Aging Effects in Field-Compacted Dredged Material: Steel Slag Fines Blends
Publication: Journal of Hazardous, Toxic, and Radioactive Waste
Volume 17, Issue 2
Abstract
This paper contains the results of aging study performed on 365-day-old trial highway embankments constructed of field-compacted dredged material (DM), steel slag fines (SSF), and three DM-SSF blends. Key findings include that moisture content of the internal core at 365 days was essentially unchanged from the as-built conditions, and the bulk (major oxide) chemistry of the DM-SSF blends matched what was predicted by the field blending ratios. The addition of SSF to the 100% DM resulted in significant pH buffering and in strength increases up to a factor of 2, as measured by the average cone penetrometer test (CPT) tip resistance. Refusal ( or ) was encountered in the 100% SSF embankment at a depth of approximately 1.5 m. The 365-day aged 100% DM and DM-SSF blend had effective friction angles on the order of 34 and 52°, respectively, where the dry DM content is reported first. Quantitative X-ray diffraction analyses indicated that no new crystalline phases were observed in the DM-SSF blends, such as those commonly associated with typical cementation reactions. For 365-day-old DM-SSF blends containing between approximately (100% SSF) and (100% DM) total arsenic, the 95% upper confidence limit on the average. As concentration from the combined toxicity characteristic leaching procedure/synthetic precipitation leaching procedure (TCLP/SPLP) leaching results was less than the SPLP detection limit (), suggesting that the environmental risk associated with beneficially using the DM-SSF blends may be negligible.
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Acknowledgments
The Maryland Port Administration (Baltimore) provided the resources and the dredged material to support this research under contract 270025-S-1 “Innovative Reuse of Dredged Material” to Schnabel Engineering (West Chester, Pennsylvania), the prior affiliation for Drs. Malasavage and Grubb. Messrs. Frank Hamons and Bill Lear (MPA) are thanked for their support and involvement. The SSF media were provided by Phoenix Services, LLC (Terry Wagaman). The CPT testing, environmental analytical, and XRF testing were performed by CONETEC, Fredericktowne Laboratories, and CTL, respectively. All other experiments conducted through the W.M. Keck Geoenvironmental Laboratory at the Stevens Institute of Technology, the prior affiliation for Drs. Wazne and Jagupilla. Mehrdad M. Javaherian (Endpoint Consulting, Inc.) provided valuable insight in the data validation issues of the arsenic data shown in Table 4 and Fig. 4. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the project sponsors.
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Published In
Journal of Hazardous, Toxic, and Radioactive Waste
Volume 17 • Issue 2 • April 2013
Pages: 107 - 119
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jan 25, 2012
Accepted: Jul 26, 2012
Published online: Mar 15, 2013
Published in print: Apr 1, 2013
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