The performance of New Zealand basecourse aggregates and glass aggregate mixtures found from repeated load triaxial testing

Repeated load triaxial (RLT) tests at many different combinations of confining stress and vertical cyclic stress for 50,000 loading cycles were conducted on a range of granular and glass aggregate mixtures. Results are analysed to predict the number heavy axle passes to achieve a rut depth limit that denotes failure. In the last 2 years at least 100 RLT tests have been conducted on TNZ M4 compliant and non compliant aggregates. This paper reports trends in results with observations on why some basecourse aggregates perform better than others. Different percentages of crushed glass and aggregate were also tested and results are reported. Results from RLT tests in some cases are surprising and early established theories of what makes a good basecourse do not always apply. Overall the repeated load triaxial test has proven ability to rank and predict the performance non traditional aggregates including waste and recycled materials. The introduction of the RLT test into Transit New Zealand specifications will allow more use of these non traditional materials in road construction. (a)

• Authors:
  • ARNOLD, G
  • ALABASTER, D
  • WERKMEISTER, S
  • ELLIS, J
  • ASHBY, R
  • LOWE, J
• Publication Date: 2008-6

Language

• English

Media Info

• Pagination: 18P
• Serial:
  • RECYCLING AND STABILISATION CONFERENCE, 2008, AUCKLAND, NEW ZEALAND
  • Publisher: NEW ZEALAND INSTITUTE OF HIGHWAY TECHNOLOGY (NZIHT)

Subject/Index Terms

• TRT Terms: Aggregates; Base course (Pavements); Building materials; Experimental roads; Glass; Pavements; Tests; Triaxial shear tests
• ITRD Terms: 4577: Aggregate; 2990: Basecourse; 2778: Experimental road; 4547: Glass; 4555: Material (constr); 2955: Pavement; 6255: Test; 5566: Triaxial
• Subject Areas: Highways; Pavements; I22: Design of Pavements, Railways and Guideways; I36: Aggregates;

Filing Info

• Accession Number: 01120907
• Record Type: Publication
• Source Agency: ARRB
• Files: ITRD, ATRI
• Created Date: Feb 5 2009 7:29AM