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Five samples of polymer modified asphalt were tested for viscosity at 60°C (140°F) using ASTM Test Method D2171 (Viscosity of Asphalts by Vacuum Capillary Viscometer). The samples were obtained from four different suppliers, and the polymers used included SB (styrene-butadiene), SBR (styrene-butadiene rubber latex), SBS (styrene-butadiene-styrene block copolymer), Neoprene and EVA (ethylene-vinyl acetate copolymer). Ten labs participated in the study. Each lab was asked to measure the viscosity of each sample using straight walled viscometers (either Asphalt Institute or modified Koppers type) and using Cannon-Manning viscometers. Analysis of the results shows that straight walled viscometers should be used for determining the viscosity of polymer modified asphalts. Four of the five samples were found to have Newtonian behavior at this temperature.
polymer modified asphalt, rheology, viscosity
Research Engineer, Conoco Inc., Ponca City, OK