Recycled Waste Plastics Modified Asphalt Concrete in Flexible Pavement for Infrastructure
The constituent materials of the hybrid mixes evaluated in this project comprised the PEN 60/70 bituminous binder, granite aggregate,
waste plastics of different types such LDPE, HDPE, PP, PS and mix plastics. The hybrid mixes followed the LTA SMAgradation but with 10%
LDPE, 10% PP, 25% PS and 2% HDPE plastics substitution of the Pen 60/70 bitumen and incorporating.The study focused mainly on the
investigation of the penetration of bitumen blends with plastics. It was found that bitumen blends with10% LDPE, 10% PP, 25% PS and 2%
HDPEcan give satisfactory performance grade. It is noted that the binder contents of the specimens were also determined using the comparison
between different blends of waste plastics with conventional bitumen.The Marshall mix design method resulted in an chosen binder content of
6.5%. The study focused mainly on the investigation of the stability and flow of SMA with waste plastics. It was found that a hybrid SMA mix
with 10% LDPE, 10% PP, 25% PS and 2% HDPE plastics substitution of the Pen 60/70 bitumen can give satisfactory mixture strength. The
effects of several factors were also investigated.
Index Terms: Flexible pavement, Stone Mastic Asphalt (SMA), Conventional bitumen (Pen 60/70), Polymer Modified Bitumen (PMB),
Waste plastics, Aggregate, Performance grade of bitumen, Penetration, Marshall Stability, Marshall Flow, Mixture strength of asphalt concrete.