01698411

Component

As an intrinsic property of asphalt material, self-healing could reverse the cracking process in asphalt pavements and extend the pavement service life. The present study provides quantitative assessment of self-healing of thermally-induced damage in asphalt concrete materials through conducting Acoustic Emission (AE) as well as Disk-shaped Compact Tension (DCT) tests. Asphalt concrete specimens were subjected to eight cooling cycles and effects of resting time between cooling cycles on self-healing were investigated. The AE test results showed gradual degradation in self-healing capability of asphalt mixtures as the material was exposed to several cooling cycles. However, it was observed that rate of self-healing degradation was not constant as it was higher at the beginning and then gradually reduced until it reached a plateau after the fourth cooling cycle. In addition, AE results indicated that the 12 hours resting time between cooling cycles significantly improved the self-healing by more than 30% and allowed the material to regain most of its self-healing capabilities. DCT test results were consistent with findings from AE test indicating that both approaches could successfully capture the effect of resting time on fracture energy of the material. Results also showed that the fracture energies of asphalt mixtures were increased on the average by 13% due to the 12 hours of resting time.

This paper was sponsored by TRB committee AFK50 Standing Committee on Structural Requirements of Asphalt Mixtures.

19-03246

English

6p

2019

Transportation Research Board 98th Annual Meeting

Digital/other

References

Acoustic emission tests; Asphalt mixtures; Asphalt pavements; Thermal degradation

Disc compact tension tests; Fracture energy; Self-healing (Materials)

Highways; Materials; Pavements

Transportation Research Board Annual Meeting 2019 Paper #19-03246

TRIS, TRB, ATRI

Dec 7 2018 9:25AM