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Poster Presentation at the Conference

Asphalt Binder and Mixture Characterization

Session: Meet the Author - Poster Session PS-2

1373566 - Poker Chip Test Method and Field Validation to Evaluate Tensile Strength and Ductility of Asphalt Binders

Thursday, June 15, 2023
3:00 PM – 4:30 PM CST
Room: Governor's Grand Ballroom
Salon ABC
TRACK: Poster Presentation
There is a need to develop methods and parameters that can evaluate the full tensile behavior of asphalt binders due to an increasing use of modifiers, additives and recycled materials. Cracking in flexible pavements is one of the most prevalent forms of distress and it may be improved by use of the appropriate asphalt binder. This study presents a simple and repeatable test method to examine the tensile strength and ductility of asphalt binders using a poker chip geometry. The poker-chip geometry has previously been used to induce a realistic stress state in asphalt binder similar to that exerted on asphalt binder confined between two aggregates. Field performance data measured on several pavement sections in Texas  was compared with poker chip test ductility of asphalt binders recovered from field cores. This study finds poker chip test to be a promising means of measuring ductility as well as characterizing the ability of asphalt binders to resist fatigue and thermal cracking. The results indicate that a ductility parameter obtained is highly repeatable. In addition, the test was able to distinguish between different levels of modification, sensitive to aging, recycled binder ratio and modifier type as well as characterizing the ability of asphalt binders to resist fatigue and thermal cracking based on field data.

Learning Objectives:

Attendees can expect to learn the following from this session:
  • Use poker-chip geometry as an accurate indicator of the cracking resistance of asphalt binders in an asphalt mixture due to a similar stress state with high confinement.
  • Conduct the poker-chip test on a routine basis to evaluate the cracking resistance of asphalt binders including binders incorporating reclaimed asphalt pavement (RAP).
  • Evaluate tensile strength and ductility measured using the poker chip test on asphalt binders.