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Predecessor
Volume 39, Issue 2
Displaying 1-8 of 8 articles from this issue
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S. Sogo, T. Kawai, S. Ushijima2001 Volume 39 Issue 2 Pages 3-7
Published: February 01, 2001
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSCold joint is one of troubles that are produced during constructing concrete structures. It damages the beauty and makes durability of concrete worse and also causes water leaking. This paper describes the influence Cold joint have on performance of structures and the causes of Cold joint outbreaks. This paper not only suggests the handy method of judgement in the site but also shows what is added special attention to and the prevention of Cold Joint when concrete is constructed.View full abstractDownload PDF (1084K) -
Efficient gathering, accumulating and using of dataH. Kawano, Y. Tanaka2001 Volume 39 Issue 2 Pages 8-13
Published: February 01, 2001
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSWhile it is recognized that detecting of rebar corrosion in concrete at early stage is vital, daily visual and hammering inspection cannot detect it. Therefore, suitable non-destructive testing (NDT) technologies should be included in periodic inspection. But NDT inspection cannot be adopted, if the advantage of introducing NDT is not shown for the administrator who even at the moment are facing shortage of budget and manpower at maintaining existing structures. In order to establish efficient and effective inspecting system, it is required to improve hardware of NDT as well as software of usage of NDT, for example, gathering, accumulating and using methods of NDT data. This paper shows the necessity of these supporting systems for introducing NDT and the direction of technology development.View full abstractDownload PDF (9044K) -
T. Watanabe, T. Mishima, M. Kitou2001 Volume 39 Issue 2 Pages 14-21
Published: February 01, 2001
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSSelf-compacting concrete with high strength and high durability has been on the practical stage as a technique extending the life span of structures. Self-compacting concrete with high strength and high durability is also called Super Quality Concrete (S.Q.C), which is defined as concrete with W/B less than 40%, expected compressive strength more than 60 N/mm2 and having self compacting workability. The new technical information about mechanical properties and durability performance of members combined Super-Quality-Concrete and deformed-bar with high strength more than 700 N/mm2 has been recently obtained through various experiments. Reflecting these experimental results, the guideline for design and construction has been almost completed and will be published soon. Advanced points of this guideline are 1) it is based on performance evaluation technique, 2) it includes Design, Construction, and Maintenance Manual, 3) an example of trial design is included as an appendix, and so on.View full abstractDownload PDF (7211K) -
K. Ishii, Y. Fujimoto, H. Hashimoto, K. Kanai2001 Volume 39 Issue 2 Pages 22-28
Published: February 01, 2001
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSRecently, the growth of economy in Japan is not expected. Therefore, it is necessary to construct shield segmental tunnel economically and effectively. PCNet segments which are prestressed concrete segments have some merits. They are to increase the load bearing capacity and to reduce the thickness and amount of reinforcement of segments. This paper discusses the assemblage and execution of PCNet segments. The real-size PCNet segments was prefabricated and they were assembled under real condition. The prestressing steel was prestressed in segmental tunnel and at ring joints. The performance of execution and assemblage of PCNet segments was estimated through this test.View full abstractDownload PDF (11321K) -
H. Okamoto, C. Kawashima, T. Koinuma2001 Volume 39 Issue 2 Pages 29-35
Published: February 01, 2001
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSWe have developed a new type of composite slab, which consists of prestressed precast decks and in-site reinforced concrete layer. The new composite slab has many advantages of strength, construction, economy and so on. This paper describes some experimental results on fatigue durability, feature of design and application to viaduct.View full abstractDownload PDF (12983K) -
A. Sumi, H. Kimura, M. Yamada, Y. Miyauti2001 Volume 39 Issue 2 Pages 36-42
Published: February 01, 2001
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSThis paper presents the new lap splices with headed anchor made by gas pressure welding for the center joint of the Pre-cast RC beams. Under the experimental studies that have the variables of splice length, strength of concrete, shear reinforcement, the way of main bar arrangement and the state of load, it is found that 15 db (db : diameter of main bar) is necessary for the lap splice minimum length and the ultimate bond strength of the splices is able to estimate.View full abstractDownload PDF (8369K) -
[in Japanese], [in Japanese]2001 Volume 39 Issue 2 Pages 44-47
Published: February 01, 2001
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSDownload PDF (11999K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese]2001 Volume 39 Issue 2 Pages 48-52
Published: February 01, 2001
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSDownload PDF (16190K)
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