Concomitantly Controlling Harmful Fumes Generation and Enhancing Mechanical Properties of SBS Modified Asphalt by the Incorporation of MIL-101(Cr) as Modifier

Abstract

The metal organic framework [MIL-101(Cr)] was used as a second modifier to prepare MIL-101(Cr)-styrene-butadiene styrene (MIL-101(Cr)/SBS) modified asphalt. The influence of MIL-101(Cr) addition and contents on rheological properties and the amount and nature of fumes produced during higher temperature applications of modified asphalt were studied. Dynamic shear rheometer and multistress creep recovery tests revealed that MIL-101(Cr)/SBS modified asphalt exhibited better viscoelasticity, high temperature stability, and rutting resistance relative to pristine SBS modified asphalt. Compared with the pristine SBS modified asphalt, the storage modulus and loss modulus of 0.05% MIL-101(Cr)/SBS modified asphalt at 46°C increased by 100.9% and 88.1%, respectively. GC-MS analysis concluded that the addition of MIL-101(Cr) effectively reduced the generation of harmful fumes (from 26 to 3) in MIL-101(Cr)/SBS modified asphalt; thus, it can significantly reduce environmental pollution. Fluorescence microscopy analysis showed that MIL-101(Cr) was evenly distributed in SBS modified asphalt, whereas TGA tests revealed higher thermal stability of MIL-101(Cr)/SBS modified asphalt than SBS modified asphalt. This study, based on the incorporation of MIL-101(Cr) into SBS modified asphalt that leads to the effective control of harmful fumes production and enhanced thermal stability, could offer significant potential for designing alternative types of asphalt that enable highway and construction industries to adhere to road and environmental agencies standards.