THE CAUSES OF FOAMING BITUMINOUS MIXTURES, DANGERS INVOLVED AND COUNTERMEASURES

URSACHE, GEFAHR UND GEGENMASSNAHME BEI SCHAEUMENDEM BITUMINOESEM MISCHGUT

The author discusses the influence of particle size distribution, the water saturation of the micro-pores, drying and mix temperature, the mixing time of the mineral material in the drying drum on the foaming up of rolled asphalt and gussasphalt mixes for road bases and binders. Such foaming is rare where the particle size is less than 8 mm, more frequent when the particle size is greater than 11 mm. Foam formation in a bituminous roadbase material can also arise because of a mixing temperature which is too low (120 - 140 deg C), in binder and other types of mixes when the temperature is too high (more than 160 deg C). Countermeasures recommended are: reduction in the mixing temperature to about 145 deg C or exchange of the particle fractions causing foaming or storage of the mineral material in hot silos. The reduction in mineral feeder in the drying drum and alteration of the time of treatment is not regarded as useful. /TRRL/

  • Availability:
  • Corporate Authors:

    Verlag fuer Publizataet

    Auf der heide 20
    300 Isernhagen HB, Hannover,   Germany 
  • Authors:
    • Schedler, D
  • Publication Date: 1976

Language

  • German

Media Info

  • Pagination: p. 41-42
  • Serial:
    • Strassen und Tiefhau
    • Volume: 30
    • Issue Number: 4
    • Publisher: Verlag fuer Publizataet
    • ISSN: 0039-2197

Subject/Index Terms

Filing Info

  • Accession Number: 00195163
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • Files: ITRD, TRIS
  • Created Date: Aug 15 1979 12:00AM