אסיף מאגר המחקר החקלאי

Adsorbed sodium fraction's effect on rheology of montmorillonite- kaolinite suspensions

Year:

1991

Source of publication :

Authors :

Volume :

55

Co-Authors:

Keren, R., Inst. of Soils & Water, Agricultural Research Organization (ARIO), The Volcani Center, Bet Dagan, Israel.

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Abstract:

This study was conducted to determine whether the absorbed cation composition (Na-Ca) and pH affect the rheological behavior of mixed kaolinite-montmorillonite suspensions. The suspensions of kaolinite showed a Newtonian rheology regardless of the abdsorbed ion and pH, indicating that neither structural breakdown nor orientation occurs during the flow, and non-Newtonian rheology was observed when Na-Ca montmorillonite was introduced at pH 4 or 7. At these two pHs, the deviation from Newtonian flow increased with the exchangeable sodium percentage (ESP) and it was greater at pH 4 than at pH 7. For the clay suspensions at pH 10, however, the deviation from Newtonian flow was much smaller for all ESP levels. The increase in the extrapolated shear-stress values with increasing ESP suggests that the number of linkages between montmorillonite and kaolinite particles increases with the sodicity level, since the number of montmorillonite particles per unit weight of clay in suspension increases with the ESP. -from Author

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