THE DURABILITY MILL: A NEW PERFORMANCE RELATED DURABILITY TEST FOR BASECOURSE AGGREGATES

Investigation of a number of premature basecourse failures on roads throughout southern Africa has shown that in nearly every case the plasticity index and the fines of the basecourse material passing the 0.425 mm sieve (P245) exceeded the specification limits. Basecourse material degraded under traffic and in the presence of excess moisture. The durability mill (dm) test is outlined for use in specifications so that the degradation potential of a material may be assessed. The dm test has been based on the apparatus used for the Texas ball mill test. The test method involved the testing of four representative subsamples of about 3.5 kg each. Performance related results have shown that if the durability mill index (DMI) based on the product of the maximum plasticity index and the maximum p245 remains below 100, good performance can be expected under most conditions. If the DMI is greater than 150, the material has the potential to fail when wet. Good to fair performance can be expected for dmi's between 100 and 125, and fair to poor performance for materials with dmi's of 125 to 150. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/00097845
• Corporate Authors:

  South African Institution of Civil Engineers

  Gillstraat 18A, Observatory 2198
  Yeoville,   South Africa 
• Authors:
  • Sampson, L R
  • Netterberg, F
• Publication Date: 1989-9

Language

• Afrikaans

Media Info

• Pagination: v.p.
• Serial:
  • CIVIL ENGINEER IN SOUTH AFRICA
  • Volume: 31
  • Issue Number: 9
  • Publisher: South African Institution of Civil Engineers
  • ISSN: 0009-7845

Subject/Index Terms

• TRT Terms: Aggregates; Base course (Pavements); Bearing capacity; Deterioration; Failure; Moisture content; Pavements
• Geographic Terms: South Africa
• ITRD Terms: 4577: Aggregate; 2990: Basecourse; 3085: Bearing capacity; 5255: Deterioration; 5520: Failure; 5920: Moisture content; 2955: Pavement; 8103: South Africa; 5544: Strength (mater)
• Subject Areas: Geotechnology; Highways; Pavements;

Filing Info

• Accession Number: 00497676
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS, ATRI
• Created Date: Sep 30 1990 12:00AM