This is a high performance thin (5/8”
to 3/4”) hot mix overlay that consists of a single-step
placement of spray applied polymer modified asphalt
emulsion immediately ahead of gap-graded hot mix
asphalt. The treatment provides a new paved wearing
surface that seals the existing pavement, preserves curb
reveal, and creates a high skid resistant surface that will
not de-laminate.
Overlays are a type of resurfacing finish that you apply over existing concrete
surfaces. They can revitalize the look of your concrete floor while also mimicking other types of stone, brick,
wood, and slate. An “overlay” creates a layer over the concrete.
The intent of this treatment is to leave the existing
pavement structure intact. Cast iron structures (manholes,
catch basins, water, and gas gates) will be reset to meet the
new pavement elevation (if required). A bonding agent
may be sprayed on the pavement and approximately 1.5
to 2 inches of new pavement will be installed. Minor pothole
patching and other pavement repairs are done prior to the
installation of this treatment. This treatment adds strength
to the road surface.
Whether a highway pavement is constructed using asphalt, concrete or a composite
system, traffic loads and environmental elements will contribute to its deterioration over time. Pavement
preservation treatments can slow this structural decline.
This treatment is intended for a roadway that has
outlived it useful life. It is considered to be the most
aggressive resurfacing treatment. The entire pavement
structure is completely pulverized to depth of 14" to 20".
Most of the pulverized material is reused as a subbase for
the asphalt paving. Additional material may be required
to be blended in the subbase to meet specifications. After
the subbase is installed a minimum of 4" of asphalt is
installed in multiple layers.
Routine maintenance, which comprises small-scale works conducted regularly, aims “to
ensure the daily passability and safety of existing roads in the short-run and to prevent premature
deterioration
of the roads” (PIARC 1994).
