Reliability-Based Recycling of Reclaimed Asphalt Pavement Using a t-Distribution Guarantee Rate Method and a Ternary Composite Rejuvenation System
Yuanyuan Li, Bowen Hu, Kefeng Bi, Chonghui Wang, Hongbin Zhu, Gangping Jiang
TL;DR
This study improves the use of reclaimed asphalt pavement by developing a reliable method for material selection and a ternary system to restore aged asphalt performance.
Contribution
A novel t-distribution guarantee rate method and a ternary composite rejuvenation system for reclaimed asphalt pavement are introduced.
Findings
The t-distribution method effectively quantifies gradation fluctuations in reclaimed asphalt pavement.
A 10% addition of Rejuvenator 1 restored high-temperature performance of aged asphalt.
Adding 30% SBS-modified asphalt improved low-temperature crack resistance without forming new functional groups.
Abstract
Large-scale use of reclaimed asphalt pavement (RAP) is limited by strong gradation variability, uneven recovery of aged asphalt (AA), and an incomplete understanding of the rejuvenation mechanism. This study combines source evaluation, composite rejuvenation, and multi-scale analysis to improve AA recovery. A gradation variability model was developed using the t-distribution, and a reliability-based method was proposed for reclaimed material selection and mix design. Rejuvenator 1 (R1) was identified as the best option, and a ternary composite rejuvenation system was formed using R1, SBS-modified asphalt, and base asphalt (BA). AA performance was assessed using physical and rheological tests, supported by Fourier-transform infrared spectroscopy, fluorescence microscopy, and gel permeation chromatography. The t-distribution guarantee rate method quantified RAP gradation fluctuations…
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Taxonomy
TopicsAsphalt Pavement Performance Evaluation · Infrastructure Maintenance and Monitoring · Petroleum Processing and Analysis