01661481

Component

The healing characteristics of asphalt binders affect the fatigue performance of asphalt mixtures and field pavements. The objective of this paper is to quantify the healing potential of asphalt binders using the linear amplitude sweep (LAS) test under various damage levels and rest period durations. A healing protocol based on the LAS test is successfully established to measure the healing behaviour of asphalt binder by applying the rest period before and after cohesive failure. Based on the simplified-viscoelastic continuum damage (S-VECD) model, the percent healing (%Hs) is quantified from the recovery of the accumulated damage growths. From the %Hs results, the N-70 neat binder demonstrates the best healing behaviour in the slight damaged conditions, however, the two SBS modified binders display better healing potential with the growing damage especially in the post-failure cases. The N-30 neat binder shows the worst healing performance. The rest-damage superposition principle (RDSP) is further investigated in the pre-failure cases to remove and unify the effects of damage level and rest period by constructing a %H s mastercurve at a given reference damage level. This developed healing mastercurve and related damage shift factor can be utilized as a material property to represent the intrinsic healing characteristics of a given asphalt binder.

This paper was sponsored by TRB committee AFK20 Standing Committee on Asphalt Binders. Healing Mastercurve of Asphalt Binder Using Linear Amplitude Sweep Test: This is an alternate title.

18-02878

English

4p

2018

Transportation Research Board 97th Annual Meeting

Digital/other

Figures; References; Tables

Bituminous binders; Rheological properties; Torsion tests

Healing (Materials); Linear amplitude sweep tests

Highways; Maintenance and Preservation; Materials; Pavements

Transportation Research Board Annual Meeting 2018 Paper #18-02878

TRIS, TRB, ATRI

Jan 8 2018 10:41AM