Rubber derived from grinding of recycled cars and trucks tyres may be successfully used as a bitumen modifier.Number of researches reported sufficient characteristics of rubber modified asphalt binders or modified asphaltmixes in terms of improved permanent deformation and fatigue cracking. The behavior of crumb rubber asphalt bindersdepends on several factors, such as modification method, rubber content and size, modification temperature, mixingspeed and time applied during the digestion process. The aim of this study is to evaluate the effect of crumb rubberamount and type on modified bitumen low and high temperature properties. This paper presents results of unmodifiedbitumen, crumb rubber crumb rubber and polymer modified bitumen. Low and high temperature properties have beenevaluated using bending beam rheometer and dynamic shear rheometer. Moreover, softening point and viscosity testshave been performed. The study results revealed that crumb rubber modified bitumen performed better than pure bitumenand similarly to polymer modified bitumen.

DOI: https://doi.org/10.3846/enviro.2017.147