Concrete Journal

WHAT IS THE CONCRETE FOR ARCHITECTS?

Toshihiko KIMURA

1980 Volume 18 Issue 8 Pages 3-13
Published: August 15, 1980
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.18.8_3

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Today, concrete is used only as a construction material in easy pattern without the interest of Architects or Engineers “Maker of Ready Mixed Concrete in JIS Standard→Transit Mixer→Pouring by Pump in situ.”
When we look back upon only a century of the use of this material, we can clearly see how engineers have studied and developed it materia-medically and statically and how architects have changed their viewpoints on this material. That is, at the beginning of the century, architects did not understand this material and refused to use it in place of masonry whereas now many architects appreciate this material as “Allmighty Material” or the “Saviour for today's Machine Civilization”.
Considering these facts, we feel that it is very important for architects how to find the new ways to utilize concrete in the future and for engineers to find ways to support them technically.

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EARTHQUAKE DAMAGE OF CONCRETE PILES

Toshio Shiga

1980 Volume 18 Issue 8 Pages 14-21
Published: August 15, 1980
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.18.8_14

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Serious attention has been directed forward the two incidences of heavy damage in the concrete pile foundations of high-rise apartment buildings which occured during the 1978 Miyagi-ken-oki earthquake. This paper reports the general features of the damage as well as gives a brief description of the repair work. Also discussed are the various problems concerning the seismic design of pile foundations based on the experience of the author. It is stressed that the upper building structure and the soilfoundation structure should be treated simultaneously under a consistent methodology in the seismic design and analysis of buildings.

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ENVIRONMENTAL MEASURES OF READY-MIXED CONCRETE PLANTS

Shinji Sekino

1980 Volume 18 Issue 8 Pages 22-29
Published: August 15, 1980
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.18.8_22

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There are some 5,000 ready-mixed concrete plants now in operation throughout Japan with variations in scales, equipment and environment. Thus, environmental pollution measures actually adapted by each plant are quite different.
This article covers the introduction of the Water Contamination Prevention Law and other restrictive codes as well as general policy trends, measures actually carried out, organizations for preventing pollutions, and future developments. It is noted in the article that measures now being taken by each plant are not always the same.

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PERFORMANCE OF NEWLY DEVELOPED CONTINUOUS MIXING VEHICLE FOR EMERGENCY WORK USING ULTRA RAPID HARDENING CEMENT CONCRETE

Hiroshi Uchikawa, Teruyuki Uto, Yasuo Endo, Koichi Tsutsumi

1980 Volume 18 Issue 8 Pages 30-38
Published: August 15, 1980
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.18.8_30

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The performance test of a newly developed continuous mixing vehicle was carried out. In this mixing vehicle, cement and aggregate are delivered from dump type bins and batched by rotary feeders. Water and admixtures are measured by flow meters. These materials are mixed by a pug type forced mixer. The test results are as follows:
(1) The batching and the mixer performance satisfy JIS specifications.
(2) The slump loss of fresh concrete is very small.
(3) Various strengths of hardened concrete made by this mixer are almost the same as that by forced mixer of batch type.

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ERECTION OF THE AKAYA-GAWA BRIDGE

-REINFORCED CONCRETE, INVERTED LANGER ARCH BRIDGE-

Kenji Ishikawa, Hirofumi Takayama

1980 Volume 18 Issue 8 Pages 39-56
Published: August 15, 1980
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.18.8_39

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The Akaya-gawa Bridge, now under construction, is a reinforced concrete, inverted Langer arch bridge crossing the River Akaya, a tributary of the River Tone and No.17 National Road within Tsukiyono Town of Gunma Prefecture.
The method of erection is a cantilever construction method with a special movable scaffold mounted on a main girder, erecting successively the main girder, arch ribs and vertical members, without using any support, which has been applied for the first time in the world. The order of erection is a cantilever construction using oblique hanging members to be a truss structure until jointing at the arch crown.
While cantilever construction goes on, backstays are provided and anchored to the foundation of neighbouring to prevent fall-down of arch piers due to unbalanced moments.
After completion of the bridge body, the backstays and oblique hanging members are removed.

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[title in Japanese]

[in Japanese]

1980 Volume 18 Issue 8 Pages 71-78
Published: August 15, 1980
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.18.8_71

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[title in Japanese]

[in Japanese]

1980 Volume 18 Issue 8 Pages 79-80
Published: August 15, 1980
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.18.8_79

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[title in Japanese]

1980 Volume 18 Issue 8 Pages 81-82
Published: August 15, 1980
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.18.8_81

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[title in Japanese]

[in Japanese]

1980 Volume 18 Issue 8 Pages 83-87
Published: August 15, 1980
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.18.8_83

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