Investigating the performance of asphalt mixtures containing recycled highway chips and rejuvenating materials against moisture deterioration

Articles in Press

Document Type : Original Article

Authors

• Hamidreza Eftekhari ¹
• parham hayati ²
• ali mpniri ³

¹ Department of Civil Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran

² Department of Civil and Environmental Engineering, Tarbiat Modares University, Tehran, Iran

³ Department of Civil and Environmental Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran

10.22067/jfcei.2025.91390.1334

Abstract

In this study, the effect of four types of recycled asphalt chips for highways including Mazandaran M-B, Golestan G-G, Tehran Hemmat T-H, Tehran Babaei T-B, and their usage percentages and three types of oil rejuvenators including sunflower oil R1, cyclogen R2, and vacuum batum R3 on the moisture deterioration characteristics of asphalt mixtures has been investigated and evaluated. The bitumen used in this study is PG 64-16. In order to determine the moisture deterioration occurrence parameters, surface water energy tests on bitumen and boiling water tests (along with image processing to analyze the extent of deterioration) and PULL OFF were performed on mixtures containing recycled asphalt chips. The results showed that changes in the composition of chips and the addition of rejuvenators have a significant effect on the resistance of mixtures to moisture deterioration. Also, asphalt mixtures containing limestone have higher adhesion and cohesion values with the base bitumen in both dry and wet conditions. However, with the addition of rejuvenator, the adhesion and cohesion strength in the dry state of limestone decreases and increases in the wet state. The results of the PULL OFF test indicate the importance of rejuvenators in improving the adhesion of aggregates and the cohesion of mixtures to the road surface. Also, the results of measuring the surface free energy components of the bitumens used in this study showed that the bitumen modified with rejuvenator has a higher total surface free energy compared to the base bitumen.

Keywords

• Recycled asphalt mixture
• Chip percentage
• Moisture damage
• Rejuvenating materials

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