Influence of different aged RAPs on the long-term performance of emulsified asphalt cold recycled mixture
Document Type
Article
Publication Date
1-10-2025
Department
Department of Civil, Environmental, and Geospatial Engineering
Abstract
Emulsified asphalt cold recycled mixture (CRM) has attracted more and more scholars’ attention due to its advantages of construction at ambient temperature and high-usage of reclaimed asphalt pavement (RAP). However, research on the role of the aged asphalt binder on the surface of RAP in CRM during long-term pavement service is insufficient. Hence, this work studied the influence of different aged RAPs on the long-term performance of CRM. Firstly, different aged RAPs (RAP-6, RAP-12 and RAP-18) were prepared artificially. Then, the CRMs with different aged RAPs were obtained and treated through a long-term performance simulation test. Finally, the blending condition of new-aged asphalt binder on the surface of RAP and the basic road performance of CRM during long-term curing were analyzed. The results indicate that, compared with the cold mix asphalt mixture without aged asphalt binder, the aged asphalt binder plays a favorable role in enhancing the indirect tensile strength (ITS), low temperature anti-cracking resistance and water stability of CRM, whereas it has a negative influence on the high temperature stability of CRM. Meanwhile, this favorable role of the aged asphalt binder to low temperature anti-cracking resistance becomes quite weak for the CRM containing RAP-18. Moreover, for different CRMs after the long-term performance simulation test, the blending degree of the new-aged asphalt binder is enhanced gradually, as well as the more severe the aging of the aged asphalt binder is, the more the high temperature stability and water stability of the corresponding CRM is. Interestingly, the CRM with RAP-12 shows better ITS and low temperature performance than the CRM with RAP-6 or RAP-18 in the long-term curing process.
Publication Title
Construction and Building Materials
Recommended Citation
Zhu, C.,
Zhang, H.,
Li, Q.,
Wang, Z.,
&
Jin, D.
(2025).
Influence of different aged RAPs on the long-term performance of emulsified asphalt cold recycled mixture.
Construction and Building Materials,
458.
http://doi.org/10.1016/j.conbuildmat.2024.139680
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p2/1381