This webinar is based upon Asphalt Institute IS-240 State-of-the-Knowledge: Use of the Delta Tc Parameter to Characterize Asphalt Binder Behavior. Delta Tc (ΔTc) is a derived asphalt binder property that has been gaining attention for the last decade. It has become a topic of focus to both researchers in the asphalt binder technical community and user agencies seeking physical property parameters that will improve hot mix asphalt pavement performance. It is generally accepted that ΔTc targets cracking behavior that is affected by asphalt binder durability related to aging of the binder in an asphalt mixture. More specifically, ΔTc provides insight into the relaxation properties of a binder that can contribute to non-load related cracking or other age-related embrittlement distresses in an asphalt pavement.
Topics to be discussed include:
- Introduction and Purpose
- Origins of ΔTc as a Parameter
- The Mechanics of ΔTc (Calculation of ΔTc; What the ΔTc Number Means; What ΔTc Looks Like)
- What Affects ΔTc (Aging; RAP and RAS; REOB/VTAE; Elastomeric Polymer)
- Considerations When Using ΔTc (Distress Types; Recovered Binder; Precision; Practical Matters)
- Full-Scale Test Projects and ΔTc
- Perceived Utility of ΔTc (Agency Specifications; Considerations for Implementation; Alternatives to ΔTc for Addressing Block Cracking)
- Recent National Research Projects and ΔTc
