Prime Time

This article describes the proper function and use of the prime coat in paving. Prime is not an adhesive, but rather serves to protect the base from rain and light traffic when paving will be delayed. Prime slows down the evaporation of the water applied for compaction and retards the penetration of rainwater. Sanding of prime is generally not necessary, and should only been done in areas that stay wet after the cure period. None of the nationally recognized asphalt pavement design systems give a structural value to a prime coat, and few of the commonly-used pavement specifications address the subject of prime coats at all. The need for priming is somewhat controversial, and approximately 15 years ago, the Florida Department of Transportation sought permission to eliminate prime as a requirement for rock bases. However, the Asphalt Contractors Association successfully defended the use of prime, arguing that if priming were made optional, the grading contractor would want the rock bases paved each time they had a small area ready, resulting in paving work being performed in much smaller sections and negatively impacting ride quality.

Language

  • English

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Filing Info

  • Accession Number: 01013338
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 1 2005 11:28PM