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Title:

Using Warm-Mix Asphalt Technology to Incorporate High Percentage of Reclaimed Asphalt Pavement Material in Asphalt Mixtures

Accession Number:

01089632

Record Type:

Component

Availability:

Transportation Research Board Business Office

500 Fifth Street, NW
Washington, DC 20001 United States
Order URL: http://www.trb.org/Main/Public/Blurbs/160351.aspx

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Order URL: http://worldcat.org/isbn/9780309113236

Abstract:

The use of reclaimed asphalt pavement (RAP) helps save natural resources and money. The percentage of RAP that can be utilized successfully in hot-mix recycling is primarily dictated by practical considerations. To avoid deterioration of the aged binder, RAP should not be exposed to relatively high temperatures. This study investigated the feasibility of using a warm-mix asphalt (WMA) additive, Sasobit H8, in successfully recycling hot-mix asphalt (HMA) with 75% RAP at a lower temperature. A control HMA was prepared with extracted aggregates and PG (performance grade) 64-28 binder at 150ºC. Another HMA was produced with PG 52-28 binder at 135ºC. Two WMA mixes were prepared with Sasobit H8 at 125ºC, one with PG 52-28 and the other with PG 42-42 binder. Samples with design asphalt content were compacted by using 75 gyrations of the Superpave gyratory compactor. Their voids, tensile strength at –10ºC, rutting potential at 60ºC, and moduli at 0ºC, 25ºC, and 40ºC (at different times) were determined and compared. The moduli samples were subjected to 60ºC in between the tests. The results show that it is possible to produce mixes with 75% RAP with similar air voids as virgin mixes at lower than conventional temperatures using 1.5% Sasobit. The addition of a significantly lower grade of binder, PG 42-42, at a rate of 1.5% by weight of mix produced a mix that is most comparable with a virgin mix.

Monograph Accession #:

01111956

Language:

English

Authors:

Mallick, Rajib B
Kandhal, Prithvi S
Bradbury, Richard L

Pagination:

pp 71-79

Publication Date:

2008

Serial:

Transportation Research Record: Journal of the Transportation Research Board

Issue Number: 2051
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

9780309113236

Media Type:

Print

Features:

Figures (6) ; References (9) ; Tables (3)

Identifier Terms:

Sasobit

Uncontrolled Terms:

Gyratory compaction; Seismic moduli

Subject Areas:

Highways; Materials; I31: Bituminous Binders and Materials

Files:

TRIS, TRB, ATRI

Created Date:

Jan 29 2008 4:54PM

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