01625819

Component

The aging process suffered by asphalt binders interferes directly in the mechanical properties of hot mix asphalt (HMA) mixes. In order to avoid an excessive hardening of the asphalt binder, the specifications limit certain aging indices or aging parameters. However, asphalt binder specifications do not take account of the effect of the ultraviolet radiation (UV) on the rheological properties of such materials. The objectives of this work are (i) to quantify the effects of the UV radiation on the rheological properties of a 50/70 pen-grade asphalt cement (AC) and five asphalt binders modified with polyphosphoric acid (PPA) and styrene butadiene styrene (SBS) and styrene butadiene rubber (SBR) copolymers (AC+PPA, AC+SBS, AC+SBS+PPA, AC+SBR and AC+SBR+PPA) and (ii) to compare the aging levels caused by UV radiation with the aging level in the pressure aging vessel (PAV). The samples aged in the PAV and in the weatherometer were previously aged in rolling thin film oven (RTFO). The use of modifiers increased the resistance to long-term aging of the materials, either in the PAV or in the weatherometer. The binder+SBR+PPA showed the best performance in terms of aging resistance.

This paper was sponsored by TRB committee AFK20 Standing Committee on Asphalt Binders. Alternate title: Evaluation of the Effects of Ultraviolet Radiation on the Rheological Properties of Asphalt Binders Modified with PPA and SBS and SBR Copolymers.

01618707

17-05313

English

14p

2017

Transportation Research Board 96th Annual Meeting

Digital/other

Figures; Photos; References; Tables

Aging (Materials); Asphalt cement; Bituminous binders; Rheological properties; Styrene butadiene rubber; Styrene butadiene styrene; Ultraviolet radiation; Weathering

Polyphosphoric acid; Pressure aging vessels; Rolling thin film oven test

Highways; Materials; Pavements

Transportation Research Board Annual Meeting 2017 Paper #17-05313

TRIS, TRB, ATRI

Dec 8 2016 12:05PM