In the summer of 1977 a Barber-Greene Drum Mixer Model DM-70 was evaluated by personnel from the Materials and Research Division of the Maine Department of Transportation. The study consisted of obtaining and testing samples of the stockpiles, mathematically combining these materials and then comparing the results with the actual product. Samples of the mixture were taken at various points in the process and the gradation, temperature, asphalt content, and water content were measured. Similar information obtained from previous studies performed on a drum mixer, an automatic batch plant, and a continuous flow plant were also used in this study. Comparisons between the several plants revealed that the automatic batch plant with good stockpiles produced the most uniform product. These results also revealed that the Barber-Greene drum mixer produced an acceptable product even though poor stockpiles were used and the bituminous controls on the drum mixer were not functioning properly. This study also revealed that the ideal location to sample the hot mix was at the drum discharge chute. At this point the least segregation occurred; however, the testing data indicated that the material deposited in the truck will be about 1 percent finer. /Author/

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 29 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00173902
  • Record Type: Publication
  • Report/Paper Numbers: Tech Paper 78-2
  • Created Date: May 31 1978 12:00AM