Construction Manual  

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  • 06 ASPHALT PAVEMENTS

  • SECTION 600 PRIME COAT

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    NOTE: The Department has developed and is continually updating a manual that addresses in detail most all asphalt related items, policies, procedures, reports, and other asphalt requirements. This manual is referred to as the HMA/QMS Asphalt Manual and is considered a part of the Specifications and this Construction Manual.
     
    600-1 DESCRIPTION
     
    Prime coat is a sprayed application of low-viscosity liquid asphalt to a base course of untreated material. It is the initial incorporation of asphalt onto the surface of soil or aggregate base course in preparation for the overlying pavement structure. The objectives of priming are:
     
    1. To waterproof the surface in order to prevent surface water from penetrating the base course or subgrade material.
       
    2. To plug voids to reduce the migration of moisture, coat, and bond loose mineral particles, and harden the surface being primed.
       
    3. To provide temporary cover in cases of delayed pavement construction or planned stage construction.
       
    4. To control dust.
       
    5. To promote adherence of overlying asphalt courses or surface treatment granular bases, including both ABC and soil type bases.
       
    6. To improve laydown and allow better compaction to be achieved on the first course of asphalt pavement placed.       
    Prime will be applied to the base beneath an asphalt plant-mixed pavement when required by the contract. Prime coat is generally specified when an asphalt surface layer is being placed directly onto an aggregate base course. ​If prime is not specified in the contract when a surface layer of pavement is to be placed directly on an unstabilized soil type base, consideration should be given to adding a prime coat. Prime required by the contract should not be eliminated without the specific approval of the State Construction Engineer or his representative.
     
    All non-asphalt bases beneath an asphalt surface treatment should be treated with a prime coat.
    600-2 MATERIALS
     
    A list of approved prime coat materials is maintained by the Materials & Tests Unit and may be obtained by searching for Prime Coat in the Product Category field at the following link.
     
    Prime coats are asphalt emulsions; however, they are significantly different from the asphalt emulsion tack coats discussed later in Section 605.​
    600-8 MAINTENANCE AND PROTECTION
     
    Excess prime not absorbed into the base after 24 hours should be absorbed with blotting sand and removed from the surface.
    ADDITIONAL RESOURCES
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