ASR Modified Asphalt for Better Quality
DUTTA U and IBADAT I, University of Detroit Mercy, USA
When junk automobiles are shredded to recover the ferrous and non-ferrous metals for recycling, a large quantity of non-metallic residues is generated. This residue commonly called Automotive Shredder Residue (ASR) or "fluff', is typically disposed of in
When junk automobiles are shredded to recover the ferrous and non-ferrous metals for recycling, a large quantity of non-metallic residues is generated. This residue commonly called Automotive Shredder Residue (ASR) or "fluff', is typically disposed of in landfills. The ASR disposal cost affects the viability of the automobile shredder industry and, in turn, the supply and price of high quality scrap for the iron and steel industry. It is worth mentioning that the single largest source of recycled ferrous scrap for the iron and steel industries is junk automobiles. However, the cost of landfilling has increased tremendously over the past few years, possibly because of environmental regulations and a shortage of landfills. In addition, the volume of ASR per unit car has been growing. For example, in 1960, the average automobile weighted approximately 3800 lbs and contained less than 40 lbs of plastic. By 1980, the weight of the average automobile had decreased to about 3200 lbs, but included approximately 175 lb of plastic. By 2000, the average automobile is expected to weigh about 3000 lbs and contain 400 Ibs of plastic [Jody et al. 1991].
The composition of ASR varies among facilities, because of different types of source materials, models and years of junk automobiles, and separation processes. ASR generally contains a large variety of plastics and rubber components. The relative proportions of the principal types of non-metallic components in 1980 and 1990 automobiles are listed in Table I [Braslaw et al. 1991]. Elemental analysis of the shredded waste products are shown in Table 2 [Braslaw et al. 1991]. From Tables 1 and 2, it is evident that ASR mostly contains plastic and related materials.
Association for European Transport