Abstract
The mix design for hot in-place recycled mixtures is the key that determines the regeneration performance of asphalt pavement. However, existing design methods have numerous problems, such as the involvement of numerous influential factors and levels and poor adaptation to the composition features of hot in-place recycled mixtures. To establish a mix design method for hot in-place recycled mixtures, the mode of action of rejuvenator was analyzed in this study, and the mix design method for mixtures was optimized by introducing an orthogonal test. The regeneration mechanism of rejuvenators in reclaimed asphalt pavement (RAP) was analyzed, and the optimal working conditions of rejuvenators were determined preliminarily through physical performance, chemical composition, and dynamic shearing rheological tests. In addition, the influences of the dosage of rejuvenator, RAP, and new asphalt on the high-temperature and low-temperature performance and water stability of the recycled asphalt mixture were analyzed through an orthogonal design method by combining trabecular bending rheological, wheel rutting, and freeze-thaw splitting tests. The optimal mix design of the recycled mixture was determined on this basis. According to test results, the rejuvenator and RAP can influence the pavement performance of the recycled mixture more than new asphalt. When the dosage of the rejuvenator is 5% of the total asphalt mass, the proportion of RAP and new asphalt are 80% and 0%, respectively, and the recycling effect of the asphalt mixture is the best. The proposed method is economical and environmentally friendly and has been well applied in ordinary trunk highway maintenance engineering in Hanzhong City, Shaanxi Province, China, since 2017. Research conclusions can provide references for the hot in-place recycling engineering of asphalt pavement. Keywords: Hot in-place recycling, Rejuvenator dosage, RAP, Dynamic shear rheological test, Orthogonal test
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.