A Study on the Rheological Performance of a Nanoclay-Modified Asphalt Binder Using the Brookfield Viscometer and Dynamic Shear Rheometer

Asphaltic pavement suffers from major distresses such as rutting, and fatigue cracking. To mitigate these problems, stiffer grade or binders modified with polymer or crumb rubber is being practiced. These modified binders are expensive and can pose storage stability problems due to phase separation at high temperature Recently, asphalt binder modified with organo modified nanoclay reported to be an excellent alternative to improve rutting and fatigue performance. The present study deals with rutting and fatigue performance of asphalt binder (AC-10) modified with organo modified nanoclay (CL-30B). Different percentages (0, 2, 4 and 6% by weight of binder) of CL-30B were mixed with AC-10 using high shear mixer. Different performance studies such as Brookfield viscosity, Multiple Stress Creep Recovery (MSCR) and Linear Amplitude Sweep (LAS) were conducted on modified and unmodified binders. The results showed improvement in rutting and fatigue performance of asphalt binder with addition of CL-30B.