High Performance Chip Seal (HPCS) and Double Chip Seal are preservation treatments the Township uses to help maintain the useful life a roadway. We attempt to get 20+ years of life out of the road overlay. In order to get that lifespan out of the roadway, we must seal the roadway (very similar to how property owners seal their driveway). The most often used preventative maintenance treatment is utilizing Chip Sealing.
Why use Chip Seals?
- Chip Seals eliminate the need to crack seal.
- Chip Seals enhance safety by providing good skid resistance.
- Chip Seals provide an effective moisture barrier for the underlying pavement against water intrusion by sealing cracks in the pavement.
- Chip Seals prevent deterioration of the asphalt surface from the effects of aging and oxidation due to water and sun.
- Chip Seals help eliminate black ice situations.
- In hot weather, Chip Seals re-seal cracks by flowing back together.
- Double Chip Seal is a two-layer Chip Seal where one is applied immediately after the other. Double Chip Seals are suited for roads which exhibit moderate to severe cracking, open textured roads where surface fines have been lost and on freshly leveled or scratched roads where the surface is too open and porous for a Single Chip Seal to be successful.
The methods of chip sealing are selected by the Township’s Engineer based on the overall condition of the roadway. Paving schedules are also determined by the Township Engineer based on conditions and the desire to evenly spread the yearly paving costs out.
The Townships’ contractor, in this case Martin’s Paving, will first apply a layer of emulsion mixture followed by the stones, which are different sizes depending on the treatment. The contractor will then return two weeks later to sweep up all loose stones and apply a fog seal. The fog seal is named fog due to the way it is applied from sprayers. It consists of a specially formulated asphalt emulsion that helps seal the roadway and gives it a nice black appearance. After Chip Sealing is completed expect the roadway to have some loose stone for the next few days/weeks. As more travel occurs, there will be less loose stone.
For more information, the 15-year roadway plan can be found (UAT Roadway Management Plan), which is reevaluated and updated annually.