Chip Seal & Slurry Seal
Chip sealing places a thin layer of asphalt emulsion followed immediately by the application of rock chips over deteriorated pavement surfaces. Like slurry sealing, this treatment costs only a fraction of a conventional overlay, uses 90% less virgin rock, and lasts only half as long as traditional repaving. This treatment provides a coarser surface texture which increases tire traction, improving safety during winter driving conditions. Since the Streets Division snowplows do not need to apply as much anti-skid material, this technique also helps improve winter air quality.
Slurry sealing is the application of a 3/16" mixture of oil and rock to the pavement. While slurry sealed pavement typically lasts only about half as long as conventional asphalt overlay, the technique costs only about 15% as much. The Streets Division has reduced its need for virgin aggregates by nearly 90% for streets to which slurry seal is applied.