Performance of OMMT/SBS on the rheological properties of asphalt binder
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Performance of OMMT/SBS on the rheological properties of asphalt binder Peerzada Mosir Shah* and Mohammad Shafi Mir Civil Engineering Department, National Institute of Technology, Srinagar 190006, India (Recieved February 10, 2020; final revision received April 9, 2020; accepted June 27, 2020) Nanoclays have been successfully introduced into the asphalt binder, either separately or into the polymer modified asphalt binder resulting in the improved mechanical and rheological properties of the asphalt binder. The present research study was undertaken to evaluate the influence of organically modified montmorillonite clay (OMMT) in pure asphalt binder and also in styrene butadiene styrene (SBS) modified asphalt binder. The quantity of OMMT and SBS was varied from 2-6 percent by the weight of the base asphalt binder. The addition of OMMT in an appropriate amount can dramatically enhance the compatibility between SBS and base asphalt. It was observed from the results that modified binders exhibited higher Superpave rutting parameter (G*/sinĪ“) indicating an improvement in the stiffness of the binder. It was also observed that modified binders (OMMT/SBS) does not exhibit phase separation under high temperatures. Thus high temperature stoage stability could be improved by choosing a proper amount of OMMT and forming an exfoliated structure. Thus it can be concluded that OMMT added to the polymer modified binder (SBS) helps in obtaining better physical and rheological properties on a condition that clay scatters into the binder at the nanoscopic level. Keywords: organically modified montmorillonite clay (OMMT), styrene butadiene styrene (SBS), Fourier transform infrared spectroscopy (FTIR), viscosity, aging, rheological tests, storage stability
1. Introduction Asphalt binder has been widely used in the preparation of roads and runways because of its impressive viscoelastic behavior (Loeber et al., 1998). Asphalt binder is an organic combination of multiple chemical compounds. As the asphalt binder is exposed to heat, oxygen and ultraviolet (UV) rays, the physical features and chemical structure of the asphalt binder changes thus the binder is susceptible to aging (Lamontagne et al., 2001; Ruan et al., 2003). From the past study, it was noted that the inclusion of modifiers leads to better physical and rheological properties of the binder based on the type and dosage of the modifier (Abdullah et al., 2016; Wang et al., 2016). The ideal asphalt binder should posses the following features (i) it should provide high temperature rutting strength (ii) it should enhance fatigue performance at intermediate temperatures (iii) it should strengthen the low temperature thermal cracking of the binder. Nanoclay is a nanoparticle of layered mineral silicates or can be called hydrous silicates. The scientists have explained that the effectiveness and the mechanical strength of the asphalt binder gets enhanced by using a small amount of clay content on a condition that the clay scatters into the binder at nanoscopic
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