Effect of waste EVA (Ethylene Vinyl Acetate) and Waste CR(Crumb Rubber) on characteristics of Bitumen

Abstract

ABSTRACTIn this research, waste Polymer Ethylene Vinyl Acetate (EVA) in three levels 3, 5 and 7 percent and waste crumb rubber in three levels 2, 4 and 6 percent were used as modifier of 85/100 refinery bitumen of Iran. In order to evaluate low temperature behavior of modified bitumen and it's compare with low temperature behavior of base bitumen, Superpave protocol has been used in this way that Bending Beam Rheometer test (BBR) has been done and with measuring creep stiffness indexes and creep rate, low temperature behavior of bitumen has been accounted according to SHRP standard. With doing Bending Beam Rheometer test (BBR), it is realized that these additive caused to improvement features of bitumen low temperature prior to base bitumen. In this way that 3% polymer Ethylene Vinyl Acetate (EVA) and 4% waste crumb rubber are chosen as the optimum mixture. Then with doing Elastic Recovery test, rate of Elastic Recovery of modified bitumen is recognized including different percent of additives and with doing Rotary Viscometer test, viscosity (Pa.s) has been measured for examining pumping ability of modified bitumen.