Print Email Facebook Twitter Rheological measurements on artifical muds Title Rheological measurements on artifical muds Author De Wit, P.J. Faculty Civil Engineering and Geosciences Department Hydraulic Engineering Date 1992-11-01 Abstract The rheological behaviour of three artificial muds was determined using a rotational viscometer. First some characteristics of the viscometer used were rneasured. For want of an appropriate calibration tluid, the viscosity of demineralized water was determined. The result agreed very well with what could be expected from literature. Then the rheological behaviour under simple shear tlow was determined of suspensions of three kinds of artificial muds, namely Ball, China and Westwalder clay. All of these clays are commercially available. It was found that these clays had a shear-thinning viscoplastic behaviour. The intluence of NaCI, salinity 5 promile, on the behaviour was also studied. The measurements showed that the yield stress was maximal for suspensions of Westwalder clay (suspended sediment concentrations =< 200 kgm ^-3). Ball clay showed the lowest yield stress and the yield stress of China clay was intermediate. Any intluence of the addition of NaCI was not detectable. However, the behaviour ofhighly concentrated suspensions of China clay with concentrations ranging from 300 to 600 kgm^-3 was clearly affected by the addition of salt. When salt was added, an increase in the yield and the Bingham stresses was observed. Finally, some oscillatory shear flow measurements were made in order to determine some viscoelastic properties of saline China clay suspensions. The frequency selected in the experiments was 0.66 Hz and the strain ranged from 1 to 7. The results showed a decrease in the amplitude of the complex modulus of elasticity and the phase shift for increasing strain. Subject rheologyrheological behaviourartificial mudBall clayChina clayWestwalder clayviscometermeasurementscharacteristicsshear flow To reference this document use: http://resolver.tudelft.nl/uuid:597bfb9e-4cae-4c17-af0a-b622e46c21f1 Publisher TU Delft, Department of Hydraulic Engineering Source Report no. 9-92 Part of collection Institutional Repository Document type report Rights (c) 1992 TU Delft, Department of Hydraulic Engineering Files PDF Wit_de1992a.pdf 7.4 MB Close viewer /islandora/object/uuid:597bfb9e-4cae-4c17-af0a-b622e46c21f1/datastream/OBJ/view