Urban Asphalt

Asphalt, a relatively stable semi-solid paste of black petroleum used as paving material.
A slurry seal emulsion is often used in urban areas to coat, repair, or reseal existing asphalt paved roads, streets, driveways, and parking lots.
In all these settings, the asphalt or slurry emulsion is subject to weathering, oxidation, and the impacts of a constant barrage of petroleum related products from engine drippings, and various chemicals from coolants etc., plus air born roadway dust which can destabilize, or cause the petroleum components to recombine into other chemical groupings.
What is often set in motion is a process where the asphalt and sealants change back and forth between being a solid or a liquid, but with the surety that many of its toxic elements will migrate into the community.
News: USA Heat Wave June 2013: heat-absorbing road asphalt and concrete, can reach 200 degrees.

All photos (C) 2012 {D. T. Lange}

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