ISSN 2319-5347, ISI Impact Factor: 0.763

VOLUME 04  NO. 03 JULY 2015:

Title:         Performance Evaluation of Flexible Pavement against Rutting
Authors:Muhammad Hussain, Zia ur Rehman, Yousaf Ali
Abstract:   Asphalt is the major part of wearing surface of road structure. Asphalt plays a key role as a binder.So, it has been modified a number of times against its failures. So, modifiers like Polyethylene, crumb rubber and lime etc are added to improve its properties to increase its rut resistance. Modified asphalt is much better to control rut resistance in pavements. In this research, the performance of Polyethylene, lime and elvaloy modified asphalt is studied regarding rutting resistance and it is compared with the performance of conventional NHA (National Highway Authority Pakistan) Class-A mix .So compacted asphalt mixes were tested for resistance to rutting by subjecting all the specimens to 10,000 cycles of loaded wheel and the rut depth for eac specimen was determined using wheel tracking machine. The performance of Polyethylene modified asphalt provides better resistance to rutting than all the other mixes. The conventional NHA class-A mix showed the poorest performance. The performance of polyethylene modified asphalt is better than lime modified asphalt,and elvaloy modified asphalt is better than conventional (unmodified) NHA class-A mix. Results shows that better quality asphalt concrete mixes regarding rut resistance can be prepared using lime modified asphalt,polyethylene modified asphalt and polymer modified bitumen (PMB) instead of unmodified bitumen..
Keywords:Hot Mix Asphalt (HMA), Rutting, Low Density Polyethylene (LDPE), hydrated lime, PMB, Wheel tracker.

pages           190-192

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