Evaluation of the degradation of fine asphalt-aggregate mixtures containing high reclaimed asphalt pavement contents

Sánchez, Diana B. and Grenfell, James and Airey, Gordon and Caro, Silvia (2017) Evaluation of the degradation of fine asphalt-aggregate mixtures containing high reclaimed asphalt pavement contents. Road Materials and Pavement Design, 18 (sup2). pp. 91-107. ISSN 1468-0629

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Abstract

This paper evaluates the mechanical properties and performance of the fine aggregate matrix (FAM) existing within full reclaimed asphalt pavement (RAP) asphalt mixtures, in terms of their rheological and fatigue deterioration properties. The RAP material was produced in the laboratory to control its properties and to reduce the effects of variability associated with these materials. Four FAM mixtures were analysed, including a virgin hot mix asphalt, a 100%RAP, and two mixtures containing 50% RAP in combination with virgin materials using different penetration grade virgin binders. The analysis of the deterioration properties was based on the application of a fracture model that incorporates the viscoelastic properties of the material, the quality of the adhesive bonds developed between the aggregates and the corresponding bitumen present in each mixture, and the rate at which the material dissipates energy when subjected to cycling loading. The input parameters for this model include the results obtained from dynamic mechanical analysis and surface free energy tests. In general, the results showed that the incorporation of 50% RAP content increased the stiffness of the final mixtures, as expected. However, this hardening effect did not result in mixtures with inferior fatigue performance of the FAM present in the full mixtures, at the applied strain level.

Item Type: Article
Additional Information: This is an Accepted Manuscript of an article published by Taylor & Francis in Road Materials and Pavement Design on 29 March 2017, available online: http://www.tandfonline.com/10.1080/14680629.2017.1304250
Keywords: Reclaimed Asphalt Pavement (RAP); Fine Aggregate Matrix (FAM); Dynamic Mechanical Analysis (DMA), Surface Free Energy (SFE), Viscoelastic properties, Fatigue
Schools/Departments: University of Nottingham, UK > Faculty of Engineering
Identification Number: 10.1080/14680629.2017.1304250
Depositing User: Eprints, Support
Date Deposited: 12 Apr 2017 11:51
Last Modified: 13 Oct 2017 01:10
URI: http://eprints.nottingham.ac.uk/id/eprint/41897

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