Formulation and Validation of Highly Elastic Asphalt Binders

Status: Completed

Funding Agency: Department of Defense

Abstract:

This study focuses on formulating highly elastic asphalt binders capable of withstanding the extreme conditions of arctic and subarctic environments. Laboratory testing evaluated binder elasticity and mixture performance, with the goal of producing crack-resistant asphalt mixtures suitable for cold regions. Various modifiers were investigated to enhance low-temperature elasticity, with optimization guided by rheological and morphological binder tests, including Time–Temperature Sweep, Linear Amplitude Sweep, and Single Edge-Notched Beam. Mixture-level evaluation included Dynamic Complex Modulus, Semi-Circular Bend, Thermal Stress Restrained Specimen, and Bending Beam Fatigue testing to characterize cracking resistance. Field validation of the ability of these binders to resist thermal cracking is underway through four test strips constructed in Fairbanks, Alaska—three incorporating highly elastic binders and one serving as a control. The outcomes will establish performance-based criteria and specifications for highly elastic binders, generating design inputs and practical guidance for cold-region pavement applications with proven field performance.

Principal Investigators: Dr. Yusuf Mehta, PhD., Dr. Ayman Ali, PhD., Dr. Arunkumar Goli, PhD.

Links to Publications: 

• “Field Evaluation of Low-Temperature Cracking Performance of Highly Elastic Asphalt Mixtures Under Extreme Cold Conditions in Alaska” – Transportation Research Record (https://doi.org/10.1177/03611981261445076)
• “Impact of Softening Agents on the Rheological Performance of Highly Elastic Asphalt Binders” – Journal of Materials in Civil Engineering (https://doi.org/10.1061/JMCEE7.MTENG-21802)
• “Influence of Softening Agents on Low and Intermediate Temperature Cracking Properties of Highly Polymer Modified Asphalt Binders” – Construction and Building Materials (https://doi.org/10.1016/j.conbuildmat.2025.142404)