Iranian polymer journal, 2010(No. 3)



Title:
Properties of Modified Bitumen Obtained from Vacuum Bottom by Adding Recycled Waste Polymers and Natural Bitumen


Author(s):
Ali Akbar Yousefi ، Seyyed Bagher Mortazavi ، Yahya Rasoulzadeh ، Ali Khavanin

Language: English


Abstract:
Post-consumer waste polymers are considered as environmental pollutants that
should be reused as inexpensive materials. Also, there are resources of natural
bitumen in several regions of Iran that can be used to modify bitumen. The
purpose of this study is to investigate the possibility of obtaining penetration grade
modified bitumen from vacuum bottom residue (VB) by adding various recycled waste
polymers and non-polymer materials without air blowing VB. Following this concept,
natural bitumen (NB), recycled waste polyethylene (PE), recycled waste latex, crump
rubber modifier (CRM) and heavy vacuum slopes (HVS) were used. The formulation of
mixing blends was determined by experimental design method using design-expert
V.7.16 software. It was found that 40/50, 60/70 and 85/100 grades of penetration
bitumen with improved performance grades, 82-40, 70-40 and 70-40, respectively, are
producible using these materials, although, decreased ductility is observed almost for
all the blends. A combination of 10% natural bitumen and 5% recycled latex with VB are
considered as the best blend amongst all blends. The resulting modified 60/70 grade
bitumen shows improved complex modulus in comparison with neat 60/70 bitumen and
consequently it has increased resistance against permanent deformation (rutting). Also,
the lowered Frass breaking point of this blend (-21°C) improved its low temperature
performance (PG = 70-40). Unfortunately, when the crump rubber modifier particles are
not well-dispersed and fine enough in bitumen matrix, there is an unexpected
decreased ductility occurred in the blends.

Keywords:
waste; polymer;polymer; recycling; modification; bitumen.



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