TRB Pubsindex
Text Size:
x

« Prev Next »

Return to Results | New Search

Bookmark and Share

Title:

Using Space Diagrams to Evaluate the Effect of Softer Binder and Warm Mix Technologies in Reclaimed Asphalt Pavement Mixtures

Accession Number:

01589809

Record Type:

Component

Abstract:

This study was conducted to investigate if rheological plots of the shear modulus (G*) and the phase angle (δ), commonly known as a Black Space Diagram, and binder rheological parameters derived from master curves using the Christensen-Anderson model (ω₀ – R-value Space diagrams) can be used to evaluate the binder in high Reclaimed Asphalt Pavement (RAP) mixtures in terms of aging and performance. Additionally, these diagrams were utilized to analyze the binder from the same mixtures with the incorporation of Warm Mix Asphalt (WMA) technologies. Finally, mixture performance tests were conducted to validate the results obtained from the binder plots. A Superpave mixture incorporating all virgin materials (no RAP) and a PG64-28 binder was designed. The same mixture was then designed with the incorporation of 15%, 25%, 35% and 50% RAP with the same PG64-28 binder. A PG52-34 softer binder and the PG64-28 with WMA were also used for the 35% and 50% RAP mixtures. The results from the rheological space diagrams were compared to mixture test results for rutting, moisture damage susceptibility and fatigue cracking to determine if they correlate. The rheological space diagrams indicated that increased RAP content led to a binder in the mixture that was more aged than the binder in the virgin material control mixture. The use of the softer PG52-34 binder or a WMA technology decreased the degree of aging with the softer binder being more effective than the WMA technologies. These results generally agreed with the mixture tests.

Supplemental Notes:

This paper was sponsored by TRB committee AFK10 Standing Committee on General Issues in Asphalt Technology.

Monograph Accession #:

01584066

Report/Paper Numbers:

16-1547

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Mogawer, Walaa S
Austerman, Alexander J
Bonaquist, Ramon

Pagination:

15p

Publication Date:

2016

Conference:

Transportation Research Board 95th Annual Meeting

Location: Washington DC, United States
Date: 2016-1-10 to 2016-1-14
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; References; Tables

Uncontrolled Terms:

Moisture susceptibility; Phase angle

Subject Areas:

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

Source Data:

Transportation Research Board Annual Meeting 2016 Paper #16-1547

Files:

TRIS, TRB, ATRI

Created Date:

Jan 12 2016 4:40PM