The rheology of recycled EVA/LDPE modified bitumen |
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Authors: | García-Morales Moisés Partal Pedro Navarro Francisco J Martínez-Boza Francisco Mackley Malcolm R Gallegos Críspulo |
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Institution: | (1) Departamento de Ingeniería Química, Facultad de Ciencias Experimentales, Universidad de Huelva, Campus del Carmen, 21071 Huelva, Spain;(2) Department of Chemical Engineering, University of Cambridge, Cambridge, CB2 3RA, United Kingdom |
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Abstract: | This paper describes linear viscoelasticity, at low and intermediate temperatures, and the flow behaviour, at high temperatures, of polymer modified bitumen (PMB) containing 5 and 9 wt% recycled EVA/LDPE. The relationship between flow behaviour and microstructure of the modified bitumen was also considered, by comparison of experiments carried out in capillary and rotational rheometers and photomicrographs taken using a microscopy system whilst the sample was being sheared. Blends of 60/70 penetration grade bitumen and waste plastic (EVA/LDPE) were processed in an open mixer using a four blade propeller. Rheological tests, differential scanning calorimetry (DSC) and microscopy showed that the bitumen performance was improved by adding the recycled polymer. As a consequence, the use of recycled EVA/LDPE in PMBs can be considered a suitable and interesting alternative from both an environmental and economical point of view. The experimental results also show that pure bitumen has shear-thinning characteristics. The blending of polymer into the bitumen modifies the melt processing characteristics of the blend, whilst the viscoelastic properties of the semi-solid composite are enhanced.This paper was presented at the first Annual European Rheology Conference (AERC) held in Guimarães, Portugal, September 11-13, 2003. |
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Keywords: | Modified bitumen Recycled polymer Flow behaviour Linear viscoelasticity Capillary rheometry |
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