01478807

Component

Several treatments of the interface between binder and wearing courses are presented and their results may be used for outlining possible ways to improve the interlayer bond strength. The investigated operations are performed on hot binder course, by roughening the binder surface so to ensure a better locking (tracks of a toothed compactor roller, chip coat with different sizes and materials), and on cold binder course, by simulating the operation of overlay with the traditional techniques (hot bitumen and tack coats for two residual application rates) along with furrowed, dirty or smooth binder course surface. The shear strength features are evaluated through the Sapienza Inclined Shear Test Machine. According to the achievements, all the interface treatments show an improvement in the shear behavior in comparison with the case with no treatment. The operations performed on binder course to modify its surface record a considerable improvement of the shear strength. In contrast to the expectations, the higher results are achieved by those treatments intended to reproduce pejorative condition of the interface.

This paper was sponsored by TRB committee AFK40 Characteristics of Asphalt-Aggregate Combinations to Meet Surface Requirements.

01470560

13-3020

English

14p

2013

Transportation Research Board 92nd Annual Meeting

Digital/other

Figures; Photos; References; Tables

Binder course; Bond strength (Materials); Flexible pavements; Hot mix asphalt; Interfaces; Pavement interlayers; Shear strength; Wearing course (Pavements)

Highways; Materials; Pavements; I31: Bituminous Binders and Materials

Transportation Research Board Annual Meeting 2013 Paper #13-3020

TRIS, TRB, ATRI

Feb 5 2013 12:37PM