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Description |
Indicative 20 Yr Design Life (ESAs) |
Approximate Thickness of Ganular Pavement Required as per AUSTROADS Pavement Design Guide |
Thickness of Granular Pavement Typically Found in the Field |
Thickness of Polyroad Stabilised Pavement |
| Newell Highway | high 107 to low 108 |
550mm on
CBR 5%, 425mm on CBR 8% |
300mm to 350mm | 150mm to
300mm, commonly 200mm |
| Sturt Highway | high 106
to low 107 |
500mm on CBR 5%, 375mm on CBR 8% |
130mm to 200mm | 150mm to 325mm, commonly 200mm |
| Riverina Highway (Finley to Deniliquin) | mid to high 106 |
450mm on CBR 5%, 350mm on CBR 8% |
150mm to 200mm | 200mm |
| Cobb Highway (Moama to Deniliquin) | mid to high 106 |
475mm on CBR 5%, 375mm on CBR 8% |
150mm to 200mm | 200mm |
| Mid Western Highway | mid 106 | 425mm on CBR 5%, 325mm on CBR 8% |
150mm to 200mm | 200mm |
| State Highway, Main Road 57 (Temora) | high 106
to low 107 |
500mm on CBR 5%, 375mm on CBR 8% |
150mm to 200mm | 200mm |
As can be clearly seen from the above Table, the typical depth of existing granular pavement is less than that required in AUSTROADS however, the depth of Polyroad stabilised pavement is considerably less again. Additional research and investigation is underway to provide a greater understanding of Polyroad's ongoing successful performance and provide pavement design guidelines as a supplement to recognised guidelines to structural design of pavements.
It should also be noted that many of the existing pavement materials (prior to stabilising/modifying) within the photographed locations do not have high elastic modulus values (vertical MPa). Whereas AUSTROADS Table 6.4 suggests a sub base gravel over granular material may have a presumptive modulus of 250 to 300 MPa, many of the sites have base materials (Prior Stream Gravels) of less than 200 MPa. This is typically the case for the Sturt Highway west of Narrandera, the Newell Highway south of Narrandera, the western half of the Riverina Highway, Cobb Highway and southern half of the Mid Western Highway within the southern portion of New South Wales.
When wetted up, the Prior Stream Gravels perform very poorly compared to common ridge gravels. When stabilised with Polyroad, pavements do not get wetted up therefore maintaining at least their inherent dry strength.
> State Highway SH20, Riverina
Highway - 22 Km West of Finley
> State Highway SH17, Newell
Highway - 27Km North of West Wyalong - Floodways
> State Highway SH17, Newell
Highway - 35Km North of West Wyalong
> State Highway SH17, Newell
Highway - 42Km North of Jerilderie
> State Highway SH14, Sturt Highway
- 60Km West of Wagga Wagga
> State Highway SH17, Newell
Highway - 75Km North of Jerilderie
> State Highway, Main Road 57 -
Temora Township
For more information Contact Us
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