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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Showing 1-5 of 33 Abstracts search results
Document:
SP109-15
Date:
August 1, 1988
Author(s):
S. G. Millard
Publication:
Symposium Papers
Volume:
109
Abstract:
Coastal defenses in the United Kingdom have often been constructed using natural stone armor or plain concrete armor. This paper reports on the novel use of slender section reinforced concrete units in the marine splash zone. A program of monitoring the durability performance of the coastal defenses was commenced by the University of Liverpool in 1985. A visual survey together with electrical potential and resistivity monitoring of a sample of 51 units is conducted annually. Overall, the slender reinforced concrete units are performing very well both hydraulically and structurally. Some minor impact damage soon after construction has been easily repaired using the steel reinforcement as a bonding key. The results of three years of potential monitoring have shown that the steel reinforcement has been passivated in all but one of the sample units. The resistivity monitoring has shown that the fly ash concrete has a significantly higher resistivity than the ordinary concrete and hence; its use should lead to lower rates of corrosion. Further studies on the durability of reinforced concrete in the splash zone are in progress.
DOI:
10.14359/1996
SP109-25
H. Roper, J. L. Heiman, and D. Baweja
In Australia, the major population centers are located on the coast. A significant proportion of the nation's heavy industrial infrastructure and civil engineering work is also coastal. A wide variety of structures have been constructed in aggressive marine environments. Many of these structures have had long histories of durability problems and subsequent repair. Paper reports on field and laboratory studies that have been carried out to evaluate the performance of two wharf structures and their repair systems. It discusses the usefulness of various methods of detecting corrosion activity and considers the effects of chloride contamination and carbonation on damaged structures. Some aspects of repair materials for use in the marine environment are considered.
10.14359/2755
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
SP109-30
T. A. Holm, T. W. Bremner, and A. Vaysburd
Concrete ships and bridges incorporating structural lightweight concrete were examined for durability with particular attention given to depth of carbonation. The profile of the carbonation front was determined for these mature structures in or over sea water, and the carbonation front was found not to approach the steel reinforcing even after several decades of exposure. Factors affecting the rate of carbonation are discussed and recommendations are given to limit the extent of carbonation.
10.14359/2114
SP109-19
G. C. Hoff
The mechanism by which ice floes occurring in rivers, lakes, and oceans can damage concrete structures in the water is hypothesized. Various test methods to evaluate the effects of ice abrasion and impact on concrete are reviewed, and selected results using these methods are presented. Several field studies of the effects of ice abrasion on concrete structures are identified.
10.14359/3576
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