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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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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.
Title: Diagnosis and Prognosis of Alkali-Aggregate Reactivity in Concrete Structures
Author(s): V. Corinaldesi and G. Moriconi
Publication: Special Publication
Appears on pages(s): 289-298
Keywords: AAR diagnosis; AAR prognosis; accelerated laboratroy test; alkali-aggregate reactivity
Abstract:Management of concrete structures affected by alkali-aggregate reactivity is quite complex, particularly in relation to prognosis more than that of diagnosis of the damaged structures. Until now a valid method to determine the potential for further deterioration is not available. Fifteen concrete structures showing typical signs of alkali-aggregate reactivity (AAR) were studied. Cores were taken from the structures and subjected to mechanical investigations and scanning electron microscopy observations in order to identify the cause of concrete deterioration. The observation on only one of these fifteen structures is reported on in this paper as an example of the adopted methodology. Once AAR was diagnosed, part of these cores were used to carry out laboratory tests performed for prognosis purposes. The cores were immerged in 1N sodium hydroxide solution at 40°C and their change in weight and dynamic elastic modulus was monitored up to six months of exposure in order to determine the potential for further reaction. Data related to dynamic modulus fluctuations in time were suitably worked out for each element of the monitored structure. Taking into account both the degree of structural integrity at the time of coring, evaluated through mechanical characterization, and the potential for future deterioration, valuable by means of the dynamic modulus fluctuation under an accelerated laboratory test, a ranking of concrete structures could be suggested in terms of priority of intervention for restoration.
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