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Volume 45, Issue 7
Displaying 1-9 of 9 articles from this issue
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T. Noguchi, A. Koyama, Y. Suzuki2007 Volume 45 Issue 7 Pages 5-12
Published: July 01, 2007
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSUtilization of recycled aggregate has been of great interest to researchers and engineers in construction fields and remarkable progress in research on its property as a construction material has also been obtained recently. However, for promoting more usage of the recycled aggregate for construction, standardization on its quality is indispensable. Therefore, Japanese Industrial Standard of recycled aggregate and recycled concrete using recycled aggregate was stipulated from 2005 to 2007. This paper reports on the overview of the Japanese Industrial Standards.View full abstractDownload PDF (1546K) -
Y. Tsuji2007 Volume 45 Issue 7 Pages 13-18
Published: July 01, 2007
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSInternational Standard ISO 22965 concerning to production and conformity of concrete has been prepared by Sub-committee 3, Production and Execution of Concrete Structure in ISO/TC71, Concrete, Reinforced and Prestressed Concrete from a reactivation of SC3 at 1998. The FDIS voting was closed at February of 2007 and was gotten approval from almost all participating member bodies. This Code becomes essential for the International harmonization process of our Japanese Codes of concrete productions. Basic contents and a background of ISO 22965 are described. Not only an application scope of standard, exposure classes, three concrete classes, consistence classes and strength classes but also an evaluation system of conformity are focused on. It may be thought that the evaluation system of conformity is to be transferred to new JIS Mark system at 2005.View full abstractDownload PDF (9444K) -
K. Morihama, T. Shinozaki2007 Volume 45 Issue 7 Pages 19-24
Published: July 01, 2007
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSProblems that occurred since the 1980s with the durability of concrete structures need a method capable of directly evaluating the concrete quality in structures. The BOSS method may meet this requirement and the outline of the NDIS 3424 standard, constituted in November 2005 by the Japanese Society for Non-Destructive Inspection, “Method of making and testing for compressive strength of BOSS specimens” is outlined.View full abstractDownload PDF (28107K) -
C. Hashimoto, N. Sakata, T. Shindoh, T. Yoshikane2007 Volume 45 Issue 7 Pages 25-30
Published: July 01, 2007
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSQuality problems in constructed concrete structures has been focused in society. These problems were mainly led by increasing unit water amount in concrete mix proportion due to pumping concrete construction, and poor casting technique by immature labors in sites. Increasing amount of steel reinforcement in structures also prevented from properly casting concrete. To solve these problems, JSCE just published “Recommendation for Mix Design of Fresh Concrete and Construction Placement related Performance Evaluation” in March of 2007. This recommendation involves quantitative evaluation scheme of fresh concrete workability and resulting mix proportion design method. Furthermore, proper construction procedure according to targeted members like walls and columns are indicated in the recommendation.View full abstractDownload PDF (14737K) -
K. Watanabe, K. Yokozeki, T. Torichigai, N. Sakata2007 Volume 45 Issue 7 Pages 31-37
Published: July 01, 2007
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSThe durability of cementitious material can be effectively improved by reducing permeability and by changing cement hydrates to a less soluble matrix. This paper describes the chemical and the mechanical properties of carbonated new cementisious materials containing belite-rich cement and γ-2 CaO·SiO2 as main components in order to evaluate the superiority to normal portland cement. Moreover, the renovation method using this high durability concrete is introduced.View full abstractDownload PDF (30078K) -
S. Baba, H. Sasai, T. Morita, H. Nozaki2007 Volume 45 Issue 7 Pages 38-45
Published: July 01, 2007
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSThe paper first summarizes the findings from loaded heating tests of prestressed slabs made of ultra-high strength fiber reinforced concrete (UFC). Based on the test results, a design procedure was developed for estimating the fire resistance of UFC slabs, taking into account the temperature rise and loss of strength of prestressing steel, both induced by heating during fires. Furthermore, the report provides a brief overview on the process of fabrication and installation of the UFC slabs for the enlargement and refurbishment project of an existing office building in Yokohama, Japan.View full abstractDownload PDF (35219K) -
M. Sakurada, H. Ohyama, T. Mori, J. Niwa2007 Volume 45 Issue 7 Pages 46-53
Published: July 01, 2007
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESSHigh strength fiber reinforced mortar was developed and its applicability for towers and low height bridge girders was studied. Various material experiments and the loading experiments of tower and girder specimens were conducted. As a result, it showed that it is possible to construct the towers and low height bridge girders by high strength fiber reinforced mortar. High strength fiber reinforced mortar was already applied to the low height bridge girders and towers. In addition, it can be economically applied to the prestressed concrete structures whereas ordinary concrete cannot be adopted.View full abstractDownload PDF (29275K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese]2007 Volume 45 Issue 7 Pages 55-62
Published: July 01, 2007
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESS -
[in Japanese], [in Japanese], [in Japanese], [in Japanese]2007 Volume 45 Issue 7 Pages 63-69
Published: July 01, 2007
Released on J-STAGE: April 26, 2013
JOURNAL FREE ACCESS
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