Effects of Curing Time and Fly Ash Content on Properties of Stabilized Dredged Material
Publication: Journal of Materials in Civil Engineering
Volume 29, Issue 10
Abstract
Properties of raw dredged material (RDM) stabilized with self-cementing Class C fly ash (FA) were evaluated for beneficial use in geotechnical construction applications. Emphasis was placed on evaluating effects of curing time and fly ash content on index and engineering properties relevant to pavement construction. RDM samples were blended with 10, 20, and 30% FA and cured for 2 h, 7 days, and 28 days. Fly ash stabilization reduced plasticity and improved the engineering properties of the stabilized dredged material (SDM). Increasing FA content increased maximum dry unit weight and reduced optimum water content for compaction. Unconfined compressive strength () increased with FA content and curing time. The effect of curing time on was more significant at higher FA content. Freeze-thaw cycles only reduced the strength of SDM specimens by 5% on average, indicating that SDM was durable to freeze-thaw. Analytical relationships were developed to predict Atterberg limits and of SDM at different fly ash contents and curing times. The California bearing ratio (CBR) for the SDM ranged from 10 to 20, which is comparable to compacted silty sand or sand and rates as fair to good for pavement subgrade. The resilient modulus () increased significantly with FA content and varied between 35 and 83 MPa, which is comparable to gravel or crushed stone and rates as good to excellent for subgrade. Results indicate that low-strength dredged materials stabilized with Class C fly ash are viable for beneficial use as pavement subgrade material.
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Acknowledgments
The authors acknowledge support from the National Center for Freight and Infrastructure Research and Education (CFIRE). The authors are also grateful to Isak Fruchtman and Sarah Fernholz for their help during the tests. The opinions, findings, conclusions, or recommendations expressed herein are those of the authors and do not necessarily represent the views of the sponsors.
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Information & Authors
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Published In
Journal of Materials in Civil Engineering
Volume 29 • Issue 10 • October 2017
Copyright
©2017 American Society of Civil Engineers.
History
Received: Aug 30, 2016
Accepted: Apr 11, 2017
Published online: Jul 26, 2017
Published in print: Oct 1, 2017
Discussion open until: Dec 26, 2017
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