Porous asphlat pavements are increasingly in demand because they offer site planners and public works officials the opportunity to manage stormwater in an environmentally friendly way.

Impervious surfaces such as roofs and pavements create runoff, so that dirt and debris are washed into streams and waterways. At the same time, water has often been regarded as the "enemy" of asphalt. Great efforts are taken to assure that water does not enter the roadway material, especially in areas with numerous freeze/thaw cycles.

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