Abstract
ABSTRACT This study presents an empirical model for estimating asphalt viscosity as a function of crumb rubber concentration, temperature, rubber viscosity coefficient, and virgin binder properties. Asphalt binders, modified and virgin alike are highly temperature sensitive materials, and to date not many research projects have been conducted establishing a relationship between rubber content and binder property changes due to temperature change. For this study relationships were established from a number of studies, where data was obtained from 28 binder types using 5 binder grades and 11 sources. The rubber coefficient was found to be of particular importance and was seen to be dependent on the nature of the rubber as well as the grinding procedure used to render it to crumb rubber. Rubber viscosity coefficient values are presented for each asphalt crumb-rubber combination. While all Crumb Rubber Modified (CRM) binder blends are unique, this study shows that they all exhibit similar trends when crumb rubber concentration, virgin properties, and temperature are varied.
Published Version
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