Experimental Study of the Effect of Crumb Rubber on Properties of Asphalt Mix by Wet Process

The increase in the number of vehicles during past twenty years has dramatically increased traffic density and axial loading. In addition to construction failures lack periodic maintenance, rapid deterioration road condition happens. So, it was necessary find solutions these problems that have been growing for years. One is improve asphalt mixture resist excessive loads weather fluctuations. This research aims investigate crumb rubber derived from recycled tires; improving performance characteristics compare improved unimproved samples. It worth mentioning considered one smart sustainability world heading towards today, considering comes waste tires, which difficult eliminate pollute environment. Four different proportions added this (6, 9, 12, 15%); by weight bitumen (60-70) binder, with a particle size passing sieve no.50 (0.3 mm). aggregate gradation designed according Marshall method (12.5 mm NMAS) wearing course obtain optimum content prepare laboratory samples perform various tests. Stability flow, indirect tensile strength (ITS), moisture susceptibility, permanent deformation asphaltic mixes contents were investigated. results tested compared original shown when adding certain amount rubber. 29.2% 9% CR bitumen. However, can stiffness resulting more rigid pavement structure less prone damage rutting under load.