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KMID : 1024519960050010035
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Journal of the Environmental Sciences
1996 Volume.5 No. 1 p.35 ~ p.41
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Rheological Study on bentonite Clay Sedimentation with various concentrations of Sea water
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Choi Sang-Won
Seo Ho-Joon
Kwon Oh-Yun
Kim Nam-Jeong
Bang Jung-Hwan
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Abstract
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For studying of coagulation and sedimentation in estuarine clay, we obtained several flow curves with various concentrations of sea water by using Coutte type rotational rheometer. The initial shear stress on high concentration of sea water was observed big, but after this, its value is decreasing with increasing shear rate. The maximum pick of shear stress is decreasing with the decreasing of concentration of sea water The trend is same totally above for viscosity. The sedimentation times with the concentration of sea water vary in ~ 5 minutes. The zeta potential is changed dramatically between 114 and 118 concentration of sea water. That is consistent with the sedimentation graph. From these results, the phenomena of coagulation and sedimentation can be explained with viscoelastic terms on structual formation among particles by the changes of surface potential affected from contacting sea water to dispersed particles. Key Words : bentonite, rheology, sea water, sedimentation, viscosity, shear rate, shear stress
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KEYWORD
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bentonite, rheology, sea water, sedimentation, viscosity, shear rate, shear stress
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