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Bitumens modified with recycled polymers

Content Provider	Springer Nature Link
Author	Murphy, M. O'Mahony, M. Lycett, C. Jamieson, I.
Copyright Year	2000
Abstract	Increasing traffic loading and volumes on roads has led to the use of polymer modified binders to improve the performance of bitumen in terms of additional strength, durability and increased resistance to rutting and fatigue cracking. Generally those modifiers currently in use are virgin polymers but the research investigates the possibility of using waste polymers instead. The aim was to find a recycled polymer modified binder that would be similar to a proven modified binder (Polyflex 75) or would augment the properties of 100 penetration grade bitumen.A wide range of recycled polymers was tested including polyethylenes, polypropylenes, polyetherpolyurethane, ground rubber and truck tyre rubber. Although there were some problems with stability in the bitumen some were found to be successful. The blend with 3% by mass of low density polyethlyene substituted for 1% by mass of sytrene butadiene styrene had similar properties to that of Polyflex 75 although it had a lower stiffness. A combination of ethylene vinyl acetate with low density polyethylene showed similar viscosity to that of a 100 penetration bitumen while having an increased softening point. The blends showing promise need to be subjected to further investigation, in particular to evaluate how these blends perform in optimised bituminous mixes.La charge et le volume croissants de la circulation routière ont conduit à l'emploi de liants modifiés aux polymères pour améliorer les propriétés performantielles du bitume, à savoir le renforcement de la solidité, la durabilité et l'accroissement de la résistance à l'orniérage et aux criques de fatigue. En général les agents modifiants actuellement utilisés sont des polymères vierges, toutefois notre recherche était axée sur la possibilité d'utiliser des déchets plastiques émulsifiés. Le but était de trouver un liant modifié au polymère recyclé similaire à un liant modifié ayant fait ses preuves (Polyflex 75) ou pouvant améliorer les propriétés du bitume de pénétration qualité 100.Une gamme variée de polymères recyclés a été mise à l'essai, comprenant des polyéthylènes, des polypropylènes des polyuréthanes de polyéther, du caoutchouc pilé et du caoutchouc de pneus poids lourds. Bien que certains problèmes de stabilité bitumineuse se soient manifestés, certaines expériences se sont avérées fructueuses. Le mélange à 3% par masse de polyéthylène basse densité substitué à un mélange à 1% par masse de styrène-butadiène-styrène s'est avéré avoir des propriétés similaires à celles du Polyflex 75, en dépit d'une rigidité inférieure. On a obtenu une viscosité similaire à celle d'un bitume de pénétration qualité 100 en mélangeant un acétate de vinyle à l'éthylène avec un polyéthylène à basse densité, tout en maintenant un point de ramollissement supérieur. Les mélanges prometteurs doivent être soumis à de nouvelles analyses, dans le but spécifique d'évaluer la performance de tels mélanges dans des matériaux optimisés au liant hydrocarboné.
Starting Page	438
Ending Page	444
Page Count	7
File Format	PDF
ISSN	13595997
Journal	Materials and Structures
Volume Number	33
Issue Number	7
e-ISSN	18716873
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2000-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Theoretical and Applied Mechanics Structural Mechanics Mechanical Engineering Operating Procedures, Materials Treatment Civil Engineering Building Materials
Content Type	Text
Resource Type	Article
Subject	Building and Construction Mechanics of Materials Materials Science Civil and Structural Engineering

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