QUESTIONS OF TEMPERATURE ASSOCIATED WITH THE LAYING AND COMPACTION OF BITUMINOUS MIXTURES

TEMPERATURFRAGEN BEIM EINBAU UND VERDICHTEN VON ASPHALTMISCHGUT

Bituminous mixture does not reach its required strength until the compaction process. Because of the thermoplastic properties of the bitumen, the mortar of the mixture, which consists of bitumen and fine aggregates, acts as a lubricant, but can only do so at suitably high temperatures. The compactive effort therefore depends to a large extent on temperature. Whereas in the upper range of temperature high degrees of compaction can be obtained with little compactive effort, as the temperature drops the compactive effort becomes greater, and there is a risk that the required degree of compaction will not be attained. Thus the period of time available for compaction at given temperatures is of great importance. The extent of cooling, together with the influence of weather conditions, depends to a great extent on the layer thickness. Mixture laid thickly cools slowly enough for compaction to be achieved in the time available; thus problems of compaction only occur with layer thicknesses less than 3 cm. so that the rate of cooling is not increased, additional heat losses such as those caused by moisture movement have to be avoided. Too rapid cooling also impairs the bonding of the layers. Pneumatic-tyred rollers are recommended for compaction. /TRRL/

  • Corporate Authors:

    Verlagsgesellschaft Rudof Mueller

    Stolberger Strasse 84
    D-5000 Koeln-41,   Germany 
  • Authors:
    • Duebner, R
  • Publication Date: 1973-1

Language

  • German

Media Info

  • Features: Photos; References;
  • Pagination: p. 23-28
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00097363
  • Record Type: Publication
  • Source Agency: Research Association for Road Communications, W Gr
  • Files: ITRD, TRIS
  • Created Date: Oct 18 1975 12:00AM