Abstract
Polymer-bitumens constitute non-Newtonian pseudoplastic systems showing two Newtonian regions. To analyze the relationship of polymer-bitumen binder properties and the behaviour of a road pavement under traffic load, the absolute viscosity of the binder may be applied,i.e. viscosity under zero-shear stress conditions. This paper presents a new equation to compute absolute visocisity from measurements conducted with a rotational viscometer. The equation is a simplified form of a four-parameter CROSS equation. The meaning of the equation's parameters is also discussed. The analysis shows a great variety of characteristics in the polymer-bitumens tested. Precision of analysis and computation of parameters depend on the measuring conditions. To improve precision, the measureing device should allow measuring viscosity as close to zero-shear conditions as possible.
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