In view of the fact that the aggregate constitutes 93-94% by weight of a bituminous road mixture, the quality of aggregate is of vital importance. The essential material properties are 1. Accuracy of grading (least possible variation), 2. Particle shape (elongated or flaky particles reduce fatigue life and make attainment of a uniform surface structure difficult), 3. Surface structure (smooth or rough), 4. Porosity (excessive porosity causes lean patches while too little porosity is bad for adhesion), 5. Density (variations must be avoided), 6. Colour (light colour is better for traffic safety), 7. Strength (critical with regard to wear resistance of the surfacing), 8. Thermal resistance (aggregate must withstand heat during mixing), 9. Moisture content (if this is high, costs of drying are excessive), 10. Adhesion to bitumen and asphalt (this can be enhanced by additives, but this increases the cost). /TRRL/

  • Corporate Authors:

    Svenska Vagforeningen

    Fridhemsgatan 15
    11240 Stockholm K,   Sweden 
  • Authors:
    • Christensen, I F
  • Publication Date: 1975


  • Swedish

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00129992
  • Record Type: Publication
  • Source Agency: Swedish National Road and Traffic Research Institute
  • Files: ITRD, TRIS
  • Created Date: Apr 7 1976 12:00AM