Work Item
ASTM WK82536
New Practice for Determining Asphalt Modification by Dynamic Shear Rheometer
1. Scope
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.
Keywords
Additives, Modifiers, Asphalt Binder, Dynamic Shear Rheometer, DSR
Rationale
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.
Work Item Status
Date Initiated: 06-29-2022
Technical Contact: Richard Steger
Item: 001
Ballot: D04.44 (22-04)
Status: Negative Votes Need Resolution