Size-dependent enrichment of waste slag aggregate fragments abraded from asphalt concrete.

Academic Article

Abstract

  • Authors consider the environmental prospects of using melted waste slag as the aggregate for asphalt pavement. In particular, the enrichment of slag-derived fragments in fine abrasion dust particles originated from slag asphalt concrete and its size dependency were concerned. A series of surface abrasion tests for asphalt concrete specimens, containing only natural aggregates as reference or 30 wt% of substituted slag aggregates, were performed. Although two of three slag-asphalt concretes generated 1.5-3.0 times larger amount of abrasion dust than the reference asphalt concrete did, it could not be explained only by abrasion resistance of slag. The enrichment of slag-derived fragments in abrasion dust, estimated on the basis of the peak intensity of quartz and heavy metal concentrations, had size dependency for all slag-asphalt concretes. Slag-derived fragments were enriched in abrasion dust particles with diameters of 150-1000 μm. Enrichment factors were 1.4-2.1. In contrast, there was no enrichment in abrasion dust particles with diameter less than 75 μm. This suggests that prior airborne-size fragmentation of substituted slag aggregates does not need to be considered for tested slag aggregates when environmental risks of abrasion dust of slag-asphalt pavement are assessed.
  • Authors

  • Takahashi, Fumitake
  • Shimaoka, Takayuki
  • Gardner, Kevin
  • Kida, Akiko
  • Status

    Publication Date

  • October 30, 2011
  • Published In

    Keywords

  • Construction Materials
  • Hydrocarbons
  • Japan
  • Surface Properties
  • Digital Object Identifier (doi)

    Pubmed Id

  • 21868161
  • Start Page

  • 209
  • End Page

  • 215
  • Volume

  • 194