In order to withstand the effects of frost and road salts, concrete for various uses especially in road construction, is produced using air-entraining additives. It was established from tests on ready-mixed air-entrained concrete that large differences in air-content exist by the time the concrete is placed due to: minute differences in composition, moisture content of the aggregates and in mixing time and standing time in the truck-mixer. From comprehensive test programmes, the conditions at the mixing plant were investigated which affect the proportion (determined microscopically or in an air content apparatus) of total air content and artificially produced air content and in addition the changes in distance factor. The requirements of a ready-mixed concrete batching plant to deliver to site wholly uniform air-entrained concrete are listed. /TRRL/

  • Corporate Authors:

    Bauverlag GmbH

    Wittelbacherstrasse 10
    6200 Wiesbaden,   Germany 
  • Authors:
    • Kaltenboeck, H
  • Publication Date: 1975-6


  • German

Media Info

  • Features: Figures; References; Tables;
  • Pagination: p. 857-866
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00183481
  • Record Type: Publication
  • Source Agency: Bundesanstalt für Straßenwesen (BASt)
  • Files: ITRD, TRIS
  • Created Date: Dec 29 1978 12:00AM