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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: Predicting the Microstructural Degradation of Concrete in Marine Environment
Author(s): J. Marchand, E. Samson, D. Burke, P. Tourney, N. Thaulow, and S. Sahu
Publication: Special Publication
Appears on pages(s): 1127-1154
Keywords: chloride transport; field concrete; marine environment; numerical modeling; sulfate transport
Abstract:As part of a U.S. Navy program for the Modular Hybrid Pier to predict long-term behavior of lightweight concrete in marine environments, the condition of a series of concrete samples taken from a floating boat dock exposed to the Pacific Ocean since 1978 were assessed. Samples originating form the top deck, tidal and submerged zones were tested. Microstructural alterations were investigated by petrographic examinations using optical and scanning electron microscopy. Chloride profiles were measured by chemical analyses. The hulk properties of each series of concrete samples were also determined by porosity measurements, pore solution extraction, chloride migration tests and moisture transmission measurements. The actual state of deterioration of each series of samples was compared to the results yielded by a numerical model. This numer- ical model accounts for the coupled transport of moisture and eight different ionic species (such as chloride and sulfate ions) within unsaturated concrete structures. The software also takes into consideration the chemical equilibrium of ten different solid phases (e.g. ettringite, gypsum and Friedel's salts). Parameters affecting the long-term performance of concrete in seawater are discussed.
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