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FULL DEPTH ASPHALT MILL PATCHING
Full depth asphalt mill patching is a high production process designed to achieve maximum efficiency in the removal and replacement of the entire cross section of asphalt pavement in the span of less than a day. This process is ideal when there are time constraints.
In certain circumstances where traffic flow requires continual access to properties, it is necessary to remove one traffic lane of failed pavement while the other traffic lane provides vehicle access to and from the site.
Full depth mill patching eliminates the need to jackhammer the pavement perimeter, excavate pavement by rudimentary means (backhoe or Grad-All), and disturb the soil´s subgrade.
A milling machine can quickly remove pavement to desired depth allowing the Pavement Network contractor to proof roll soil´s subgrade to ensure adequacy of compactibility of subgrade before replacement of repaired area with asphalt.
It´s fast, less disruptive, minimizes jackhammer noise, and provides you with a cost savings.
The byproduct, asphalt rubble that was disposed of at landfills, is now processed on site by a milling machine into particle sizes that allow asphalt, millings to be reused in hot mix pavement or can be used on your job site in areas where the soils subgrade is unstable and needs to be undercut. Just remove poor subgrade material, place Typar soil stabilization fabric before installing the asphalt millings, and compact. You´ll have a compacted subgrade using the waste materials from your old asphalt and you´ll save money.
The Process:
- Identify areas of pavement failure and mark out with spray paint at corners.
- Use a tracked asphalt milling machine to remove the entire thickness of asphalt pavement down to soil´s subgrade.
- Conveyor milling materials into waiting dump trucks and haul off site.
- Proof roll with weighted dump truck to confirm minimal deflection/movement of subgrade.
- Undercut and stabilize deficient areas with asphalt millings available from site repairs.
- Trim edges of patched areas and apply tack coat to sides of patches.
- Install a specific thickness of bituminous base and surface course hot asphalt mix.
- Use sufficiently heavy compaction equipment to obtain desired density of pavement repair. Make sure asphalt roller cross rolls each patch to ensure proper compaction.
- Apply a bead of sealant around the edge of each patch to help minimize water penetration.
- Keep patch free of traffic for 1 - 8 hours depending upon ambient temperatures.
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