Geoenvironmental Evaluation of RCA-Stabilized Dredged Marine Sediments as Embankment Material
Publication: Journal of Materials in Civil Engineering
Volume 33, Issue 1
Abstract
Millions of cubic meters of marine sediment are dredged from Chesapeake Bay waters in Maryland each year. Due to their low-strength characteristics, the sediments often need to be amended with other geomaterials for potential use in earthworks projects. However, the environmental effects of the blend need to be thoroughly investigated prior to such use. In an effort to alleviate storage challenges for these dredged sediments, the current study investigates their potential use in highway embankments upon amending them with recycled concrete aggregate (RCA). The laboratory compaction test data indicate that RCA amendment causes an increase in gravel content, decreases the liquid limit, and increases the unit weight of the virgin sediments, resulting in a typical material for embankment construction and satisfying the minimum unit weight requirements set by the local highway authority. tests and sequential column leaching tests were carried out to evaluate variations in leachate concentrations across pH and time. The RCA addition causes a slight increase in leached metal concentrations; however, all metals except copper remain below water quality limits. The numerical simulations showed that, while contaminant concentrations in leachate from the sequential column leaching tests at times exceed the water quality limits, those concentrations are dissipated and diluted rapidly in situ both in surface waters and in groundwater, and thus are not likely to be of concern.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
Funding for the study was provided by the Maryland Port Administration (MPA) and the University of Maryland ASPIRE program. The second author was funded by the Turkish Scientific and Technological Research Council (TUBITAK) during her stay at the University of Maryland. The conclusions and recommendations listed in this article are those of the authors and do not reflect the opinions or policies of any of the organizations acknowledged.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 1 • January 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Oct 16, 2019
Accepted: Jul 13, 2020
Published online: Oct 30, 2020
Published in print: Jan 1, 2021
Discussion open until: Mar 30, 2021
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