Performance of Asphalt Mixtures with High Recycled Contents Using Rejuvenators and Warm-Mix Additives: Field and Laboratory Experiments
To improve the cracking resistance of asphalt mixtures with high recycled asphalt pavement (RAP) and reclaimed asphalt shingles (RAS) contents, one approach is to use a recycling agent (RA) (i.e., rejuvenator) to potentially restore the performance properties of the aged binder. This project was conducted to evaluate the effect of RAs on the laboratory test results and field performance of mixes with high recycled contents. The field study consisted of three mixtures: a control mix containing 20% RAP and no RA, and two experimental mixes with different rejuvenators containing 25% RAP and 5% RAS. The control mix was produced at a typical hot-mix asphalt (HMA) production temperature (300°F), while the experimental mixes were produced as warm-mix asphalt (WMA) (265°F). Two rejuvenators were used in the study. This paper presents data collected during the construction of the test sections, laboratory test results, and early field performance (approximately two years). Compared to the control mix, both the experimental mixes with 25% RAP plus 5% RAS showed similar rutting resistance but significantly lower resistance to cracking based on lab test results and field performance data. The lab test results, especially for overlay test (OT) and Illinois flexibility index test (I-FIT), are in agreement with the field cracking performance of these mixes—the experimental mixes with OT cycles below 125 and flexibility indices below 3 cracked within two years in the field. Thus, further research can be conducted to refine these criteria for use in mix design and/or quality control/quality assurance (QC/QA) to avoid premature mixture cracking in the future.
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Supplemental Notes:
- This paper was sponsored by TRB committee AFK30 Standing Committee on Non-Binder Components of Asphalt Mixtures. Alternate title: Performance of Asphalt Mixtures with High Recycled Contents Using Rejuvenators and Warm Mix Additives: Field and Laboratory Experiments.
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Corporate Authors:
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Authors:
- Xie, Zhaoxing
- Tran, Nam
- Julian, Grant
- Taylor, Adam J
- Blackburn, Lyndi Davis
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Conference:
- Transportation Research Board 96th Annual Meeting
- Location: Washington DC, United States
- Date: 2017-1-8 to 2017-1-12
- Date: 2017
Language
- English
Media Info
- Media Type: Digital/other
- Features: Figures; Photos; References; Tables;
- Pagination: 19p
- Monograph Title: TRB 96th Annual Meeting Compendium of Papers
Subject/Index Terms
- TRT Terms: Asphalt mixtures; Cracking; Field tests; Laboratory tests; Reclaimed asphalt pavements; Rejuvenators; Rutting; Shingles; Warm mix paving mixtures
- Subject Areas: Highways; Materials; Pavements;
Filing Info
- Accession Number: 01628818
- Record Type: Publication
- Report/Paper Numbers: 17-05097
- Files: TRIS, TRB, ATRI
- Created Date: Mar 13 2017 4:05PM