Development of a basecourse/sub-base design criterion
The Austroads pavement design guide is currently used in New Zealand for pavement design. It includes a design criterion for the subgrade limiting the subgrade strain value. In the last few years a significant number of early granular pavement failures on high-volume roads have occurred. Investigations into these failed pavements found that most of the surface rutting was from deformation of the granular layers with little or no visible contribution from the subgrade. Therefore, the Austroads design criterion for the subgrade is adequate in terms of providing enough pavement depth to protect the underlying subgrade soil but does not prevent failure in the granular layers. In a parallel research project on rut depth prediction for granular pavements a range of pavement lives was determined using models derived from repeated load triaxial (RLT) tests. These predictions were applied in this project to validate a simple method for obtaining a design strain criterion for basecourse and subbase aggregates from RLT tests and for use in CIRCLY to predict pavement life.
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/isbn/9780478371390
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Corporate Authors:
New Zealand Transport Agency
Private Bag 6995
Wellington 6141, New Zealand -
Authors:
- ARNOLD, G
- Werkmeister, S
- Morkel, C
- Publication Date: 2010-12
Language
- English
Media Info
- Pagination: 74p
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Serial:
- Issue Number: 429
Subject/Index Terms
- TRT Terms: Aggregates; Deformation; Durability; Pavement design; Pavement layers; Pavements; Tests
- Uncontrolled Terms: Subbase; Triaxial tests
- Geographic Terms: New Zealand
- ITRD Terms: 2990: Basecourse; 5566: Triaxial
- Subject Areas: Highways; Pavements; I22: Design of Pavements, Railways and Guideways;
Filing Info
- Accession Number: 01339144
- Record Type: Publication
- Source Agency: ARRB
- ISBN: 9780478371390
- Files: ITRD, ARRB, ATRI
- Created Date: May 9 2011 9:55AM