This practice covers test methods and equations for calculating percent mean difference between two asphalt binder samples, typically a neat asphalt binder and an asphalt binder blended with the intended material. The level of percent mean difference can be used to identify an acceptable maximum dosage of additive to maintain consistent asphalt binder G*/sin delta property. This calculation is based on G*/sin delta values using unaged asphalt binder.
Additives, Modifiers, Asphalt Binder, Dynamic Shear Rheometer, DSR
Identifying the change in an asphalt binder’s physical property, G*/sin delta, kPa, resulting from an asphalt additive may be useful to determine additive dosage range and when additional testing is needed for compliance. Additives, at the intended quantity, that alter an asphalt binder’s physical properties outside an acceptable range may negatively impact mix performance. This method was developed using a Dynamic Shear Rheometer (DSR).
The title and scope are in draft form and are under development within this ASTM Committee.
Developed by Subcommittee: D04.44
Staff Manager: Ashley Wiand
Date Initiated: 06-29-2022
Technical Contact: Richard Steger
Ballot: D04.44 (22-04)
Status: Negative Votes Need Resolution