THE DEGRADATION OF BASE COURSE AGGREGATES--RESULTS FROM LABORATORY TESTS

NEDBRYTNINGSBENAGENHETEN HOS BAROLAGERGRUS--RESULTAT FRAN LABORATORIEFORSOK

Results from laboratory test methods were compared with the degradation that was found by sampling at road projects. Attempts were also made to study the degradation by construction traffic on a test track. In the laboratory tests, the base course aggregates were exposed to impact compaction, closely corresponding to AASHTO T 180, and wearing action in a planetary-type mixer. The tests were made at an approx. optimum water content. A too small quantity of fines are formed at the impact compaction tests compared to road conditions. In case of correspondance the fines are less plastic than in the road samples. Wearing action for 10 minutes in the mixer produced approx. as much fines as found in the road and also the plasticity of the fines corresponds better with the road samples. The degradation of coarse particles is small. The wet degradation test in a planetary-type mixer produces the most relevant results as the tendency to form fines is one of the most important quality criteria for base course aggregates. The test must be made primarily on certain problematical aggregates. For avoiding unnecessary testing, an aggregate classification is suggested and aggregate properties of the different classs are discussed. /Author/

Language

  • Swedish

Media Info

  • Features: Appendices; Figures; Photos; References; Tables;
  • Pagination: v.p.

Subject/Index Terms

Filing Info

  • Accession Number: 00188172
  • Record Type: Publication
  • Source Agency: Swedish National Road and Traffic Research Institute
  • Report/Paper Numbers: VTI Report 140
  • Files: TRIS
  • Created Date: Mar 28 1979 12:00AM