Road testing: Research team studies potholes in quest for better asphalt sustainability

A Missouri S&T research team is investigating asphalt binders to enhance understanding of their performance and improve the longevity of Missouri's roads. These binders are susceptible to degradation due to exposure to sunlight, varying weather conditions, and the constant strain from traffic. Dr. Klaus Woelk, a professor of chemistry, emphasizes the importance of testing road materials to prevent issues like potholes.

The team employs relaxometry analysis and nuclear magnetic resonance (NMR) excitation to study the asphalt microstructure before and after use, aiming to optimize asphalt treatments for more efficient and cost-effective road repairs. Asphalt is a refined byproduct of crude oil, mixed with aggregates, and exposed to environmental factors like UV light, oxygen, and freeze-thaw cycles, which alter its molecular structure, making it brittle and prone to cracking.

Dr. Rebecca Herndon, a research collaborator, notes that the research aims to establish clear standards for asphalt rejuvenation, particularly in the absence of a definitive definition currently. The findings will be shared with the Missouri Department of Transportation (MoDOT) to aid in developing standardized testing procedures for asphalt rejuvenation materials.

The team comprises Dr. Woelk, Dr. Herndon, and undergraduate students Rosalee Brown and Catherine Skaggs, with the latter conducting fieldwork to gather asphalt samples from diverse geographical locations, recognizing the significant impact of local climate on road conditions.