DEGRADATION OF BASE COURSE AGGREGATES IN LABORATORY MILL

NEDBRYTNING AV BAERLAGERGRUS I LABORATORIEKVARN

Numerous attempts have been made to measure the degradation of base course aggregates in laboratory conditions. Many of these have failed because of equipment inadequacies. This study used a laboratory ball grinding mill which has shown itself to produce test results very similar to the actual degradation in roads. In this investigation a quantity of shaly gravel from Jaemtland in Sweden was tested by rotating it for different periods of time together with steel balls and water. A 25% water ratio, 1 kg of steel balls and 30 mins grinding time were found to produce realistic results. These results were expressed as the absolute increase in the amount passing through each sieve with hole sizes between 0.074-4 mm. Further tests on twenty other materials of varying quality showed the results to be best expressed in terms of both the increase in proportion of fines (less than 0.074 mm) and maximum increase in grade in the interval 0.074-4 mm. After comparisons of different materials using these criteria three quality classes emerged. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/03476049
• Corporate Authors:

  Swedish National Road and Transport Research Institute (VTI)

  Linköping,   Sweden  SE-581 95
• Authors:
  • KARLSSON, B
  • Wichmann, C
• Publication Date: 1985

Language

• Swedish

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: 29 p.
• Serial:
  • VTI MEDDELANDE
  • Issue Number: 440
  • Publisher: Swedish National Road and Transport Research Institute (VTI)
  • ISSN: 0347-6049

Subject/Index Terms

• TRT Terms: Aggregates; Base course (Pavements); Gravel; Grinders; Laboratory studies; Quality control
• Uncontrolled Terms: Quality
• Old TRIS Terms: Ball mills; Degradation, aggregate; Grinding mills
• Subject Areas: Geotechnology; Highways;

Filing Info

• Accession Number: 00466191
• Record Type: Publication
• Source Agency: Swedish National Road and Transport Research Institute (VTI)
• Files: ITRD, TRIS
• Created Date: Mar 31 1988 12:00AM