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Volume 36, Issue 9
Displaying 1-8 of 8 articles from this issue
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Proposal of JIS Development Plan for Performance-based Standard and InternationalizationS. Nagataki, K. Kokubu, Y. Tsuji, H. Kawano1998 Volume 36 Issue 9 Pages 3-7
Published: September 01, 1998
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSThe Divisional Council of Civil Engineering, Japanese Industrial Standards Committee, had reconsidered JIS standards for concrete which are specified mainly materials. In March 1998, the Divisional Council re-ported a Draft of JIS Development Plan. This plan is considered to harmonize the trend of international standardization of ISO and European countries. Futhermore, the plan is to develop JIS standards in order to provid more comprehensive outline of concrete, such as concrete structure, concrete, and its material, including precast concrete products, considering the future work of transforming into performance-based standard.View full abstractDownload PDF (909K) -
T. Nakamura, Y. Tanaka, K. Nakano, T. Yamamoto1998 Volume 36 Issue 9 Pages 8-14
Published: September 01, 1998
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSRecently, it is thought that the edge form of stirrups should be 180° hook or 135° hook, not 90° hook, to work after exfoliation of concrete cover. But, if these stirrups are used in plate structurs or in columns as conection reinforcements of hoop, it is complicated to construct. so, we proposed plate anchored stirrups and examined anchorage capacities of them and hooks after exfoliation of concrete cover. As a result, it was proved that the capacity of the plate anchored stirrup was greater than that of the 180° hook stirrup and plate anchored stirrups were efficient.View full abstractDownload PDF (4266K) -
M. Noda, T. Ogawa, W. Koyanagi, M. Kawamura1998 Volume 36 Issue 9 Pages 15-21
Published: September 01, 1998
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSThe investigations were carried out for the 40 bridges in which cracks were found on concrete members influenced by deicing salt. The items in the survey and examinations were compression test, static modulus of elasticity test, accelerated expansion test, analysis of substances exuded from expanded cores, rock classification of concrete aggregate, classification of minerals of the rocks by the use of the polarized microscope and powder diffraction analysis by x-ray, on cores extracted from the concrete structures. The content of chloride ion and alkalis was measured to detect influenses of NaCl as a deicing salt on the ASR damages. The results of investigations have made clear that most cracks were due to ASR caused by some aggregates. However, the reactivity of the aggregates in the concretes were found to be low from the results of the accelerated expansion test and the quantity of alkali in the concretes. It may be possible that the ASR damages in concrete were accelerated by the deicing salt and other causes.View full abstractDownload PDF (1234K) -
Y. Okuda, K. Matsumoto, T. Komura, T. Minato1998 Volume 36 Issue 9 Pages 22-27
Published: September 01, 1998
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSIn the Hokuriku region, de-icing salts have been increasingly used especially on the pavement of bridges in winter. As a result, there is a risk of combined deterioration, due to both the chloride induced corrosion of steel reinforcement in concrete and the cracking caused by alkali-sillica reaction (ASK) in concrete piers. In the rehabilitation of ASR damaged concrete piers, the influence of de-icing salts on the deterioration of concrete was investigated in detail. Based on the results of the laboratory and field test, the PC confined method which uses PC wires as a hoop reinforcement, has been applied as a seismic strengthening and rehabilitation one to the ASR damaged concrete piers in the Kumakigawa bridge in Ishikawa Prefecture. This paper describes the survey for ASR damaged concrete piers, and their rehabilitation design and construction methods.View full abstractDownload PDF (14175K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese]1998 Volume 36 Issue 9 Pages 28-34
Published: September 01, 1998
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSDownload PDF (6849K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese]1998 Volume 36 Issue 9 Pages 35-38
Published: September 01, 1998
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSDownload PDF (4005K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese]1998 Volume 36 Issue 9 Pages 39-42
Published: September 01, 1998
Released on J-STAGE: April 26, 2013
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]1998 Volume 36 Issue 9 Pages 43-46
Published: September 01, 1998
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSDownload PDF (10359K)
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