Paving and Asphalt

Use Resin-Bound Paving

What Is It?

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Resin-bound and -bonded paving uses a clear resin to bind gravel and other aggregates together. In resin-bound systems, the aggregate is mixed with the resin before application, while in resin-bonded systems, resin is applied to the surface and loose aggregates are scattered onto the surface before the resin sets. Plastic grids are occasionally used to reinforce the aggregate and increase load support (see our toolkit on plastic grids here). The aggregate layers are often quite thin compared to other types of paving, with no more than an inch of bound/bonded aggregates laid on top of a subgrade. It is usually considered a very visually-pleasing product, with a wide range of options for colors and patterns, as well as highly accessible to mobility impairment.

The porous nature of resin-bound/bonded paving gives it high permeability, subject to the permeability of the subgrade. As with other permeable pavements, periodic vacuuming will help maintain infiltration rates with frequency determined by the amount of sediment the system is exposed to. Without vacuuming, permeable systems typically become completely clogged within 5-7 years. Snow should only be removed using rubber or plastic shovels, as metal shovels and snow plows can damage the aggregate layers. Salt can also be used, but sand should be avoided. Please note that there are certain methods of applying resin-bound or -bonded paving that does not ensure permeability, so specify that perviousness is a high priority with your contractor or manufacturer.

Benefits

 

  • Enhances groundwater infiltration while reducing stormwater runoff volume, rate, and pollutants; reduces standing water, surface water runoff and flash flooding.
  • Aggregates can reduce urban heat island through increased reflectivity and evaporative cooling
  • Variety of colors and shapes of aggregate can achieve many desired aesthetics
  • Resin application prevents most aggregate displacement from heavy use
  • Reduces occurrence of black ice/freezing puddles in cold climates; requires less applied de-icers

 

 

Drawbacks

 

  • Lower load strength than other types of permeable paving
  • Damaged surfaces must be repaired by cutting out the affected section and re-laying the aggregate
  • Snow removal can be more difficult than with other types of paving
  • Pollutants can infiltrate groundwater—should not be installed in areas where hazardous material spills are possible
  • Frequent freeze-thaw cycles may require that expansion joints be cut into the paving

 

 

Regulatory Impacts and Requirements

Potential regulatory touchpoints in Boston and Massachusetts include:

  • Boston Groundwater Trust
  • Boston Water and Sewer Commission
  • Local Utilities
  • Boston Public Works Department
  • Public Improvement Commission
  • Zoning Board of Appeals
  • Architectural Access Board
  • MA Historical Commission/Boston Landmarks Commission

Financing Options, Incentives, and Rebates

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