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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 12 Abstracts search results
September 1, 1987
B. Erlin and W. Hime
Based on a studu of manu structures that have suff eredfrrom damage due to chloride-in duc ed corrosion of reinforced steel, it appears that even the more stringent limits on chloride now being proposed may be too lenient. Further, only determinations of total chloride may provide a basis for rea-sonable assurance against future corrosion.
Richard D. GaynorI
During the past few years, there has been a dramatic change in the atti-tude of specifiers and concrete technologists toward the use of calcium chloride in concrete. Traditionally, admixtures containing chlorides have been banned from use in prestressed concrete, and increasingly it has been recognized that they should not be used in concrete over galvanized metal decks. In 1977, ACI Committee 201 in the Guide to Durable Concrete rec-ommended the limits shown in Table 1 for the water-soluble chloride ion con-tent of concrete, expressed as a percentage of weight of the cement. In 1983, the ACI Building Code 318-83 adopted the similar, but somewhat more liberal, limits in Table 2.
William G. Hime and Bernard Erlin
The wide variety of disciplines involved with the corrosion of steel in concrete has caused difficulties in communication. Each discipline has its own terminology; at times two disciplines use conflicting terms or explanations for the same phenomenon. This paper addresses some areas of such confusion, and presents chemical mechanisms to explain half-cell potentials and causes for chloride-induced corrosion. Examples of such corrosion are presented.
Jere H. Rose
The availability of separately ground granulated iron blast-furnace (GGBF) slag, as a separate cementitious material or supplement, has prompted new research on its effects on concrete properties. One area in which GGBF slag has particular promise in concrete is its ability to alter the permeability characteristics of concrete to the extent that its resistance to chloride intrusion is significantly improved. This paper discusses the ability of GGBF slag-cement mixtures to reduce the potential detrimental effects of chloride intrusion into concrete. Three test methods for chloride penetration were used and the results of each are discussed. The following conclusions were developed. 1. Significant reductions in permeability are achieved as the replacement level of the slag increases from 40 to 65% of total cementitious material by mass. 2. The permeability of concrete containing GGBF slag is less affected by increases in water-cement ratio than concrete containing regular portland cement alone. 3. The detrimental effects of accelerated curing on the permeability of concrete are virtually eliminated with cement blends containing GGBF slag greater than 50%. 4. Concrete containing GGBF slag may require less depth of cover to protect the reinforcing steel than those concretes using portland cement alone.
Editor: Frances W. Gibson
As a designer you need the wealth of information presented in "Corrosion, Concrete and Chlorides -- Steel Corrosion in Concrete: Causes and Restraints," a compilation of 11 papers covering the corrosion phenomenon. Prompted by the nationwide corrosion problem with concrete, there have been extensive field and laboratory investigations into the specific phenomena that induce corrosion, methods for identifying the magnitude and extent of corrosion in structures, techniques for stabilizing corrosion once it has begun, and design of structures and concretes so that corrosion will not occur. Presenting an in-depth analysis into a variety of aspects dealing with corrosion, this state-of-the-art publication includes such topics as: the marked influence of chloride in causing corrosion, ways for controlling corrosion by using chloride-free accelerators, the reduction of chloride penetration through the use of pozzolanic blast-furnace slag as an admixture in concrete, and the conductive coating aspects of cathodic protection. "Corrosion, Concrete and Chlorides" provides important answers to a complex problem.
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