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Title:

Comparison of Laboratory Performance of Asphalt Mixes Containing Different Proportions of RAS and RAP

Accession Number:

01594657

Record Type:

Component

Abstract:

Despite environmental and economic advantages associated with incorporating recycled asphalt shingles (RAS) and reclaimed asphalt pavement (RAP) in hot-mix asphalt (HMA), concerns focus on fatigue and low-temperature cracking potential of pavements containing RAS and RAP. This study was undertaken to identify the areas in need for research through conducting a national survey among departments of transportation and to evaluate the effects of RAS and RAP on fatigue, low-temperature cracking and stiffness of HMA. National survey results indicated that while the fatigue cracking is the major concern when RAS and/or RAP are used in mixes, no specific test is recommended for fatigue evaluation of these mixes at the mix design stage. Laboratory test results revealed that the fatigue life of mixes with a non-polymer-modified binder containing a blend of 5% RAS and 5% RAP led to the maximum increase in fatigue life, while using 6% RAS decreased the fatigue life, when compared with that of virgin mix. However, the use of a polymer-modified binder was found as an effective way to increase the fatigue life of the mixes. Also, it was found that addition of RAS and/or RAP to asphalt mixes increased their dynamic moduli which may result in a better rutting performance. From creep compliance test results it was concluded that use of RAS and/or RAP may lead to a higher low- temperature cracking potential when compared with the virgin mixes. Findings of this study can be used to develop/update guidelines/special provisions for design of HMA containing RAS and RAP.

Supplemental Notes:

This paper was sponsored by TRB committee AFK30 Standing Committee on Characteristics of Nonasphalt Components of Asphalt Paving Mixtures.

Monograph Accession #:

01584066

Report/Paper Numbers:

16-4571

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Ghabchi, Rouzbeh
Barman, Manik
Singh, Dharamveer
Zaman, Musharraf
Mubaraki, Muhammad Ali

Pagination:

18p

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

Subject Areas:

Highways; Materials; Pavements

Source Data:

Transportation Research Board Annual Meeting 2016 Paper #16-4571

Files:

TRIS, TRB, ATRI

Created Date:

Jan 12 2016 6:01PM