505.01 DESCRIPTION. An asphalt prime coat is used to seal newly
constructed unbound and/or un-stabilized base courses. Prepare and treat a surface with asphalt material in conformance with these specifications and in conformity with lines shown on the plans or established.
505.02 ASPHALT MATERIALS. Prime coat shall be cutback asphalt
Grade MC-30, MC-70, or AEP Emulsified Asphalt complying with Section 1002.
505.03 WEATHER LIMITATIONS. Do not apply MC-30 and MC-70
materials on a wet surface. Do not apply asphalt prime coat when ambient air temperature is less than 35°F in the shade.
505.04 EQUIPMENT. Provide the necessary equipment for proper
construction of the work. Apply with equipment conforming to 503.13.1. A hand-held pressure nozzle may be used for prime coat application in lieu of the spray bar/tachometer combination for irregular sections or short sections of 1500 feet or less.
505.05 SURFACE PREPARATION. Shape the surface to be coated to
required grade and section. Assure that the surface is free from ruts, corrugations, segregated material or other irregularities, and compact to required density. Delays in priming may necessitate reprocessing or reshaping to provide a smooth, compacted surface.
505.06 APPLICATION. Extend prime coat 6 inches beyond the width
of surfacing shown on the plans. Do not apply the prime coat until the surface has been satisfactorily prepared. Apply prime coat at the rates and temperatures shown in Table 505-1. Table 505-1 Prime Coats Asphalt Grade Application Rate Gal/Sq Yd Application Temperature F Min. Max. Min. Max MC-30 MC-70 AEP 0.25 0.25 0.25 0.30 0.30 0.30
505.07 PROTECTION. After prime coat has been applied, cure for a
minimum of 24 hours before placing the mixture. Keep traffic off the surface until the prime coat has properly cured, unless otherwise permitted by the engineer. If traffic is permitted, spread approved granular material, as directed by the engineer, over the prime coat at no direct pay. Maintain the prime coat intact. When required, thoroughly clean the primed surface prior to the placement of mixture. Where the prime coat has failed, clean the failed a rea and reapply prime coat to the unbound surface at no direct pay. When the prime coat is generally unsatisfactory, reapply prime coat to the unsatisfactory surface at no direct pay.
505.08 MEASUREMENT AND PAYMENT. Asphalt prime coat will
not be measured for payment; however, payment under the contract will be subject to the payment adjustment provisions of Section 1002 for specification deviations of the asphalt materials. The Materials and Testing Section will provide the payment adjustment percentage for asphalt materials. Payment for surface preparation will be made under other items.
Asphalt Prime Coat in other states
Get an email when 505 changes
Louisiana revises spec sections through supplementals and new editions. We check this one every week and email you the day it changes. Free, no account.