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Roel Hendrickx, Martin Rezeau, Koenraad Van Balen, Dionys Van Gemert
Mortar and paste rheology: concentration, polydispersity and air entrapment at high solid fraction
Appl. Rheol. 19:5 (2009) 52550 (12 pages)
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Rheological characterisation of mortar is complicated by phenomena of slip, the formation of shear bands and depletion. At
relatively low solid fractions a typical Couette geometry and a medium-size mixer-type rheometer were used to determine
flow curves. At higher solid fractions a large-size coaxial cylinder rheometer with multiple blade vane geometry was used up
to the point where slippage occurred. The viscosity as a function of concentration responds to the Krieger-Dougherty law,
when a mortar is considered as a suspension of sand in a matrix of binder slurry. The limits of this description corresponds to
a critical solid fraction above which air is entrapped during the mixing procedure: air content measurements demonstrate
this phenomenon. A clear relationship between mortar and slurries was established, based on the measured properties of
both binder and sand particles, and on the Farris model for polydisperse suspensions. Intrinsic viscosity can be used as a tool
to evaluate shape characteristics of the binder particles. A procedure for mixture optimisation of mortars using this model is
demonstrated for the case of a trimodal mortar.
► Cite this publication as follows:
Hendrickx R, Rezeau M, VanBalen K, VanGemert D: Mortar and paste rheology: concentration, polydispersity and air entrapment at high solid fraction, Appl. Rheol. 19 (2009) 52550.
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