RILEM TC 279 WMR round robin study on waste polyethylene modified bituminous binders
advantages and challenges
M. Tušar (Slovenian National Building and Civil Engineering Institute, National Institute of Chemistry, Ljubljana)
M. R. Kakar (Swiss Federal Laboratories for Materials Science and Technology (Empa), Bern University of Applied Sciences)
Lily D. Poulikakos (Swiss Federal Laboratories for Materials Science and Technology (Empa))
E. Pasquini (Università degli Studi di Padova)
Andrea Baliello (Università degli Studi di Padova)
Marco Pasetto (Università degli Studi di Padova)
L. Porot (Kraton Chemical B.V.)
Di Wang (Technical University of Braunschweig)
Davide Lo Presti (Università degli Studi di Palermo)
A Varveri (TU Delft - Pavement Engineering)
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Abstract
Inter-laboratory experiments were designed to evaluate the impact of plastic waste blended directly in bitumen and to assess the properties, using conventional and advanced bituminous binder testing. The blends targeted 5% of plastic waste in 95% bitumen, using two types of polyethylene (PE) primary (pellets) and secondary (shreds) waste. The experiments showed that the addition of PE waste to bitumen does not alter the chemistry of the bitumen, the blending is physical. The DSR results indicate a strong dependency on the testing temperature as at low temperatures the composite material bitumen and PE behave both elastically whereas, at higher temperatures, the bitumen becomes viscoelastic. The MSCR tests indicated that the neat binder is more sensitive to permanent deformation compared to the blends with PE. The fatigue performance using the Linear Amplitude Sweep test showed a better performance in terms of stress and fatigue life for the PE blends.