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Title:

First Observation of Blending-Zone Morphology at Interface of Reclaimed Asphalt Binder and Virgin Bitumen

Accession Number:

01474873

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/Blurbs/169955.aspx

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Order URL: http://worldcat.org/isbn/9780309286886

Abstract:

One of the challenges in designing recycled asphalt mixtures with a high amount of reclaimed asphalt pavement (RAP) is estimating the blending degree between RAP binder and added virgin bitumen. The extent of blending is crucial because asphalt concrete response is influenced by the final binder properties. This paper focuses on the evaluation of interaction and extent of blending between RAP binder and virgin bitumen by studying the microstructures of the blending zone with atomic force microscopy (AFM). AFM is used to probe the change of microstructural properties from a RAP binder and virgin bitumen to the blending zone of these two. Averaged microstructural properties have been observed in thin-film blends of RAP binder and pure bitumen. The morphology of the blending zone (spatial extent of about 50 µm) exhibits domains of a wide range of microstructure sizes (160 nm to 2.07 µm) and can be considered to be a completely blended new material that has been observed directly for the first time. The fully blended binder properties are found to be between those of the two individual binders, as could be inferred from the averaged microstructural properties derived from AFM images of the blending zone. This finding is also consistent with the results of mechanical tests by dynamic shear rheometer on the same materials. Finally, a design formula is proposed that relates the spatial dimensions of the blending zone to temperature and mixing time, which will eventually allow the results of this study to be extended from small-length scales up to the engineering level.

Monograph Accession #:

01500280

Report/Paper Numbers:

13-0763

Language:

English

Authors:

Nahar, S N
Mohajeri, M
Schmets, A J M
Scarpas, A
van de Ven, M F C
Schitter, G

Pagination:

pp 1-9

Publication Date:

2013

Serial:

Transportation Research Record: Journal of the Transportation Research Board

Issue Number: 2370
Publisher: Transportation Research Board
ISSN: 0361-1981

ISBN:

9780309286886

Media Type:

Print

Features:

Figures (7) ; Photos; References (33) ; Tables (1)

Subject Areas:

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

Files:

TRIS, TRB, ATRI

Created Date:

Feb 5 2013 12:16PM

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