HMA Overlay

What it is

HMA OverlayHot Mix Asphalt (HMA) Overlay involves a composition of asphalt concrete and aggregate. It is used to treat poor pavement conditions when Slurry Seal, Microsurfacing, or Cape Seal treatments are not suitable. The overlay provides a restored surface which is smooth and can withstand heavy traffic. It is generally applied to arterial streets which have higher volume traffic. A pavement reinforcement fabric is applied before starting the HMA overlay process in order to prevent reflective cracking. Generally, this treatment can extend the life of a road by up to 20 years.

Process

  1. Pavement failure areas are dugout and repaired.
  2. Where needed, a leveling course is applied to the road in order to restore proper profile and cross-section.
  3. Streets are cleaned of vegetation or debris. 
  4. Wedge grinding and conform grinding are performed and streets are swept.
  5. Pavement reinforcement fabric is laid and HMA is applied and compacted with a roller.
  6. Days later, manholes and other utility valve covers are adjusted to final grade.
  7. 2 weeks later, permanent striping is replaced.

Impact to Residents 

Preparation activities may begin as early as 3-4 weeks in advance for repair of damaged pavement and crack sealing. Traffic delays can be expected during repair of pavement failure areas; however, roads are typically not closed. For the overlay process, roads will be closed for several hours until the material has cured enough to withstand traffic. Adjacent property owners will be notified via door hanger notices at least 72 hours before and “No Parking” signs with specified construction times will be placed on affected streets 48 hours before the process. Vehicles may not be parked on affected roads during the specified times; however, they may be parked outside of the construction zone if you plan to use them that day. Coordinate with construction workers to determine an estimate time of when construction will take place across your property if you need to utilize your driveway. Residents with special needs may contact the City in order to plan accordingly. All work is coordinated with transit and waste providers to minimize impacts to service.