title: Asphalt modified with nonmetals separated from pulverized waste printed circuit boards.
abstract: Nonmetals separated from pulverized waste printed circuit boards (PCBs) were reused as a new modifier to improve the performance of asphalt. The classical and rheological properties of unmodified asphalt and non-metal-modified asphalt (NMA) were determined. Specifically, the influence of nonmetals content and particle size on these properties has been studied. When the nonmetals content was 25 wt% and the particle size group was 0.07-0.09 mm, the NMA had a viscosity of 1225 cP at 135 degrees C, a penetration of 53.7 dmm at 15 degrees C, a ring and ball softening point of 54 degrees C, a ductility of 43.5 cm at 15 degrees C, a G*/sin delta of 3995.27 Pa at 60 degrees C, and an upper limit temperature (G*/sin delta = 1 kPa) of 69.4 degrees C, all of which showed that the high temperature performance of asphalt was improved significantly. Therefore, this study gives a fundamental understanding of NMA and represents a novel attempt to deal with the fast increasing quantities of nonmetals from waste PCBs, which is significant from an environmental and economic standpoint.
authors.affiliation: School of Environmental Science and Engineering, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People's Republic of China.
authors.forename: Jiuyong
authors.initials: J
authors.lastname: Guo
authors.forename: Jie
authors.initials: J
authors.lastname: Guo
authors.forename: Shifeng
authors.initials: S
authors.lastname: Wang
authors.forename: Zhenming
authors.initials: Z
authors.lastname: Xu
mesh_terms: D004581:Electronics; D006838:Hydrocarbons / Q000737:chemistry* / Q000302:isolation & purification*; D008670:Metals / Q000737:chemistry*; D010316:Particle Size; D012212:Rheology; D013696:Temperature; D014783:Viscosity; D014866:Waste Products
chemical_list: D006838:Hydrocarbons; D008670:Metals; D014866:Waste Products; C006647:asphalt