Related Experiment Video
Updated: Jun 4, 2025

Advanced Self-Healing Asphalt Reinforced by Graphene Structures: An Atomistic Insight
Published on: May 31, 2022
Evaluating Impact of Thermo-Oxidative and Ultraviolet Aging on Performance of Hot In-Place Recycled Asphalt Mixtures
Yao Guan1, Yao Zhang1,2, Tianyi Sang1
1College of Civil Science and Engineering, Yangzhou University, Yangzhou 225127, China.
Abstract:
Hot in-place recycling (HIR) is a sustainable pavement rehabilitation method. However, it is susceptible to aging processes that can compromise its mechanical properties and long-term performance. This study investigates the effects of thermo-oxidative (TO) and ultraviolet (UV) aging on HIR mixtures. Basic performance tests were conducted on the aggregate gradation, moisture content, and asphalt content of the reclaimed asphalt pavement (RAP) to assess the aging level. Simulations of long-term and short-term oxidative aging of the HIR mixture, along with 12 months of UV irradiation, were performed to evaluate its high-temperature stability, low-temperature crack resistance, and water stability. The Verhulst model was employed to establish a predictive equation for performance attenuation under UV aging. To quantify the photoaging effect, indicators for UV aging degree were proposed to characterize the road performance of the HIR mixture, including the aging rate and the aging residual index. Results indicate that the improvement in high-temperature performance after aging is limited, but cracking resistance decreases substantially. Notably, the flexural tensile strain was reduced by 129.25 με for 10 years of TO aging compared to 12 months of UV exposure, underscoring the importance of considering environmental factors in performance predictions. This study emphasizes the need for enhanced aging mitigation strategies to improve the sustainability and reliability of HIR mixtures in practical applications.
More Related Videos
Related Concept Videos
Hot Weather Concreting
Mitigating the heat increase in concrete can be economically achieved by shading aggregate stockpiles to prevent heating from solar radiation,...
Design Example: Managing Concrete Workability
Cold Weather Concreting
To counteract the negative impacts of cold weather, ensuring...
Toughness and Hardness of Aggregate
Unsoundness of Aggregate due to Volume Change
Abrasion Resistance of Concrete
One such test is the revolving disc test, where three plates...

