期刊
APPLIED CLAY SCIENCE
卷 99, 期 -, 页码 306-311出版社
ELSEVIER
DOI: 10.1016/j.clay.2014.07.016
关键词
Bentonite clays; Polymer; Structural parameter; Thixotropy; Viscoelastic
In this paper, the influence of polyethylene oxide (PEO) and shear rate on rheological properties of bentonite suspensions is studied. The model of Herschel-Bulkley which is used to fit the flow curves of the mixture which based on the bentonite-polyethylene oxide and the Generalized Kelvin-Voigt model has been successfully applied to fit the creep and recovery data and to analyze the viscoelastic properties of mixture. The addition of polyethylene oxide (PEO) in a concentration range between 0 and 2% in 4% of bentonite induces not only an increase of the yield stress and the consistency index of bentonite but also a decrease of the flow index of bentonite. It is also the addition of PEO between 0 and 2% to 4% that may cause an increase in the viscoelastic properties of bentonite. For constant shear rate applied on the 4% bentonite at the 20 degrees C in which a thixotropic behavior was observed and analyzed by using a modified model of Herschel-Bulkley a structural parameter lambda is included in order to account for time dependent effect. (C) 2014 Elsevier B.V. All rights reserved.
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