Concrete Journal

State-of-the-Art on Nondestructive Testing of Concrete

Toyoki Akashi, Shohji Amasaki

1985 Volume 23 Issue 12 Pages 11-20
Published: December 01, 1985
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.23.12_11

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There are many methods for nondestructive testing of concrete. This paper describes the available nondestructive tests for evaluation of existing concrete structures with regard to their strength and other properties and the future of nondestructive tests. The methods discussed include surface hardness and penetration tests, ultrasonic pulse velocity, break off, pullout and combined methods.

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Prevention of Deteriorating of Concrete Structure on Okinawa Expressway

K. Sasada, K. Hosoda

1985 Volume 23 Issue 12 Pages 21-27
Published: December 01, 1985
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.23.12_21

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The island of Okinawa is located in the most southern part of Japan is sole prefecture which belongs to the sub-tropical zone amongst all other Japanese prefectures. It is surrounded by ocean on all sides and atmospheric temperature as well as humidity is relatively very high throughout the year. In addition, numerous typhoons (tropical cyclones) hit the island almost every year. Under these circumstances, concrete structure in this area is perpetually affected by the particle of salinity, thus, put it under grave conditions in terms of saline water-deterioration surroundings. In order to cope with such situation as above, JHPC has prepared“Guideline for Design and Construction of Concrete Structure on Okinawa Expressway (Ishikawa-Naha)-Draft Version”in 1983 for the purpose of securing sufficient durability of concrete structure against deterioration caused by saline water. Construction of the Okinawa Expressway is now under processing in accordance with this Guideline. This Report shows surroundings of deterioration by saline water and some examples of saline water-deteriorated structure. On the other hand, some countermeasures for deterioration are also provided for the reader's reference in this Report.

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Construction of High Rise Apartment House using Reinforced Concrete Wall Frame Structure

U. Kuroiwa, H. Ikeda, T. Ishiwata, R. Okuno

1985 Volume 23 Issue 12 Pages 28-37
Published: December 01, 1985
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.23.12_28

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C.I. height Machida is a high-rise condominium building designed with reinforced concrete wall frame structure. Reinforced concrete wall structure features a comfortable living environment and high seismic-resistant ability, too. Furthermore, it reduces 20% of cost of structural work comparing with conventional steel and reinforced concrete structure. Concerning construction, a lot of features of structural frame are utilized to develop a construction system for cost reduction and good quality. This paper reports the planning and execution of this system.

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[title in Japanese]

[in Japanese]

1985 Volume 23 Issue 12 Pages 84-91
Published: December 01, 1985
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.23.12_84

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[title in Japanese]

[in Japanese]

1985 Volume 23 Issue 12 Pages 92-94
Published: December 01, 1985
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.23.12_92

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[title in Japanese]

[in Japanese], [in Japanese], [in Japanese], [in Japanese]

1985 Volume 23 Issue 12 Pages 117-133
Published: December 01, 1985
Released on J-STAGE: April 26, 2013

DOIhttps://doi.org/10.3151/coj1975.23.12_117

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