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 SMA gradation 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% HDPE can 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.