Laboratory Evaluation of SMA Mixes Prepared with SBS Modified and Neat Bitumen

This paper reports about the experimental investigations carried out on stone matrix asphalt mixes (SMA) prepared using polymer modified bitumen PMB 70 with SBS and coconut fibers to prevent drain down of asphalt. Results were compared with SMA mixes prepared with neat bitumen VG 30 grade and coconut and cellulose fibers to prevent drain down of asphalt. Experimental work includes SMA mix design, static indirect tensile strength test at different temperatures, indirect tensile fatigue test and permanent deformation test. From the test results it was observed that stone matrix asphalt mix with PMB 70 and coconut fiber shows higher static indirect tensile strength at different temperatures, higher fatigue life and higher rut resistance when compared to control mix of SMA