Road Surface Treatments

Road Surface Treatments - BRC uses or has used a number of different surface treatments, including:

  • Asphalt Overlays - Asphalt overlays are typically used in urban areas. 14mm overlays are used where heavy traffic is expected. 10mm overlays are used in less trafficked areas such as cul-de-sacs. (In response to stripping, oxidation or environmental cracking - not in the presence of condition 3 crocodile cracking.)
  • Slurry Seals are used in some urban areas as a low roughness, low noise alternative, but still relatively low cost alternative to sprayed seals.
  • Sprayed Seals are typically used in rural areas. 14mm, 10mm & 7mm seals are all used.
  • Primerseals are sometimes used to seal road shoulders
  • GATT Seals were used in the Childers area prior to the amalgamation as a cheap option for surfacing unsealed roads, but are no longer considered to be a preferred treatment.
  • Gravel Resheeting is used extensively to renew the unsealed road network. Resheets are typically 100mm to 150mm in depth.
  • Emulsion Seals are used to stabilise small areas on unsealed roads prone to scouring.

A number of the above treatments are unlikely to be used in the future, and there are a number of variations of the above treatments (e.g. various treatment depths) that can be used depending on the exact circumstance. The treatments below are the ones most likely to be used into the future.

  • Sprayed C170 Bituminous Reseal - Typically a 7mm, 10mm or 14mm Sprayed Seal on an existing sprayed seal. Generally used in Rural areas. Typically age used as driving factor and/or surface texture defects. When the segment has a high pavement defect or crocodile cracking defect presence. In situations where existing segment is Asphalt (in Urban areas commonly). Size of stone is determined on a project by project basis as the surface voids generally drives the size of the aggregate. Typically done in response to stripping, oxidation or environmental cracking, but not in the presence of condition 3 crocodile cracking
  • 30mm AC Overlay - Fine gap graded 7mm to 10mm nominal stone/mix. Typically use a C320 binder. Used generally in Urban areas only. Typically age (Ravelling) used as driving factor and/or local surface defects. This is a more expensive treatment and offers a smother surface for high and residental traffic and lowers noise in Urban areas and stops the sheer distresses from parked vehicles. When the segment has some but not high pavement defect or crocodile cracking defect presence. Also on Rural roads.
  • 50mm AC Overlay - Fine gap graded 14mm nominal stone/mix. Typically use a C320 binder. Used generally in Urban heavily trafficked areas only or where roundabouts are present or have a high percentage of turning volumes. Typically age (Ravelling) used as driving factor and/or local surface defects. Heavily trafficked areas i.e. Commercial and light vehicles or at intersections where severe distresses are present. Sprayed C170 Reseal with Heavy Patching Typically a 7mm, 10mm or 14mm Sprayed Seal on an existing sprayed seal, with prepatory patching. Generally used in Rural areas. Typically age used as driving factor and/or surface texture defects and also there are minor pavement or crocodile cracking defects present. When the segment has a high pavement defect or crocodile cracking defect presence. In situations where existing segment is Asphalt (in Urban areas commonly).
  • 30mm AC Overlay with Heavy Patching - Fine gap graded 7mm to 10mm nominal stone/mix. Typically use a C320 binder. Used generally in Urban areas only. Typically age (Ravelling) used as driving factor and/or local surface defects. This is a more expensive treatment and offers a smother surface for high and residential traffic and lowers noise in Urban areas and stops the sheer distresses from parked vehicles. Also there are minor pavement or crocodile cracking defects present. When the segment has high pavement defect or crocodile cracking defect presence. Also on Rural roads.
  • Slurry Seals - Typically apply a inexpensive surface treatment which comprises of bitumen and sand. To substitute for an asphalt or spray seal treatment, thereby improving the amenity and reduction of noise without the cost of an asphalt treatment. When the segment has some but not high pavement defect or crocodile cracking defect presence.
  • Slurry Seals with Major Patching - Typically apply a inexpensive surface treatment which comprises of bitumen and sand. To substitute for an asphalt or spray seal treatment, thereby improving the amenity and reduction of noise without the cost of an asphalt treatment. Pavement defects and crocodile defects are present. When the segment has some but not high pavement defect or crocodile cracking defect presence. Graded Aggregate Total Treatment (GATT) Apply this surface which is a mixture of a slurry / asphalt, has different size particles. To surface an unsealed road with a cheaper surface and little preparation. On existing sealed roads or on unsealed with poor pavement depth and shape.
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