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Note: Special seal coating project the week of August 5 (weather permitting):
The primary reason to seal coat an asphalt pavement is to protect the pavement from the deteriorating effects of sun and water. A seal coat combats this deterioration by providing a waterproof membrane which not only slows down the oxidation process, but also helps the pavement shed water, preventing it from entering the base.
The secondary benefit of seal coating is an increase in the surface friction it provides. This is accomplished by the additional texture the cover aggregate adds to the pavement.
Seal coats are affected greatly by weather conditions, especially during construction. The ideal conditions for applying a seal coat are a warm, sunny day with low humidity.
Steps in the process
First step: Application of a seal coat is to ensure the street is prepared by making minor repairs and thoroughly cleaning the surface.
Second step: Spraying asphalt cement on the surface of the existing pavement using an oil distributor.
Third step: Applying a cover aggregate using a chip spreader.
Fourth step: Rolling the cover aggregate into the asphalt cement as soon as possible.
Final step: Sweeping the street after 24 hours.