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Materials 2014, 7(9), 6254-6280; doi:10.3390/ma7096254

Microstructural Analysis and Rheological Modeling of Asphalt Mixtures Containing Recycled Asphalt Materials

1
Pavement Engineering Centre (ISBS), Technische Universität Braunschweig, Beethovenstraße 51b, Braunschweig 38106, Germany
2
Material R&D Division, Samsung C&T Corporation, 5th Floor Daeryung Gangnam Tower, 826-20, Yeoksam 1-Dong, Gangnam-Gu, Seoul 135-935, Korea
*
Author to whom correspondence should be addressed.
Received: 12 June 2014 / Revised: 17 August 2014 / Accepted: 27 August 2014 / Published: 2 September 2014
(This article belongs to the Special Issue Recycled Materials)
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Abstract

The use of recycled materials in pavement construction has seen, over the years, a significant increase closely associated with substantial economic and environmental benefits. During the past decades, many transportation agencies have evaluated the effect of adding Reclaimed Asphalt Pavement (RAP), and, more recently, Recycled Asphalt Shingles (RAS) on the performance of asphalt pavement, while limits were proposed on the amount of recycled materials which can be used. In this paper, the effect of adding RAP and RAS on the microstructural and low temperature properties of asphalt mixtures is investigated using digital image processing (DIP) and modeling of rheological data obtained with the Bending Beam Rheometer (BBR). Detailed information on the internal microstructure of asphalt mixtures is acquired based on digital images of small beam specimens and numerical estimations of spatial correlation functions. It is found that RAP increases the autocorrelation length (ACL) of the spatial distribution of aggregates, asphalt mastic and air voids phases, while an opposite trend is observed when RAS is included. Analogical and semi empirical models are used to back-calculate binder creep stiffness from mixture experimental data. Differences between back-calculated results and experimental data suggest limited or partial blending between new and aged binder. View Full-Text
Keywords: recycling; reclaimed asphalt pavement; manufacturer waste scrap shingles; tear-off scrap shingles; microstructure; creep stiffness; back-calculation recycling; reclaimed asphalt pavement; manufacturer waste scrap shingles; tear-off scrap shingles; microstructure; creep stiffness; back-calculation
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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MDPI and ACS Style

Falchetto, A.C.; Moon, K.H.; Wistuba, M.P. Microstructural Analysis and Rheological Modeling of Asphalt Mixtures Containing Recycled Asphalt Materials. Materials 2014, 7, 6254-6280.

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