The use of micro-surfacing for pavement preservation.
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The use of micro-surfacing for pavement preservation.

Filetype[PDF-637.35 KB]

  • English

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    • Abstract:
      The Maine Department of Transportation (MDOT) is responsible for maintaining approximately 14,000

      kilometers of public highways. Maintenance of these highways consists of rehabilitation or reconstruction

      when the road has deteriorated to an unacceptable level. With economic fluctuations and ever increasing

      traffic levels, this policy does not effectively address the needs of the highway system when maintenance

      is necessary and creates a backlog of deficient highways.

      To reduce this trend, many states have adopted the policy of Pavement Preservation. This policy consists

      of applying preventative maintenance to the roadway before it has deteriorated to an undesirable level,

      maintaining the structural integrity and extending the service life of the pavement. Length of time

      between costly rehabilitation is increased, reducing the cost of maintaining the highway system. Several

      states have reported that they were able to improve the overall condition of their highway system after

      trying this approach and that every dollar spent using preventative maintenance could save up to six

      dollars in future spending.

      Maine has two types of roads: “A” roads, which are built to state standards and “B” roads, which are not.

      Pavement Preventive Maintenance (PPM) can be used effectively on “A” roads to extend service life.

      Examples of PPM treatments include Crack Sealing, Thin Overlays, and Micro-Surfacing. Crack Sealing

      prevents water and debris from entering cracks in the pavement by sealing them with a rubberized

      material. Hot Maintenance Mulch is a hot mix asphalt pavement with little or no crushed aggregate and is

      typically used on “B” roads. Thin Overlays are dense - open graded Superpave mixes including recycled

      mixes that are typically used on “A” roads. Micro-Surfacing is a thin overlay of a mixture of polymer-modified asphalt emulsion, mineral aggregate, mineral filler, and water.

      This report will examine the application of Micro-Surfacing to extend the service life of two projects in

      Aroostook County.

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