Concrete Journal
Online ISSN : 2186-2753
Print ISSN : 0387-1061
ISSN-L : 0387-1061
Search
Advanced search
OR
Browse
Search
Volume 50, Issue 3
Displaying 1-15 of 15 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • The Inspection of the Deterioration Factor and Examination of Durable Improvement Measures in the Upper Thickness Increasing Method for Slab Deck Reinforcement
    T. Nagatani, Y. Wada, A. Goto
    2012 Volume 50 Issue 3 Pages 245-253
    Published: 2012
    Released on J-STAGE: March 01, 2013
    DOIhttps://doi.org/10.3151/coj.50.245
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    In NEXCO, upper thickness increasing method has been commonly adapted for slab deck reinforcement, it is, however, reported that pavement deterioration arisen from de-bonding of the interface between actually RC slab and reinforced concrete cast by this method within several years after the cast, it is, therefore, required to know the causes and its de-bond provisions. The study presents the specific causes obtained by investigation and small specimen tests, and the provision effects followed by the wheel running fatigue test. As the results, pavement deteriorations are strongly affected by the deterioration level of the actual slabs, the de-bonding commonly occurred at the interface between actual slabs and newly cast concrete. It is concluded that adequate provision is required to keep superior bonding strength, and then RC slab reinforcement have to be executed with consideration of deterioration level of the RC slab, are important.
    View full abstract
    Download PDF (2801K)
  • Technical Development on Pretensioned PC Beam with Epoxy-Coated PC Strand for Salt Attach Region
    T. Oshiro, J. Tomiyama, K. Hirai
    2012 Volume 50 Issue 3 Pages 254-260
    Published: 2012
    Released on J-STAGE: March 01, 2013
    DOIhttps://doi.org/10.3151/coj.50.254
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    This paper presents the technical development on practical application of highly durable pretensioned PC beam with epoxy-coated PC strands for salt attach region. Bond performance of the PC beams is verified by the induced concrete stress at the transfer length just after prestressing. Also, bending tests for the PC beams with epoxy-coated PC strands and normal PC strands are presented and the results conclude that both beams have the same load carrying capacity.
    View full abstract
    Download PDF (2233K)
  • Seismic Risk Curve and NEL/PML Estimation of Concrete Structures—Basic Theory and Case Studies—
    H. Yoshikawa, T. Nakamura, T. Ohtaki
    2012 Volume 50 Issue 3 Pages 261-268
    Published: 2012
    Released on J-STAGE: March 01, 2013
    DOIhttps://doi.org/10.3151/coj.50.261
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Seismic risk analysis, enables quantitative evaluation of earthquake damage levels, is an indispensable technique for estimating life cycle cost(LCC) and probable maximum loss(PML) which are important indices for disaster prevention planning and business continuity program(BCP). This paper focused on seismic event risk curve and its integral representation ‘seismic risk curve’. Firstly, numerical and graphical definition of the seismic event risk curve and the seismic risk curve are presented. Secondly, several examples of the seismic event risk curves and the seismic risk curves applied to reinforced concrete structures are demonstrated as well as the future prospects.
    View full abstract
    Download PDF (1784K)
TOPICS
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top