Concrete Journal
Online ISSN : 2186-2753
Print ISSN : 0387-1061
ISSN-L : 0387-1061
Search
Advanced search
OR
Browse
Search
Volume 28, Issue 5
Displaying 1-8 of 8 articles from this issue
Show all abstracts
    • |<
    • <
    • 1
    • >
    • >|
  • Present State and Prospect on Maintenance and Management of Concrete Structures
    Civil Engineering Field
    Manabu Fujii
    1990 Volume 28 Issue 5 Pages 12-21
    Published: May 01, 1990
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.28.5_12
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    This paper describes the present state and prospect on the maintenance and management of concrete structures in the fields of Civil Engineering. First, the present state is shown on the methods of inspection, sound evaluation, repair and strengthening and surveying after remendance which have been adopted or proposed by public organizations or institutions. Next, some problems included in the present methods of daily, periodical, incidental or detailed inspection are pointed out. Moreover, ideal methods of maintenance and management are indicated together with the problems to be solved hereafter for establishment of them.
    View full abstract
    Download PDF (1460K)
  • Present State and Prospect on Maintenance and Management of Concrete Structures
    Buildings
    Yoshihiro Masuda
    1990 Volume 28 Issue 5 Pages 22-29
    Published: May 01, 1990
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.28.5_22
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    As reinforced concrete buildings are thought to be maintenance-free, little consideration has been given to the maintenance of reinforced concrete structures. However, much attention should be given to maintenance of buildings for service life of buildings are relatively long compared with machines and facilities. This paper presents the legal ground for the maintenance of buildings and outlines “The guideline for the maintenance of reinforced concrete buildings” which has been published as the result of the project of Ministry of Construction and some appropriate maintenance methods are suggested to apply to the reinforced concrete buildings with finishing materials.
    View full abstract
    Download PDF (1300K)
  • Alkali-Aggregate Reaction, Now
    Shinzo Nishibayashi
    1990 Volume 28 Issue 5 Pages 30-40
    Published: May 01, 1990
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.28.5_30
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Recently, cracking damage to concrete structures due to alkali-aggregate reactions (AAR) have been increasingly throughout the world. Active investigation and research on AAR started in our country in the early 1980 's. A number of research organizations have dealt earnestly with the difficult AAR problem for about ten years now, and the level of research in our country has come lately to rank among the world. Fifty or more experimental results on AAR were reported every year in the annual meeting held by AIJ, JSMS, JCI, the Cement Association, or other societies or associations. Also, 134 reports were presented and about 400 persons were attended in the 8th International Conference on Alkali-Aggregate Reaction (8th ICAAR) held in Kyoto, 1989. This paper reviews various aspects of the latest research on AAR, including such basic studies as the mechanisms of AAR, the microstructure of reaction products and petrographic study, effect of mineral and chemical admixtures on AAR, standard and new testing methods, preventive measures for AAR, and inspection and repair of damaged concrete structure due to AAR.
    View full abstract
    Download PDF (1679K)
  • Some Special Aspects to be Considered in Designing Reinforced Concrete Structural Members with High Strength Reinforcements
    Use of high strength re-bars for shear reinforcements
    H. Takagi, R. Tanaka, Y. Kanoh
    1990 Volume 28 Issue 5 Pages 41-48
    Published: May 01, 1990
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.28.5_41
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    Recently, the use of high-strength reinforcement is being actively developed to reduce the amount of re-bars and the size of members, which is beneficial to design the higher structures and the structures having longer span length. This report describes the shear behavior of reinforced concrete members with high-strength reinforcements as shear reinforcement, based on the test results conducted by the authors as well as those published in previous literatures. The paper consists of three parts; (1) shear strength of beams and columns reinforced by high-strength web-reinforcements, (2) effect of high-strength shear reinforcements on the ductility of members after flexural yielding, (3) effect of high-strength re-bars as shear reinforcements of shear walls.
    View full abstract
    Download PDF (1291K)
  • Construction Method for Reinforced Concrete Multi-Curved Surface Structure and Rationalization of Construction Work by Using of CAD
    Hokkaido Dai-Kannon (The Statue of Goddess of Mercy in Hokkaido) Project
    R. Hamade, M. Mukouyama, K. Hashimoto, S. Yuhara
    1990 Volume 28 Issue 5 Pages 49-58
    Published: May 01, 1990
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.28.5_49
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    With regard to construct the statue of goddess of mercy by reinforced concrete structure, it is most important how to enlarge and reproduce the shape of statue, which consists of complicated curved surfaces, with complete fidelity as an original model. It is usual not to illustrate the details of statue in design drawings by using of detailed drawings and dimensions. Therefore, a fundamental work for construction is to measure the original model accurately. In this report, the authors introduce the outline of construction method for the statue of goddess of mercy and how to use CAD in the stage of construction.
    View full abstract
    Download PDF (4464K)
  • Pumping up of High Strength Concrete (σck=600kgf/cm2)
    Tower of Aomori Ohashi Bridge
    T. Ishibashi, H. Yoshida, M. Ohba, K. Takeuchi
    1990 Volume 28 Issue 5 Pages 59-70
    Published: May 01, 1990
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.28.5_59
    JOURNAL FREE ACCESS
    Show abstractHide abstract
    The main tower of the bridge is designed to aptly high strength concrete (σck=600kgf/cm2).The concrete is pumped up to the tower which finally reaches to appx. 80 m in height. New type of superplasticizer is used in oder to obtain enough workability to pumping up; and unit weight of water is reduced to 135 kg/m3 as a result. From the viewpoint of construction, there are two main important factors to success. First is to control the quality of high strength concrete by using superplasticizer, and second is to make certain of pumpability of such concrete. This paper reports the concrete quality and the results of measurements which obtained from actual construction.
    View full abstract
    Download PDF (2017K)
  • [title in Japanese]
    [in Japanese]
    1990 Volume 28 Issue 5 Pages 84-89
    Published: May 01, 1990
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.28.5_84
    JOURNAL FREE ACCESS
    Download PDF (910K)
  • [title in Japanese]
    1990 Volume 28 Issue 5 Pages 90-92
    Published: May 01, 1990
    Released on J-STAGE: April 26, 2013
    DOIhttps://doi.org/10.3151/coj1975.28.5_90
    JOURNAL FREE ACCESS
    Download PDF (488K)
    • |<
    • <
    • 1
    • >
    • >|
feedback
 Top