The City Of Lewiston

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Quality Patching
Overview

"Quality patching" is used to repair larger damaged or fatigued areas of asphalt pavement. The damaged pavement section can include: multiple pot holes, "alligator" or "block" cracking, pavement raveling, pavement rutting, or pavement shoving. Quality patching is usually utilized to repair a road section larger than a single pothole.

A four-man crew usually performs quality patch repairs. Equipment frequently utilized to perform this function includes: backhoe, pavement cutter or pavement grinder, dump truck to haul excavated material and to haul materials used for the repair (base gravel and asphalt), a steel drum roller or plate compactor, and a utility truck and trailer to transport the roller and needed work zone traffic control devices.


Process
Quality patch repairs are accomplished by:
  • Square out and remove the area around pavement distress with either a pavement cutter or pavement grinder.
  • Remove old asphalt pavement and, in some instances, the base material.
  • If hot mix asphalt is to be used for the repair, a "tack coat" of liquid asphalt will be sprayed onto the bottom and edges of the excavated distressed area.
  • Asphalt mix will be placed into the excavated repair area to a depth that will be compacted level with the surrounding existing pavement surface.
  • The asphalt mix will be raked smooth.
  • The asphalt mix will then be compacted to an acceptable density with a plate compactor or small steel drum roller.

Because of the equipment needed for the repair, traffic control devices for work zone safety, in accordance with the Manual for Uniform Traffic Control Devices (MUTCD), must be in place before quality patch work is started. Traffic lane closures are almost always needed for quality patching. This, in turn, mandates traffic channelization or the establishment of detour routes. Flaggers may be needed in high traffic volume areas.

Pavement repair accomplished by this method will usually last longer than a "place and roll" patch. When conducted on hot mix roads with a majority of the road asphalt surface in good shape, quality patch repairs are generally preferable to place and roll patching.