Swelling related to ettringite crystal formation in chromite ore processing residue

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dc.contributor.author Moon, Deok Hyun
dc.contributor.author Dermatas, Dimitris
dc.contributor.author Wazne, Mahmoud
dc.contributor.author Sanchez, Adriana M.
dc.contributor.author Chrysochoou, Maria
dc.contributor.author Grubb, Dennis G.
dc.date.accessioned 2016-03-02T07:10:17Z
dc.date.available 2016-03-02T07:10:17Z
dc.date.copyright 2007
dc.date.issued 2016-03-02
dc.identifier.issn 0269-4042 en_US
dc.identifier.uri http://hdl.handle.net/10725/3232
dc.description.abstract Several million tons of Chromite Ore Processing Residue (COPR) were deposited at two sites in New Jersey and Maryland, USA, and over time they exhibited extensive heaving phenomena. Ettringite, a needle-shaped mineral and an expansive mineral commonly recognized in the literature concerning cement- and soil, has been identified extensively in numerous COPR samples collected from these sites. It was therefore believed that ettringite formation and its crystal growth are strongly associated with COPR heaving. We investigated the correlation between ettringite and the heaving phenomena in COPR materials that contained no initial ettringite. Two identical COPR samples were exposed to a 4% w/w sulfate solution (25°C, 50°C) in a confined swell test apparatus. Both swell test samples were analyzed by means of X-ray powder diffraction. The peak intensities of newly formed ettringite were more pronounced in the sample tested at 50°C, and swell development was only observed in this sample. Scanning electron microscopy analyses revealed well-crystallized ettringite needles exceeding 40 μm in length for this sample, while ettringite crystals less than 15 μm in length formed in the sample tested at 25°C. Therefore, the results suggest that the quantity of ettringite and the extent of crystallization play a key role in the heave of COPR. en_US
dc.language.iso en en_US
dc.title Swelling related to ettringite crystal formation in 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.woa N/A en_US
dc.author.department Civil Engineering en_US
dc.description.embargo N/A en_US
dc.relation.journal Environmental Geochemistry and Health en_US
dc.journal.volume 29 en_US
dc.journal.issue 4 en_US
dc.article.pages 289-294 en_US
dc.keywords Confined swell tests en_US
dc.keywords COPR en_US
dc.keywords Ettringite en_US
dc.keywords SEM en_US
dc.keywords Temperature en_US
dc.keywords XRPD en_US
dc.identifier.doi http://dx.doi.org/10.1007/s10653-007-9097-x en_US
dc.identifier.ctation Moon, D. H., Dermatas, D., Wazne, M., Sanchez, A. M., Chrysochoou, M., & Grubb, D. G. (2007). Swelling related to ettringite crystal formation in chromite ore processing residue. Environmental geochemistry and health, 29(4), 289-294. en_US
dc.author.email mahmoud.wazne@lau.edu.lb
dc.identifier.url http://link.springer.com/article/10.1007/s10653-007-9097-x

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