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Fog seal is a preventive maintenance procedure to stabilise the surface of existing oxidised asphalt surface which is on verge of developing ravelling (loss of fines from the matrix). Fog seal consists of applying diluted Slow Setting (SS) emulsion with a bitumen distributor. Application rate of fogRead more
Fog seal is a preventive maintenance procedure to stabilise the surface of existing oxidised asphalt surface which is on verge of developing ravelling (loss of fines from the matrix). Fog seal consists of applying diluted Slow Setting (SS) emulsion with a bitumen distributor.
Application rate of fog seal depends on the surface texture of the existing asphalt pavement so that the applied bitumen residue barely fills the interstices between exposed aggregate particles. Too much application would result in a slippery pavement which can cause accidents especially on high-speed roads.
Therefore, fog seal may have to be applied at lighter rates in 2–3 repetitive applications to ensure excessive bitumen binder is not used. In case of accidental application of excessive fog seal, sharp sand should be sprinkled and rolled on a hot day. That is why fog seals are generally safe for parking lots and streets with slow-speed traffic only.
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