CEN/TS 15325:2008

This European standard describes the determination of Zero Shear Viscosity (ZSV), ηo, for bitumens and bituminous binders, preferably using test temperature domains in which 100 Pa.s < ηo < 50 000 Pa.s. The preferred test temperature is 60 °C but other temperatures for example, 45 °C or 50 °C could be used. Under these conditions, ZSV (also referred to as the first Newtonian viscosity or absolute viscosity) is a suitable indicator to evaluate the partial contribution of the bituminous binder (including Polymer Modified Binders) to the rutting resistance of asphalt pavement layers. This European standard describes the determination of ZSV using a Shear Stress Rheometer (SSR) in creep mode. This method is applicable to unaged, aged and recovered bituminous binders including Polymer Modified Binders (PMBs).