was shown that the steel-making slag blocks using carbonation process were useful materials for marine plant cultivation beds and artificial reefs from these results.View full abstractDownload PDF (25220K) -
K. Kimura, T. Shioya, H. Nakazawa, Y. Higuchi2004 Volume 42 Issue 3 Pages 21-29
Published: March 01, 2004
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSSince the Hyogo-ken Nanbu earthquake, earthquake-resistant design regulations have become more strict. In the case of civil structures, the amount of shear reinforcement have increased. In the case of high-rise buildings, by using high-strength concrete, while the rebar arrangements of beam-column connections have become overcrowded. To improve the overcrowded rebar arrangement, the T-headed bar construction method was developed. This method has a good constructability in comparison with a conventional hook method. In this study, tests were conducted using T-headed bars. And also, constructability tests were conducted. Examples of construction are shown.View full abstractDownload PDF (34009K) -
K. Yokoyama, G. Ohashi, T. Matsuda, M. Aoyama2004 Volume 42 Issue 3 Pages 30-37
Published: March 01, 2004
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSThe Oyashirazu coastal viaduct is a PC bridge constructed along the coast of the Sea of Japan in a severe saline environment. In the construction of this bridge, some countermeasures against salt damage such as increasing the cover depth of steel bars, coating the surface of the concrete, epoxy-coated reinforcing steel bars and waterproofing of the slabs were adopted. About 15 years have already passed since this bridge was constructed. Therefore we conducted the follow-up surveys and monitoring of the countermeasures. From the results, it has been found that chloride ion penetrability of concrete is reduced due to lower water-cement ratio, and that epoxy-coated reinforcing steel bars in this bridge are sound. Also, it is clarified that the waterproof sheet can prevent against salt penetration of this slab.View full abstractDownload PDF (27645K) -
K. Takewaka2004 Volume 42 Issue 3 Pages 38-47
Published: March 01, 2004
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSShirasu concrete is defined as a concrete using Shirasu as fine aggregate. Shirasu is a kind of pyroclastic flow deposits and the huge volume of it accumulates in the southern part of Kyushu island, Japan. Its particles can effectively react as Pozzolan in concrete to produce durable one, although Shirasu is classified into the nonstandard aggregate because of its lower specific gravity, higher water absorption ratio and large content of the fine powder. In this report, characteristics of Shirasu concrete and its mixture design method are briefly mentioned and they are followed by an explanation of newly developed self-compacted concrete with Shirasu. Furthermore, the author introduces some activities for practical use of Shirasu concrete in Kagoshima prefecture, including the first trial of a real construction of the concrete in the foundation of bridge structure constructed in hot spring environment.View full abstractDownload PDF (29695K) -
[in Japanese], [in Japanese], [in Japanese]2004 Volume 42 Issue 3 Pages 49-54
Published: March 01, 2004
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSDownload PDF (26957K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese]2004 Volume 42 Issue 3 Pages 55-60
Published: March 01, 2004
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSDownload PDF (32092K) -
[in Japanese], [in Japanese], [in Japanese]2004 Volume 42 Issue 3 Pages 78-80
Published: March 01, 2004
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSDownload PDF (649K)
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