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Home > Publications > International Concrete Abstracts Portal
Showing 1-5 of 33 Abstracts search results
Document:
SP109
Date:
August 1, 1988
Author(s):
Editor: V.M. Malhotra
Publication:
Symposium Papers
Volume:
109
Abstract:
SP109 The book offers information on a variety of subjects such as: The durability of concrete containing supplementary cementing materials; the durability and corrosion of reinforced concrete subjected to a marine environment; and the repair, design and construction of concrete structures in a marine environment. Whether you are building a new concrete structure in marine environment, or repairing an old one--as an engineer you need the wealth of information contained within the 32 papers presented in this important symposium volume.
DOI:
10.14359/14142
SP109-24
S. Nishibayashi, S. Inque ,and K. Yamura
Fatigue characteristics of concrete beams were determined under water and in air. Significant differences were observed in the fatigue strengths between the beams tested in water and those in air. The failure pattern of a reinforced concrete beam tested in water occurs as a shear failure but as flexural failure in air. At the same upper load level, the fatigue life of the beam with web reinforcement was approximately 100 times that of the beam without it. The flexural crack width of the specimen in water was lower than that exposed to air. At the same upper load level, however, the deflection and the rate of propagation of the diagonal crack were larger in air.
10.14359/2061
SP109-29
T. W. R. Taylor and H. R. Woodhead
The Port of Vancouver, Canada, is the owner of one of the world's newest and most unique heliports. This state-of-the-art floating facility is constructed from styrofoam-filled cellular concrete. The analysis and design of the structure is developed in this paper. Some of the interesting aspects of construction are highlighted and the economic benefits of this use of reinforced concrete are discussed.
10.14359/3054
SP109-20
P. F. Adams, T. J. E. Zimmerman, and J. G. MacGregor
The exterior walls of arctic oil and gas production structures will be subject to large, concentrated ice forces. Composite steel/concrete walls have been proposed as a cost-effective solution to resisting these forces. The research discussed in this paper has investigated the behavior and failure mechanisms of composite walls, so that recommendations can be made concerning analysis and design methods and effective construction details. The research involved the development of design-oriented ultimate strength models, as well as the physical testing of composite wall specimens. Results are presented in this paper for tests on composite beam and composite slab specimens. The high strength and great ductility of this form of construction is demonstrated. Effective design methods utilizing empirical design equations and limit analysis plasticity solutions are given.
10.14359/3075
SP109-02
V. M. Malhotra, G. G. Carette, and T. W. Bremner
Paper deals with the evaluation in marine environment of normal and lightweight concretes incorporating supplementary cementing materials. A series of 175 concrete prisms, 305 x 305 x 915-mm in size, were cast over a nine-year period starting in 1978 for long-term exposure at Treat Island, Maine. The prisms were positioned at mid-tide level on a rack at the entrance to the Bay of Fundy, which is perhaps the most severe marine exposure condition for concrete. The test specimens are exposed to repeated cycles of wetting and drying, and to an average of about 100 cycles of freezing and thawing per year. The test specimens are monitored at yearly intervals: the specimens are photographed and rated on a visual basis. Ultrasonic pulse velocity is also determined. After up to nine years exposure, both normal-weight and lightweight air-entrained concretes show no degradation of the mass of the concrete; however, some of the specimens show significant surface deterioration. The amount of deterioration generally increases with an increasing water-to-cementitious materials ratio, and increasing replacement of cement with slag and fly ash. It appears that surface deterioration can be avoided if the cement content is kept to at least a certain minimum level. The tests confirm that over long exposure duration, non air-entrained concrete is not durable in this environment.
10.14359/1912
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