Influence of Recycling Agents Addition Methods on Asphalt Mixtures Properties Containing Reclaimed Asphalt Pavement (RAP)

Hassan Ziari (), Mojtaba Hajiloo and Pooyan Ayar
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Hassan Ziari: Department of Highway and Transportation Engineering, School of Civil Engineering, Iran University of Science and Technology, Narmak, Tehran 1684613114, Iran
Mojtaba Hajiloo: Department of Highway and Transportation Engineering, School of Civil Engineering, Iran University of Science and Technology, Narmak, Tehran 1684613114, Iran
Pooyan Ayar: Department of Highway and Transportation Engineering, School of Civil Engineering, Iran University of Science and Technology, Narmak, Tehran 1684613114, Iran

Sustainability, 2022, vol. 14, issue 24, 1-18

Abstract: Recycling agents (RAs) are used to restore the physicochemical properties of the aged asphalt binder existing in the reclaimed asphalt pavement (RAP) material. The best location for adding the RAs in the manufacturing process of the asphalt mixtures containing RAP has always been of concern to asphalt mixture researchers. In this study, vegetable, paraffinic and aromatic extract oils were used as RAs. The effect of RA location on the performance properties of the asphalt mixtures containing different percentages of the RAP material was investigated by adding the RAs in three different locations, including in the virgin binder, in the hot RAP material, and in the final mixture. For this aim, the rutting, cracking, and moisture sensitivity of the mixtures containing different RAs at different locations was investigated. The results showed that the best location for adding the RAs is different for various RAs. The best place for adding the paraffinic, aromatic extract, and vegetable oils in terms are in the virgin binder, in the RAP, and the final mixture, respectively. Therefore, using RAs in their appropriate location can improve the mechanical properties of asphalt mixtures containing RAP.

Keywords: recycling agents (RAs); reclaimed asphalt pavement (RAP); RA location (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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