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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 23 Abstracts search results
Document:
SP131-02
Date:
March 1, 1992
Author(s):
J. J. Basson and B. J. Addiss
Publication:
Symposium Papers
Volume:
131
Abstract:
Mechanisms of corrosion of concrete have been extensively studied and elucidated by various workers, but rate-determining factors have been neglected, as have the interactions between different corrodents. However, by considering all relevant influences as part of the total corrosive environment, it is possible to quantify aggressiveness as indexes and use them to select the appropriate technology for the circumstances under consideration.
DOI:
10.14359/1191
SP131-01
V. Ukraincik and D. Bjegovic
The greatest threat to the durability of reinforced concrete structures is the reinforcement corrosion. The paper presents the importance of the concrete protective cover and the conditions causing the reinforcement corrosion under the action of chlorides and carbonic acid. Processes of absorption, diffusion and flow, i.e. of transport of media through concrete depend on the pore system and the amount of water in the pores.Physical laws describing the penetration of aggressive agents into concre-te can serve as a basis for engineering calculations of reinforcement durability in the concrete as well as for the designing of the concrete cover. Physical laws and corresponding material parametars are briefly reviewed in the paper. For engineering purposes, in calculating the durability, four typical tasks can be solved. The processes of degradation depend on the pore system in the concrete structure, and the paper indicates some possible technological measures of structure modifications.
10.14359/10025
SP131
Editors: Jens Holm and Mette Geiker
SP131 The G. M. Idorn International Symposium on Durability of Concrete, sponsored by the ACI Committee 201 on Durability, was held at the 1990 annual ACI Convention in Toronto, Ontario, Canada. This symposium was dedicated to Dr. G. M. Idorn in view of his many decades of relentless dedication to the subject of improving concrete durability. A total of 32 paper are included in this publication. The volume has been divided into 4 parts, which all deal with the durability of cover. Part 1 covers durability aspects in relation to effects of environment on placement. Part 2 covers effects of composition. Part 3 deals with the assessment of durability, and in Part 4, various case histories are given.
10.14359/14163
SP131-20
R. Kristjansson and H. Olafsson
As the sole domestic building material in Iceland, concrete is widely used for house construction as well as for other construction, such as dams, bridges, and harbors. In Iceland, conditions are in many ways extreme: the climatic conditions are harsh, the cement is high in alkalies, aggregates are of varying quality (some being reactive), and codes and standards have been sparse. Field surveys have shown that alkali-aggregate reaction (AAR) damage occurs where no preventive measures were taken and other conditions were unfavorable. Preventive measures taken in dam and bridge construction have proven to be effective. No AAR damage has been found in constructions erected after 1979, when several preventive measures were taken. The most important one is 5 to 7+ percent replacement of cement with silica fume Stricter criteria have been enforced to secure freeze-thaw durability, and durability design is improving. Research in repair and maintenance methods has had considerable influence on the construction industry.
10.14359/1340
SP131-21
Arne Damgaard Jensen
Concrete roads have been in use in Denmark since 1923. Many of the old roads are still in use today and exhibit excellent durability. The Danish Technological Institute has investigated some of the old roads from the 1930s. The investigations include thin-section analysis of cores from the roads. This technique was used extensively by G. M. Idorn during the 1950s and 1960s, and in the late 1970s, the technique was further developed by the Danish Technological Institute. The results of the investigation show that the old durable concrete is a dense, strong concrete without signs of internal deterioration.
10.14359/1341
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