33+ Prime Coat Asphalt Purpose PNG. Prime coat asphalt preparation is a vital element, as it directly affects the shear strength of the final asphalt product. It should be kept in mind that asphalt and water do not go well together, and pavement should always be designed to drain away any water which tends to come in contact with.
There are several purposes for the use of prime coat.
Prime and tack coats have a purpose in the pavement construction process, yet many times they are misused or eliminated during the project. Prime coats on granular base are necessary and should always be used. Depending on the purpose, seal coats may or may not be covered with aggregate. You should sealcoat your asphalt as soon as it begins to turn grey or 90 days after installation.