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dc.contributor.authorZhang, Wan-lu
dc.contributor.authorZhao, Lun-yang
dc.contributor.authorMcCabe, Bryan A.
dc.contributor.authorChen, Yong-hui
dc.contributor.authorMorrison, Liam
dc.date.accessioned2020-04-22T09:23:17Z
dc.date.issued2020-04-08
dc.identifier.citationZhang, Wan-lu, Zhao, Lun-yang, McCabe, Bryan A., Chen, Yong-hui, & Morrison, Liam. (2020). Dredged marine sediments stabilized/solidified with cement and GGBS: Factors affecting mechanical behaviour and leachability. Science of The Total Environment, doi:https://doi.org/10.1016/j.scitotenv.2020.138551en_IE
dc.identifier.issn1879-1026
dc.identifier.urihttp://hdl.handle.net/10379/15900
dc.description.abstractManagement strategies for the safe disposal of contaminated dredged marine sediment are a global scale environmental issue. Stabilization/solidification method was investigated as a sustainable approach for the potential recycling of the sediment as a construction material. A systematic study of the factors affecting the mechanical performance and contaminant release was performed. The physicochemical variables selected to assess the potential re-use of the sediment treated with Ordinary Portland cement (OPC) and Ground Granulated Blast Furnace Slag (GGBS) in an aquatic environment were: curing duration (7, 28, 56 and 98 days), curing temperature (5, 20 and 40 °C) and ambient (leachate) pH (1, 4, 7 and 10). Unconfined compressive strength (UCS) tests were conducted and extended-duration tank leaching tests were used to characterize the long-term leaching of Al, Cr, Mn, Fe, Ni, Cu, Zn, As, Cd, Ba, Pb. The results showed that S/S methods provide excellent immobilization of metals in marine sediment at a pH range of 4 to 10. Immobilization efficiencies of >99.9% for Mn, Fe, Zn, As, Ba, Pb and >97.8% for Al, Cu and Zn are reported over 100 days. GGBS replacement is an effective way to further improve sediment properties by enhancing strength, mitigating sediment alkalization and offering a better immobilization capacity for Fe, Ni and Zn. The release of metals (Al, Mn, Cu, As, Ba and Pb) was strongly associated with a coupling effect of the physicochemical factors, with metal-specific responses to curing temperature, curing duration and pH. Mn mobility showed a dramatic sensitivity to ambient pH while Ba was less pH-dependent. Al release is related to strength and leached out by dissolution in any cases. Considering that dredged marine sediments may contain multiple metal contaminants which exhibit individual responses to remediation, treatment with GGBS can be considered a potentially suitable management option.en_IE
dc.description.sponsorshipThe authors acknowledge the support of the Irish Environmental Protection Agency (EPA) Small Scale Study fund (2017-W-SS-28), the National Key Research and Development Program of China (2017YFC0505404), Key-Area Research and Development Program of Guangdong Province (2019b110205003) and GDAS’ Project of Science and Technology Development (2019GDASYL-0401003). Thanks also to Ana Mendes, Nessa Golden and Owen Doherty for assistance with the chemical analysis.en_IE
dc.formatapplication/pdfen_IE
dc.language.isoenen_IE
dc.publisherElsevieren_IE
dc.relation.ispartofScience Of The Total Environmenten
dc.subjectMarine dredged sedimenten_IE
dc.subjectUnconfined compressive strengthen_IE
dc.subjectTank leaching testen_IE
dc.subjectLeaching ratioen_IE
dc.titleDredged marine sediments stabilized/solidified with cement and GGBS: Factors affecting mechanical behaviour and leachabilityen_IE
dc.typeArticleen_IE
dc.date.updated2020-04-21T08:22:21Z
dc.identifier.doi10.1016/j.scitotenv.2020.138551
dc.local.publishedsourcehttps://doi.org/10.1016/j.scitotenv.2020.138551en_IE
dc.description.peer-reviewedpeer-reviewed
dc.contributor.funderEnvironmental Protection Agency (EPA), Irelanden_IE
dc.contributor.funderNational Key Research and Development Program of Chinaen_IE
dc.contributor.funderKey-Area Research and Development Program of Guangdong Provinceen_IE
dc.contributor.funderGDAS’ Project of Science and Technology Developmenten_IE
dc.internal.rssid20707046
dc.local.contactBryan Mccabe, Dept. Of Civil Engineering, Coll Engineering & Informatics, Room Eng-1040, Nui Galway. 2021 Email: bryan.mccabe@nuigalway.ie
dc.local.copyrightcheckedYes, eligible for Open Access under IReL consortium agreement with Elsevier (email from BMC 22/04/2020)
dc.local.versionACCEPTED
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