Physical, Chemical and Mineralogical Influences on the Settling Patterns of Thoroughly Disturbed Soft Marine Clay.
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Accession number;03A0178548
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| Title;Physical, Chemical and Mineralogical Influences on the Settling Patterns of Thoroughly Disturbed Soft Marine Clay. |
| Author;
KONDO F
(Miyazaki Univ., Miyazaki, Jpn)
TORRANCE J K
(Carleton Univ., On, Can)
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Journal Title;Transactions of the Japanese Society of Irrigation, Drainage and Reclamation Engineering
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Journal Code:S0345A
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ISSN:0387-2335
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VOL.;NO.223;PAGE.89-97(2003)
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| Figure&Table&Reference;FIG.12, REF.17 |
| Pub. Country;Japan |
| Language;English |
| Abstract;The settling patterns of Leda clay suspensions over wide ranges of water content(500 to 6000%) and salinity(0.5 to 30g/L NaCl) are influenced by a series of mineralogical and chemical factors. In order from least flocculating to most flocculating, the settling patterns are: dispersed free settling; flocculated free settling; zone settling; and consolidation settling. In general, higher suspension particulate concentration and higher salinity encourage sedimentation by more-strongly-flocculating patterns. Relative to the control material(a Na-saturated Leda clay, with 59%<2.MU.m material and dominated by low-activity minerals, which exhibited all the settling patterns within the water content/salinity ranges investigated), the water content/salinity boundaries between sedimentation patterns were shifted toward lower salinity and higher water content(in favour of more-strongly-flocculating patterns) by: augmentation of clay content(strong effect); addition of high-swelling smectite(strong effect); presence of ions more strongly flocculating than sodium(strength of effect not tested, but could be strong); and removal of the in-situ, <1%, organic matter by oxidation(small effect). The boundaries were shifted towards higher salinity and lower water content(in favour of less-strongly flocculating patterns) by: addition of co-sedimenting, particulate iron oxide(small effect); decrease in the clay content(strong effect); and augmentation of organic content with fulvic and humic acids extracted from peat(very strong effect). (author abst.) |
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