44 Fog Seal/Rejuvenator Rejuvenator ($-$$) A fog seal is a light application of a diluted, chemically-stabilized asphalt emulsion applied to the surface of aging asphalt pavements. Its primary purpose is to seal and enrich the surface, helping to extend the pavement’s life by addressing issues such as minor cracking, pitting and raveling, and reducing the permeability of the asphalt surface. Fog seals are particularly useful for combating surface distress, protecting the pavement from further damage and enhancing the appearance by darkening the surface. There are additional benefits of fog seals when applied after scrub seals and chip seals to help reduce the amount of “fly” rock by adding additional asphalt to help with chip embedment. Here’s an explanation of the benefits and characteristics of fog seals: 1. Surface Enrichment: Fog seals replenish the binder in the asphalt surface, which may have been lost due to oxidation and weathering. 2. Sealing Minor Cracks: While not a replacement for a proper crack-sealing program, fog seals can reduce the infiltration of water by sealing small, non‑working cracks. 3. Reducing Raveling: Fog seals can help bind the aggregate particles together, thereby reducing raveling, which is the dislodgement of aggregate from the pavement. 4. Reducing Permeability: By filling surface voids, fog seals can reduce water infiltration, which is a primary cause of pavement deterioration. 5. Enhancing Appearance: A fog seal application darkens the asphalt surface, which can improve the visibility of pavement markings and the overall look of the pavement. 6. Preventive Maintenance: As part of a preventive maintenance program, fog seals are cost-effective treatments for extending pavement life. 7. Surface Friction Consideration: After application, fog seals can temporarily reduce surface friction. Caution should be used when applying fog seals to high‑traffic areas. 8. Non-Trafficked Surface Application: Fog seals are recommended for non‑trafficked surfaces such as shoulders and areas around general aviation airports to enhance aggregate retention and minimize potential sources of Foreign Object Debris (FOD). It’s important to note that fog seals do not improve fuel resistance, and they should not be applied to pavements that lack surface permeability. They are not designed to soften the underlying asphalt but to act as a sacrificial layer to protect the underlying surface.
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