ASSESSMENT OF CRUSHED ROCK ROAD BASE QUALITY BY SAMPLE PRETREATMENT AND WET/ DRY STRENGTH VARIATION

At present three procedures are specified by the Department of Main Roads, New South Wales to predict breakdown of crushed rock during construction: (a) repeated compaction (five cycles), (b) artificial weathering (ten cycles of wetting and drying), and (c) soaking in water at 65 degrees centigrade for ten days. In addition, the wet strength after 24 hours soaking, the dry strength and wet/dry strength variation are measured to determine material durability. This testing is based on the 10 per cent fines test procedure. The change in the plasticity index of the fines is specified as the measure of material change due to pretreatment. A maximum increase of 3 is allowed. This paper describes an investigation carried out to examine the effects of various methods of pretreatment. Analyses were also performed to determine the relationship between the various properties after pretreatment and wet strength, dry strength and strength variation. The repeated compaction procedure was found to have the most severe effect on road base samples and, for the materials tested, was considered to be the only method of pretreatment required. As there was a systematic change in properties with the number of cycles of compaction further testing was recommended before a change in the number of cycles is incorporated in a specification. Significant correlations were found between the strength parameters and some of the grading and plasticity parameters. (Author/TRRL)

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• Availability:
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• Corporate Authors:

  ARRB

  Melbourne, Victoria  Australia 
• Authors:
  • SMITH, R B
• Publication Date: 1984-12

Media Info

• Features: References; Tables;
• Pagination: p. 189-196
• Serial:
  • Australian Road Research
  • Volume: 14
  • Issue Number: 4
  • Publisher: ARRB
  • ISSN: 0005-0164

Subject/Index Terms

• TRT Terms: Aggregate gradation; Base course (Pavements); Compaction; Correlation analysis; Crushed rock; Dryness; Durability; Fines (Materials); Moisture content; Plasticity; Plasticity index; Quality control; Samples; Strength of materials; Surface treating; Tests; Water; Weathering
• Uncontrolled Terms: Dry conditions; Quality; Wet conditions
• Old TRIS Terms: Grading (By size)
• ITRD Terms: 3686: Compaction; 6527: Correlation (math, stat); 4173: Crushed stone; 5922: Plasticity; 3679: Pretreatment; 9063: Quality; 2961: Roadbase; 6251: Sample (mater); 5544: Strength (mater); 6255: Test; 4355: Water
• Subject Areas: Data and Information Technology; Geotechnology; Highways; I36: Aggregates;

Filing Info

• Accession Number: 00450796
• Record Type: Publication
• Source Agency: ARRB
• Files: ITRD, TRIS, ATRI
• Created Date: Aug 27 2004 9:56PM