Evaluation of ettringite-related swelling mechanisms for treated chromite ore processing residue

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dc.contributor.author Wazne, Mahmoud
dc.contributor.author Moon, Deok Hyun
dc.contributor.author Dermatas, Dimitris
dc.contributor.author Sanchez, Adriana
dc.contributor.author Hoon Cheong, Kyung
dc.contributor.author Park, Jeong-Hun
dc.date.accessioned 2016-06-10T06:11:09Z
dc.date.available 2016-06-10T06:11:09Z
dc.date.copyright 2015 en_US
dc.date.issued 2016-06-10
dc.identifier.issn 0944-1344 en_US
dc.identifier.uri http://hdl.handle.net/10725/4004
dc.description.abstract Accelerated one-dimensional unconfined swell tests were conducted for ferrous sulfate chromite ore processing residue (COPR) field-treated samples. The field-treated samples were subjected to wet and dry cycles over 100 days to accelerate the lithification of the samples. Parallel laboratory experiments were performed to investigate the effects of mineralogy on COPR swell under controlled conditions. The field and laboratory samples were treated with ferrous sulfate at a ferrous-to-Cr6+ molar stoichiometric ratios of eight (8×) and five (5×). X-ray powder diffraction (XRPD) and scanning electron microscopy (SEM)-energy dispersive X-ray spectroscopy (EDX) analyses were used to investigate the mineralogical changes upon treatment. The swell results indicated that significant COPR swelling was observed in all of the tested samples. The swelling was more pronounced in the 5× treated COPR sample than in the 8× treated COPR sample. Moreover, the laboratory-treated samples showed greater swelling behavior as compared with the field-treated samples, which was most probably due to the high dry density of the COPR, indicating that dry density was a more dominant factor than lithification. XRPD and SEM-EDX results confirmed that significant ettringite formation occurred in all treated samples. en_US
dc.language.iso en en_US
dc.title Evaluation of ettringite-related swelling mechanisms for treated chromite ore processing residue en_US
dc.type Article en_US
dc.description.version Published en_US
dc.author.school SOE en_US
dc.author.idnumber 201205627 en_US
dc.author.department Civil Engineering en_US
dc.description.embargo N/A en_US
dc.relation.journal Environmental Science and Pollution Research en_US
dc.journal.volume 22 en_US
dc.journal.issue 1 en_US
dc.article.pages 738-744 en_US
dc.keywords Chromite ore processing residue en_US
dc.keywords Cr en_US
dc.keywords Ettringite en_US
dc.keywords Heaving en_US
dc.keywords Swelling en_US
dc.identifier.doi http://dx.doi.org/10.1007/s11356-014-3554-8 en_US
dc.identifier.ctation Moon, D. H., Wazne, M., Dermatas, D., Sanchez, A. M., Cheong, K. H., & Park, J. H. (2015). Evaluation of ettringite-related swelling mechanisms for treated chromite ore processing residue. Environmental Science and Pollution Research, 22(1), 738-744. en_US
dc.author.email mahmoud.wazne@lau.edu.lb en_US
dc.identifier.tou http://libraries.lau.edu.lb/research/laur/terms-of-use/articles.php en_US
dc.identifier.url http://link.springer.com/article/10.1007/s11356-014-3554-8 en_US

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