Artificial Intelligence Policy: ASTM International prohibits the entry of ASTM standards and related ASTM intellectual property (“ASTM IP”) into any form of Artificial Intelligence (AI) tools, such as ChatGPT. Additionally, creating ----derivatives of ASTM IP using AI is also prohibited without express written permission from ASTM’s President. In the case of such use, ASTM will suspend a licensee’s access to ASTM IP, and further legal action will be considered.
New Practice for Determining the Impact of an Asphalt Additive on Unaged Asphalt Binder Rheology using Dynamic Shear Rheometer
1. Scope
This practice covers test methods and equations for calculating percent change between two laboratory blended asphalt binder samples, typically a neat asphalt binder and an asphalt binder blended with an additive material. The percent change can be used to identify a dosage level of additive which yields an Agency accepted asphalt binder G*/sin delta property range. This calculation is based on G*/sin delta values using laboratory blended unaged asphalt binder. The intent of the standard practice is to conduct a relatively quick evaluation of the percent change between pre-blended and post-blended asphalt binder samples.
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).
