Abstract
Bitumen is widely used in highway pavement construction. The highway intensity of traffic causes overloading and subsequently contributes to pavement distress i.e. rutting, cracking and disintegration. Hence, to minimize the pavement distress and enhance its durability, conventional bitumen properties need to be improved. An effort has been made by modifying the conventional bitumen with crumb rubber. The physical and rheological properties of crumb rubber modified binder (CRMB) were study by conducting fundamental physical test (including penetration, softening point, ductility, and storage stability) and Dynamic Shear Rheometer (DSR) test. Results indicated that, penetration decreased, and softening point increased, for unaged and short term aged samples, respectively. Temperature susceptibility of CRMB also improved as PI value increased. Moreover, rheology testing exhibited an improvement of G*/sin δ value and increased bitumen’s performance grade (PG) by one level. These properties enhancement indicates greater resistance to rutting.
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