The final report of the cold mix asphalt development (AUT) project was published by the Norwegian Road Technology Department (NRRL) in 1998; the project began in 1994. Its main objectives were to develop functional, cost-effective wearing courses, and produce and lay cold mixes with the same durability as ordinary hot mixes, and with approximately the same roughness and driving comfort. The report describes the process from the planning of rehabilitation to production, laying, and rolling of cold mixes. A computer program has been developed to select priority road sections for repair, based on rutting and roughness data from the national road database. A complete system for designing cold mixes is presented. Laboratory methods show reasonably good agreement with the behaviour of the mixes during mixing, laying and rolling in the field. Three methods for analysing bitumen emulsion are discussed. The production of cold mixes is described, together with the testing of many mixing procedures. The best results were obtained using a paver with a heavy screed. No major differences in roughness (IRI) were found between cold mixes and normal wearing courses of typical hot mixes. Different rollers were tested for compacting cold asphalt. The costs of producing and laying cold and hot mixes were compared.


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  • Accession Number: 00768653
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Sep 10 1999 12:00AM