Laboratory tests were performed on activated fillers, and the results showed that: 1. Activation reduces the true density of filler. 2. Activation reduces oil adsorption. 3. Activation reduces the porosity of filler. Test results showed the optimum amount of activating material to be 2%, a situation when the void volume is as low as possible, that is, the need for binder is minimum. The optimum binder contents determined with Marshall tests were 5.6% for ordinary binder, 5.2% for fatty acid used as activator, and 5.1% for fatty acid pitch. According to Marshall proportioning, the amount of binder needed for asphalt concrete mixture was reduced by 0 to 0.3%-units when activated filler was used. Splitting tensile strength tests showed that the mixture with activated filler was clearly more stable than the mixture with ordinary limestone filler. Wear tests showed that the test pieces which contained activated filler, wore on an average 34% less than the test pieces made of normal filler. (TRRL)


  • Finnish

Media Info

  • Pagination: p. 21-23
  • Serial:
    • Asfaltti
    • Issue Number: 44
    • ISSN: 0356-0120

Subject/Index Terms

Filing Info

  • Accession Number: 00492446
  • Record Type: Publication
  • Source Agency: VTT Technical Research Centre of Finland
  • Files: ITRD, TRIS
  • Created Date: Mar 31 1990 12:00AM