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Auckland Transport

Rodney dust supression trial Rodney dust supression trial

Auckland Transport (AT) is trialling 5 different pavement compositions along Old Woodcocks Road, Kaipara Flats, as part of our investigation into dust mitigation strategies for unsealed roads throughout the northern Auckland region.

The trial will begin in February 2017 and will last for as long as we can obtain useful information.


Project overview


AT is constructing 4 bound-and-sealed pavement surfaces and 1 unsealed surface on Old Woodcocks Road to investigate their effectiveness at reducing dust.

Through the trial, we aim to establish the local experience with different low-cost pavement types, identify how these pavements perform under uniform conditions, and establish whole-of-life costs of each pavement type.

Old Woodcocks Road has been selected as the trial site because the topography of the road is consistent and provides comparative sections of road to measure against.

Each trial section will be 300m long and clearly identified by both on-road markings and roadside signage.

Data will be collected from the trial sites including visual and physical dust monitoring, visual inspection of the pavement, cost and frequency of maintenance, and public feedback.

The results of the trial will be used to determine the suitability and best approach to introducing dust-suppressant solutions in the Auckland region.

Timeline

  • November 2016 - enabling work and construction of trial pavements.
  • February 2017 - trial starts.

Trial pavement types

See a detailed map of the trial sites (JPG 84KB)

1. Chip seal over strengthened pavement

Conventional chip seal surface is constructed over lime/cement stabilised overlay. This option consists of thickening the existing pavement, strengthening through stabilisation, and the application of a conventional chip seal surface.

Chip Seal Over Strengthened Pavement

See a cross-section of the pavement at site 1 (PDF 164KB)

2. Chip seal over existing pavement

Conventional chip seal surface to be constructed over existing pavement. This is the cheapest sealed option on trial.

Chip Seal Over Existing Pavement

See a cross-section of the pavement at site 2 (PDF 164KB)

3. Notta Seal over existing pavement

A variation of the Otta seal. Similar preparation and application technique, but using higher quality metal and standard bitumen emulsion.

Notta Seal Over Existing Pavement

See a cross-section of the pavement at site 3 (PDF 164KB)

4. Otta seal over existing pavement

Otta seals originated in the Otta Valley of Norway as a means of providing a quick, economical, medium-term solution for unsealed roads that often became impassable over winter. This method is now used extensively overseas as a low-cost method of dust suppression or network extension.

Otta Seal Over Existing Pavement

See a cross-section of the pavement at site 4 (PDF 164KB)

5. Conventional MAP40 unsealed road

Conventional unsealed road, however, it is constructed with lower standard, weathered ‘brown rock’, MAP40, which is softer and typically crushes as it compacts, forming a tightly-bound unsealed surface.

Unsealed Pavement

See a cross-section of the pavement at site 5 (PDF 164KB)

6. Control section: Original unsealed pavement

Consisting of granular overlay on clay subgrade.


Pros and cons of sealed and unsealed pavements

Sealed pavement composition

Pros

  • Low maintenance (life-cycle) cost.
  • Minimal maintenance required.
  • No dust nuisance.
  • Safer driving conditions.
  • Good ride quality.

Cons

  • High capital cost.
  • Longer construction period.
  • Increased speed environment.
  • Typically greater carriageway widths, hence increased impervious area and runoff.

Unsealed pavement composition

Pros

  • Low capital cost.
  • Reduced construction period.
  • Reduced speed environment.

Cons

  • High maintenance (life-cycle) cost.
  • Regular maintenance required.
  • Dust nuisance.
  • Increased safety issues.
  • Poorer ride quality.

Have your say


Give us your feedback on the different trial pavements and help us identify the best dust-suppressant solution for unsealed roads.

Have your say on the dust suppression trial

If you would like to print a feedback form to fill out, download the Dust suppression trial FreePost feedback form (PDF 580KB).


For more information

Contact Auckland Transport

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