چكيده لاتين :
Waste management is a major concern in petrochemical plants. Almost all types
of wastes are used to modify bitumen. Following this concept polymer and
non-polymer wastes of petrochemical production lines were used to modify
bitumen. It was found that incorporation of the wastes separately or as a combination
of some high performing polymer-modified bitumens are obtained. Almost all modifiers
did not improve the low temperature properties of the modified bitumen and in some
cases deteriorated this property. The low molecular weight polyethylene (LMP) and Nmethylpyrrolidone
(NMP) wastes increase high temperature performance of bitumen,
whereas styrene-butadiene rubber (SBR) waste improves low temperature performance
at moderate concentrations. The best performance grades (PG) obtained by introducing
these modifiers are PG = 106-10, PG = 76-22 and PG = 94-16 at a rate of 5%
modification, respectively. The best performance grades obtained with mixtures of NMP
and SBR were PG = 82-16 and PG = 76-22. The most useful performance grades
resulted form incorporation of mixtures of LMP and SBR in bitumen were PG = 94-16
and PG = 100-10. In fact, mixtures of LMP and SBR wastes were found to be the most
beneficial compositions for bitumen modification
