DETERMINATION OF RHEOLOGICAL PARAMETERS OF LIME PASTES WITH CONSIDERATION OF THE WALL-SLIP EFFECT
 
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Uniwersytet Przyrodniczy we Wrocławiu
Publication date: 2016-09-30
 
Acta Sci. Pol. Formatio Circumiectus 2016;15(3):195–208
 
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ABSTRACT
The rheological measurements of the lime pastes were performed with use of the coaxial rotational viscometer Haake Viscotester Vt550, with different sensor systems. Obtained pseudo-curves of flow τ(γp) indicated a non-Newtonian behavior of lime pastes, which required the correction to the actual flow curves τ (γ). The corrected flow curves, for the same water-to-lime ratios W/L, but measured with different sensor systems do not coincide with each other, throughout the range of concentrations tested. This indicates the occurrence of the wall-slip effect. Therefore correction of flow curves was performed, according to Kiljański method [1989], to obtain a one flow curve for two different sensor systems. The approximation of flow curves was carried out with use of the tri-parametric Herschel–Bulkley model. An evaluation of the error in the determination of rheological parameters without taking into account the wall-slip effect was performed.
ISSN:1644-0765