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Rheologica Acta

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24-11-2017 | Original Contribution

Selection of ethylene-vinyl-acetate properties for modified bitumen with enhanced end-performance

Authors: Avido Yuliestyan, Antonio A. Cuadri, Moisés García-Morales, Pedro Partal

Published in: Rheologica Acta | Issue 1/2018

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Abstract

Bitumen modification with ethylene-vinyl acetate (EVA), in a wide range temperatures (between − 30 and 100 °C), has been studied as a function of polymer concentration and EVA characteristics (vinyl acetate (VA) content and melt flow index (MFI)). Viscous flow, dynamic shear (DSR) temperature sweep, and technological tests were conducted to assess binder performance at medium-to-high in-service temperatures. Evaluation of binder low-temperature viscoelastic behavior has been performed using a solid rectangular fixture (SRF) in torsional mode, either in the linear viscoelastic region or under non-linear conditions (by strain breakage tests between − 30 and 0 °C). Further microstructural analysis based on modulated differential scanning calorimetry (MDSC) and optical microscopy was conducted to support rheological and technological results. Hence, total crystalline fraction (related to the VA content and polymer concentration) turned out to be a key parameter to achieve a suitable binder modification at medium-high temperatures. In addition, MFI appears to be an important EVA parameter at low temperatures, as it was found that lower MFI values enhanced resistance to low-temperature cracking.

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Title: Selection of ethylene-vinyl-acetate properties for modified bitumen with enhanced end-performance
Authors: Avido Yuliestyan
Antonio A. Cuadri
Moisés García-Morales
Pedro Partal
Publication date: 24-11-2017
Publisher: Springer Berlin Heidelberg
Published in: Rheologica Acta / Issue 1/2018
Print ISSN: 0035-4511
Electronic ISSN: 1435-1528
DOI: https://doi.org/10.1007/s00397-017-1057-5

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