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Effect of foaming technique and mixing temperature on the rheological characteristics of fine RAP-foamed bitumen mixtures

S�nchez, Diana B.; Airey, Gordon; Caro, Silvia; Grenfell, James

Effect of foaming technique and mixing temperature on the rheological characteristics of fine RAP-foamed bitumen mixtures Thumbnail


Authors

Diana B. S�nchez

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GORDON AIREY GORDON.AIREY@NOTTINGHAM.AC.UK
Professor of Pavement Engineering Materials

Silvia Caro

James Grenfell



Abstract

This paper evaluates and compares the differences in the rheological characteristics of the fine aggregate matrix (FAM) portion of plant produced Foamed Bitumen Mixtures (FBMs) by means of a mechanical foaming process, and by the incorporation of zeolites in combination with Reclaimed Asphalt Pavement (RAP) material. This evaluation explores, for the first time, the impact of plant production variations for half-warm, warm and hot processes (i.e. mixing temperatures around 90°C, 120°C and 160°C, respectively) on their rheological response. A fine Virgin-HMA, a fine HMA-RAP – no foaming technique -, and a 100% fine RAP mixture were also produced for comparison purposes. Dynamic Mechanical Analysis (DMA) tests were conducted on all evaluated FAM mixtures to determine their linear viscoelastic properties. Results indicate that the rheological response of the fine RAP-FBMs is influenced primarily by the contribution of the RAP binder in the total bitumen blend, and ageing of the fine RAP material, which were a function of the foaming technology and the production temperature of the materials.

Journal Article Type Article
Acceptance Date Feb 25, 2019
Online Publication Date Mar 19, 2019
Publication Date 2020
Deposit Date Apr 12, 2019
Publicly Available Date Mar 20, 2020
Journal Road Materials and Pavement Design
Print ISSN 1468-0629
Electronic ISSN 2164-7402
Publisher Taylor and Francis
Peer Reviewed Peer Reviewed
Volume 21
Issue 8
Pages 2143-2159
DOI https://doi.org/10.1080/14680629.2019.1593228
Keywords Civil and Structural Engineering
Public URL https://nottingham-repository.worktribe.com/output/1793321
Publisher URL https://www.tandfonline.com/doi/full/10.1080/14680629.2019.1593228
Additional Information This is an Accepted Manuscript of an article published by Taylor & Francis in Road materials and Pavement Design on 19/03/2019, available online: http://www.tandfonline.com/10.1080/14680629.2019.1593228

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