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Rheological properties of SEBS, EVA and EBA polymer modified bitumens

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Abstract

The rheological properties of various polymer modified bitumens were studied. Three bitumens from two different sources were mixed with styrene-ethylenbutylene-styrene (SEBS), ethylene vinyl acetate (EVA) and ethylene butyl acrylate (EBA) copolymers at different polymer contents. The rheological properties of the modified binders were investigated by means of dynamic mechanical analysis and creep test (bending beam rheometer). The results indicated that polymer modification increased binder elastic responses and dynamic moduli at intermediate and high temperatures, and reduced binder complex and stiffness moduli at low temperatures. Polymer modification also reduced temperature susceptibility, glass transition temperature as well as limiting stiffness temperature. The degree of the improvement generally increased with polymer content, but varied with bitumen source/grade and polymer type.

Résumé

Les propriété rhéologiques de divers bitumes modifiés ont été étudiées. Trois bitumes de deux origines différentes ont été mélangés avec les copolymères styrène-éthylènebutylène-styrène (SEBS), éthylène-vinyl-acétate (EVA) et éthylène-butyl-acrylate (EBA), en utilisant différents pourcentages de polymère. Les propriétés rhéologiques des différents liants modifiés ont été examinées au moyen d’essais dynamiques et d’essais de fluage (bending beam rheometer). Les résultats montrent que l’ajout de polymère augmente la réponse élastique du liant et le module dynamique aux températures moyennes et hautes, et diminue le module complexe et le module de rigidité à basse température. L’ajout de polymère diminue la susceptibilité thermique, la température de transition vitreuse et la température de «rigidité limite». Le degré d’amélioration augmente généralement avec le pourcentage de polymère, mais il varie avec l’origine et la nature du bitume, et le type de polymère.

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Authors and Affiliations

  1. Division of Highway Engineering, Royal Institute of Technology, S-100 44, Stokholm, Sweden

    X. Lu, U. Isacsson & J. Ekblad

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  1. X. Lu
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  2. U. Isacsson
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  3. J. Ekblad
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Editorial Note Prof. Ulf Isacsson is a RILEM Senior Member, he works at the Royal Institute of Technology, a RILEM Titular Member.

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Lu, X., Isacsson, U. & Ekblad, J. Rheological properties of SEBS, EVA and EBA polymer modified bitumens. Mat. Struct. 32, 131–139 (1999). https://doi.org/10.1007/BF02479440

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  • DOI: https://doi.org/10.1007/BF02479440

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