01698433

Component

The objective of this study is to evaluate the effect of different additive agents on the healing performance of asphalt mixtures suffering from moisture damage. In addition, the moisture resistance due to additive agents was also examined by conducting Indirect Tensile Strength (ITS) test. A PG64-22 bitumen was modified with several additives, including 2 types of anti-stripping agent (ASA) and 2 types of rejuvenator. To improve the healing performance and accelerate temperature attainment, steel wool fibers (SWF) were introduced into the asphalt mixture for microwave and induction heating. All test specimens were further categorized into 4 different freeze-thaw (FT) cycles. The results indicated that mixing asphalt binder with additives improves the moisture resistance as well as the tensile strength of asphalt mixtures. A total of 8 damage-healing (DH) cycles were applied to all asphalt mixtures, examined by Three-Point Bending (TPB) test. It suggested that adding rejuvenator provides a better healing performance for all mixes. Optimum healing was observed at 2 to 3 damage-healing cycles for both healing treatments. Overall, asphalt mixtures modified with additive agents not only obtained higher moisture resistance but also gained better healing performance under repetitive FT cycles.

This paper was sponsored by TRB committee AFK30 Standing Committee on Non-Binder Components of Asphalt Mixtures.

19-00287

English

0000-0001-8696-9207

5p

2019

Transportation Research Board 98th Annual Meeting

Digital/other

Figures; References

Antistrip additives; Asphalt additives; Freeze thaw tests; Hot mix asphalt; Induction heating; Moisture damage; Rejuvenators; Steel fibers

Healing (Materials); Indirect tensile strength; Microwave heating; Moisture resistance

Highways; Materials; Pavements

Transportation Research Board Annual Meeting 2019 Paper #19-00287

TRIS, TRB, ATRI

Dec 7 2018 9:38AM