To improve the sustainability quotient of pavement materials, recycled asphalt products are utilized. However, asphalt recycling includes the use of oxidized asphalt binder. Aged binder is highly brittle and causes cracking related distresses in flexible pavements. To improve the rheological properties of AC mixes with recycled materials, rejuvenators are used. The current study focuses on evaluating the performance of asphalt mixes prepared by blending three different kinds of rejuvenators in already aged asphalt at different percentages by weight of the total binder. The mixed asphalt samples were then aged for 5, 10, 15, 20, 40, and 60 hours in the PAV. Chemical tests such as FTIR and TLC-FID were conducted and frequency sweep tests were carried out to characterize binder rheology and calculate various damage parameters. A strong correlation was found between the rejuvenator types used in different amounts and the level of aging in asphalt. Rejuvenators restored the rheological properties of aged asphalt, but the impact at different temperatures depended on the rejuvenator type used. Damage parameters were found to increase with aging and correlated well with the chemical properties.

Contributors: Dhasmana H, Hossain K, Karakas A, Swarna S T.

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