Pavement Management Treatment Types
Micro-surfacing is a mixture of rubber-modified emulsified asphalt, mineral aggregate, mineral filler, water, and additives that is mixed in specialized, compartmented, self-powered trucks and placed on the pavement using an augured screed box. Micro-surfacing is commonly used on arterial and collector roads, and is effective at correcting or inhibiting raveling and oxidation of the pavement surface, improving surface friction, sealing the pavement surface, and filling minor surface irregularities and wheel ruts up to 1.25 inches deep. Micro-surfacing typically lasts 5 to 7 years.
High Density Mineral Bond
High Density Mineral Bond is a surface seal consisting of a polymer modified asphalt emulsion and fine aggregate used almost exclusively for local roads. This treatment requires special equipment for application and per manufacturer’s specifications should only be placed on roads in relatively good condition. Roadway coverage with the product is guaranteed for 5 years.
Slurry Seal is a mixture of crushed, well graded aggregate (fine sand and mineral filler) and rubber-modified asphalt emulsion that is spread over the entire pavement with a spreader box attached to the back of a truck. Slurry seals are commonly used in neighborhoods and are effective in sealing low-severity surface cracks, waterproofing the pavement surface, and improving skid resistance at speeds below 30 MPH. Slurry seal typically lasts 5 to 7 years.
Fractured Aggregate Surface Treatment (FAST)
FAST is a treatment that includes the application of a rubberized emulsion covered with fine aggregate. FAST applications are typically performed on rural roadways where cracking is moderate to severe and provides structural assistance to the pavement. FAST applications typically last 5 to 7 years.
Low Volume Cape Seal
Low Volume Cape Seal is a multi- layer surface treatment utilizing the application of rubberized emulsion covered with a fine aggregate as the first layer followed by the application of a rubberized slurry seal. Low volume cape seals are utilized on local streets where the cracking is moderate to severe and provides structural assistance to thin layer pavements. Low volume cape seals typically last 5 to 7 years.
Layer 1 – FAST
Layer 2 – Slurry Seal
High Volume Cape Seal
High Volume Cape Seal is a multi- layer surface treatment utilizing the application of rubberized emulsion covered with a fine aggregate as the first layer followed by the application of a rubberized Micro Surface. High volume cape seals are utilized on arterial and collector streets where the cracking is moderate to severe and provides structural assistance to thin layer pavements. High volume cape seals typically last 5 to 7 years.
Layer 1 – FAST
Layer 2 – Micro-surfacing
Hot In-Place Recycling
A treatment that includes milling 1 to 1 ½ inches of the existing surface, heating the existing pavement, scarifying the existing pavement to a 1 inch depth, applying a recycling agent to the scarified material to restore viscosity of the aged pavement, mixing and laying the recycled material to form a leveling course, applying the virgin hot mix while the temperature of the recycled mix is still 225 degrees Fahrenheit, and then final compaction. Hot in place recycled roadways typically last 10 to 12 years.