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Title:

Rheological Characterization of Short- and Long-Term Aged Binders Recovered from Recycled Asphalt Mixes

Accession Number:

01626249

Record Type:

Component

Abstract:

It is widely accepted that using reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS) can improve the sustainability of asphalt concrete (AC) due to cost savings and environmental factors when short- and long-term pavement performance is not compromised. This paper presents an experimental evaluation of the rheological properties of binders from various sources to investigate the effects of aging and increasing asphalt binder replacement (ABR) levels. In addition to the standard Superpave grading parameters, the additional rheological parameters for low-temperature cracking susceptibility and block and fatigue cracking were derived from various dynamic shear rheometer (DSR) and bending beam rheometer (BBR) tests. Binders from five AC designed with varying ABR percentages (0 to 60%) were recovered using the standard Rotovap test procedure. The base binder used in the AC design and binders recovered from RAP and RAS were also tested. In addition to standard aging protocols, base binders were subjected to a second pressure aging vessel (PAV) whereas one PAV was applied for the extracted binders. Almost all additional rheological parameters appeared to have consistent trends with aging and increasing ABR levels. The considered parameters are shown to be helpful in evaluating progression in brittleness of binders with ABR and aging. Based on the outcome of the experimental program, it was concluded that AC with ABR levels above 20 percent could suffer from short- and long-term cracking potential. Asphalt concrete with high ABR content can be at an already critically aged condition right after production and in addition to that aging progresses much faster in the binders of such mixes.

Supplemental Notes:

This paper was sponsored by TRB committee AFK10 Standing Committee on Critical Issues and Emerging Technologies in Asphalt.

Monograph Accession #:

01618707

Report/Paper Numbers:

17-06273

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Ozer, Hasan
Ma, Jing
Al-Qadi, Imad L
Sharma, Brajendra Kumar

Pagination:

18p

Publication Date:

2017

Conference:

Transportation Research Board 96th Annual Meeting

Location: Washington DC, United States
Date: 2017-1-8 to 2017-1-12
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; References; Tables

Uncontrolled Terms:

Pressure aging vessels

Subject Areas:

Highways; Materials; Pavements

Source Data:

Transportation Research Board Annual Meeting 2017 Paper #17-06273

Files:

TRIS, TRB, ATRI

Created Date:

Dec 8 2016 12:33PM