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Independent MnDOT Study Highlights Long-Term Performance of Asphalt Rejuvenators

A recently completed independent study commissioned by the Minnesota Department of Transportation (MnDOT) provides valuable insight into how spray-applied asphalt rejuvenators perform under real-world conditions over time. Conducted in partnership with Michigan State University at the MnROAD research facility and a local roadway in St. Michael, Minnesota, the 36-month evaluation examined the long-term effectiveness of 12 commercially available rejuvenators across multiple pavement conditions and environmental cycles.

The results underscore the importance of preservation timing. Agencies that apply rejuvenation treatments while pavements are still in fair-to-good condition can often preserve pavement flexibility and slow oxidation before more significant structural deterioration occurs. This proactive approach supports broader asset management goals by extending pavement life, improving network condition, and maximizing available maintenance funding.

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