DPW Construction Information

Explanation of Construction Terms

Roads:
Cold Planing - The removal of existing asphalt by milling.
Paving - Add new 1-½ inch layer of asphalt (bituminous) overlay.

The following is a list of treatments that will be used as part of the 2018-2019 accelerated pavement management program with a description of each.

Crack Seal

Crack sealing is the placement of a sealant material into cracks of an existing pavement surface to prevent excess water and moisture from penetrating the asphalt. This is a preventative measure to keep the road from deteriorating further. Crack Sealing can be done as a stand-alone treatment or in conjunction with other treatments listed below.

Fog Seal

A fog seal is a thin liquid layer applied to the surface of a paved road in relatively good condition. The intent of this treatment is to seal the pavement, rejuvenate, restore the wearing surface and provide resistance to deterioration due to the weather and sun. Subsequent to a Fog Seal the cracks are sealed with a liquid asphalt sealer. This treatment will extend the life of the pavement. This is classified as preventive maintenance.

Microsurfacing

A Microsurfacing is a thin layer (3/8") applied to an existing paved surface. Two layers can be applied also. This treatment adds a tough wearing coat to existing pavement. The intent of this treatment is to seal and protect the existing pavement as well as provide a new wearing course. Minor pothole patching and other pavement repairs are done prior to installation of this treatment.

Overlay

The intent of this treatment is to leave the existing pavement structure intact. All of the cast iron structures (manholes, catch basins water and gas gates) will be reset to meet the new pavement elevation. Minor pothole patching and other pavement repairs are done prior to installation of this treatment. This treatment adds strength to the road surface.

Mill and Overlay

The existing pavement has 1 to 2 inches of the surface ground off. This treatment removes the existing deteriorated wearing surface and leaves the substructure intact. The installation of new pavement follows the Overlay description above.

Cape Seal

A complete Cape seal application is done in several steps. After roads are leveled with a thin coat of asphalt (if necessary) a full width coating of chip seal material is applied. The chip seal has a surface that can be driven on for a short time and it is rougher than standard asphalt. It has some loose chips. About a week after chip seal, the roads will receive a microsurface coating. The finished microsurfaced road will be very similar to a standard paved surface. The "Cape seal" term describes the complete multi-layer treatment

Hot In-Place Recycling

Hot In-Place Asphalt Recycling is the process of rehabilitating deteriorated pavement. Existing asphalt is heated with two to three roadway heaters then scarified and mixed with a recycling agent. This new mix is then paved over the existing surface to correct surface distresses not caused by structural inadequacy. The new in-place product will then require a top course of microsurfacing or Hot Mix Asphalt.

Full Depth Reclamation

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.

Water Mains:
Cleaning and Lining - Clean interior of water pipe and line with cement, replace water services to property line.
Replacement - Replace water pipe with new pipe, and replace water services to property line.

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