SECTION 408: PRIME COAT
408.1 Description
This Work consists of provid ing and applying asphalt Material a nd blotter Material (if required) to an existing surface.
408.2 Materials
The Contractor shall provide one (1) of the following types of prime coat asphalt Material: 1. Asphalt emulsified prime (AE-P); 2. Penetrating emulsified prime (PE-P); 3. Emulsified Petroleum Resin Prime (EPR-1) 4. MC-70; or 5. Other Material approved by the Project Manager. The Contractor shall provide pr ime coat asphalt Material in acc ordance with Section 402, “Asphalt Materials and Mineral Admixtures.”
408.2.1 Certification
The Contractor shall provide a manufacturer’s written certifica tion that the prime Material is chemically identical to thos e identified on the Department’s Approved Products List .
408.2.2 Blotter Material
The Contractor shall provide fine aggregate (sand) blotter Mate rial in accordance with Table 408.2.2:1, “Blotter Material,” unless otherwise approved by the Project Manager. Table 408.2.2:1 Blotter Material Sieve size % passing 3/8 inch 100 No. 4 80 – 100 No. 16 45 – 80 No. 50 10 – 30 No. 100 2 – 10
408.3 Construction Requirements
The Project Manager will determine the prime coat application r ate and as indicated in
408.3.1 Temperature and Weather Limitations
The Contractor shall not apply the prime Material in the follow ing conditions: 1. If the surface has standing water; 2. If the air temperature is less than manufacturer’s recommend ation; or 3. If weather conditions prevent the proper placement of the pr ime coat. Section 408: Prime Coat Page 176 The Project Manager may waive these temperature and weather lim itations due to wet weather conditions or to protect W ork in progress during Depart ment approved suspensions.
408.3.2 Equipment
The Contractor shall: 1. Provide a distributor and E quipment for heating bituminous M aterial. Ensure the distributor is capable of maintai ning the prime Material at an even temperature and can uniformly distribute the Mate rial on variable widths with u niform pressure; 2. Ensure that the distributor can apply the Material as requir ed; 3. Ensure that the distributor circulates the prime Material wi thin the tank, the spray bar, and other accessories when not spraying; and 4. Ensure that the distributor has a hand spray gun with a prec ise-control single or double nozzle and a positive shut-off valve. The Contractor shall ensure that the distributor has the follow ing Equipment: 1. A tachometer; 2. Pressure gauges; 3. Accurate volume-measuring devices or a calibrated tank; 4. A thermometer that measures the temperature of tank contents ; 5. A power unit for the pump; and 6. Laterally and vertically adjustable spray bars.
408.3.3 Preparation of Surface
The Contractor shall: 1. Shape the surface to be primed in accordance with the Plans, and ensure that it is free of ruts, corrugations, segr egated Materials, or other irre gularities. 2. Uniformly compact the surfac e in accordance with Section 303 , “Base Course.” 3. Ensure that the surface is s lightly moist but not saturated when applying the prime.
408.3.4 Application of Prime Material
The Contractor shall: 1. Not apply the prime coat until the Project Manager has appro ved the quantities, application rates, Material temperature, and locations; 2. The Contractor shall apply the prime Material in a uniform a nd continuous layer using a pressure distributor; 3. Ensure the nozzles on the pressure distributor are fully ope n and at the same angle from the spray bar, approximately 30°; 4. Keep the spray bar at a height above the pavement surface to provide a double or triple lap of the prime Material; 5. If using a hand-held want, ensure the application is uniform ; and 6. If distribution irregularitie s occur, cease operations and t ake corrective action. If the Department allows traffic on the surface, the Contractor shall maintain one (1)-way traffic on the untreated section of the Roadbed until the treat ed surface has absorbed the prime Material, then transfer traffic to the treated portion an d prime the untreated section. The Contractor shall perform Work and procedures in accordance with manufacturer’s recommendations.
408.3.5 Application of Blotter Material
If the prime Material fails to penetrate the surface within 24 h after its application, the Contractor shall spread blotter Material to absorb the excess M aterial. The Project Manager may approve the use of blotter Material on Roadway sections tha t must be opened to traffic before the 24 h waiting period.
408.4 Method of Measurement
The Department will consider any water added to further dilute emulsified asphalts Incidental to Asphalt Material for Prime Coat and no separate payment will be made.
408.5 Basis of Payment
Pay Item Pay Unit Prime Coat Material T o n
408.5.1 Work Included in Payment
The Department will consider as included in the payment for th e pay item(s) listed in this section and will not measure or pay separately for the followin g Work: 1. Providing, mixing, heating , and applying asphalt Materials t o the roadbed with an asphalt distributor; 2. Provide blotter Material as required; 3. Shipping/Delivery to Project site; 4. Sampling and Testing; and 5. Water. Section 411: Hot-Poured Crack Sealant Page 178