Report No.	AZP17 (jot this number down to order)
Title	Viscosity Measurements of Asphalt-Rubber Binders
Author(s)	Jimenez, R.A., U of A
Publisher	Arizona Traffic & Transportation Institute
Pub. Date	July, 1989
Pages	30
Keywords
Description	Early unpublished work is presented on the measurement for viscosity of asphalt-rubber blends. The viscometers used were selected with the thought to minimize "side friction" effects on the flow of asphalt-rubber. The vixcometers were of the falling coaxial cylinder type and the forced flow Schweyer Rheometer. Most of the work done was for evaluation of the Schweyer device for determining effects on rheometer and rubber variables on measured viscosity. These variables were (a) diameter of flow-tube, (b) amount of rubber in the blend, (c) gradation of rubber particles, (d) type of rubber, and (e) test temperature. The shear stress-shear rate relationship was taken to be a power function (T = I c) and viscosity (T/) was calculated at a shear rate of 1 sec -1 and therefore equal to I the intercept at 10 on log-log coordinate axes. The data indicated that: 1. the viscosity be calculated at a shear rate of 1, 2. flow tubes of 9.70mm and 12.70mm yielded the same values of viscosity, 3. the flow tube of 2.43mm (a standard) was not considered adequate for asphalt-rubber; 4. the 25C viscosity of one type of rubber blend increased as the rubber content increased form 20 to 25 to 30%; 5. there was not a direct relationship between viscosity and range of particle size; 6. the viscosity-temperature susceptibility of one rubber blend was greater than for the other, and 7. the Schweyer Rheometer was considered a good device for comparing rheological properties of asphalt-rubber blends.
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