Effect of Fly Ashes on the Rheological Properties of Fresh Cement Mortars

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Rheological measurements of a concentrated suspension can be used to describe the flow of concrete. The rheological constants (yield value and plastic viscosity) of the mortar can be determined with a co-axial viscosimeter, and this technique is applied in this study. If the efficiencies of the mortar phase with respect to the cohesion, fluidity, bleeding and the friction of the concrete with the pipe are taken into consideration, this approach can be recognized as beneficial and helpful. Rheological tests on mortars were carried out with a Mettler RM 180 Rheomat co-axial viscosimeter. The angular deformation rate ( \(\dot {\gamma}\)) and shearing stresses (τ) were determined, and \(\dot {\gamma}-\tau \) diagrams were drawn. All the mortars showed a tixotropic behavior conforming to the Bingham model. A linear regression of these parameters gave the yield value (τ o) and the plastic viscosity (ηpl) of the mortars.

Keywords

Bingham model co-axial viscosimeter fly ash plastic viscosity pumping concrete superplasticizer workability yield value 
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Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  1. 1.Faculty of Architectural & Engineering, Civil Engineering DepartmentSüleyman Demirel UniversityIspartaTurkey

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