Comparison of the Properties of Laboratory and Field-Prepared CRM Binders

Authors: Junan Shen, Serji Amirkhanian



Crumb Rubber Modified binders (CRM binders) have been used for pavement mixtures because of their better performance properties over base asphalt binders. The performance properties of CRM binders are influenced by various factors including the types of both the base binders and the CRM, and the mixing conditions used for producing the CRM binders. In this study, the properties of CRM binders produced in two different conditions,
namely in the laboratory and in the field, were compared. These properties included viscosity and the performance properties specified by SHRP binder specifications. Two lab produced binders and two field produced binders were tested and compared, respectively. The CRM binders were tested in three states: no aging, Rolling Thin Film Oven (RTFO) aging resides, RTFO+Pressurized Aging Vessel (PAV) aging resides as well. The results of this study
indicated that: 1) there is no big significant difference between the viscosities of the CRM binders produced in the two different conditions; 2) the high temperature grades of CRM binders produced in laboratory were one PG grade higher than those produced in the field; 3) the difference of low temperature grades for between the binders produced in laboratory and in field was less than one PG grade.

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