403PRIME COAT

403-1.01 DESCRIPTION. Construct an asphalt prime coat on an approved surface. Apply blotter

material, if required.

403-2.01 MATERIALS. Use materials that conform to the following:

Asphalt Section 702 (MC -30, CSS -1) Blotter Material Suitable clean sand CONSTRUCTI ON REQUIREMENTS

403-3.01 WEATHER LIM ITATIONS. Do not apply asphalt material to a wet surface, or when the

surface temperature is below 45 °F, or when weather conditions would prevent the proper penetration of the prime coat.

403-3.02 EQUIPMENT. A distribut or meeting Subsection 402- 3.02. An approved self -propelled

aggregate spreader and rotary paver broom.

403-3.03 PREPARATION OF SURFACE. Ensure that surface to be primed is shaped to the

required grade and section, free of ruts, corrugations, segregated mat erial or other irregularities, and uniformly compacted.

403-3.04 APPLICATION OF ASPHALT MATERIAL . Before prime coat application, obtain

approval of rate of application, temperature, and areas to be treated, from the Engineer. When CSS -1 Emulsified Asphalt is specified, dilute with an equal amount of potable water at a temperature between 50 and 120 ° F and mix for a minimum of 15 minutes before using. Apply asphalt material to the width of the section to be primed by means of a pressure distributor in a uni form, continuous spread. Do not exceed maximum application rate at overlaps. Squeegee excess asphalt material from the surface. Correct any skipped areas or deficiencies. Place building paper over the end of the previous applications and start the joining application on the building paper. Remove and dispose of used building paper. When road is open to traffic, treat not more than 1/2 of the width of the section in one application. Maintain traffic on the untreated portion of the roadbed. As soon as the asphalt material has been absorbed by the surface and will not pick up, traffic may be transferred to the treated portion and the remaining width of the section primed. Maintain the surface until the next course has been placed. Protect the surface against damage.

403-3.05 APPLICATION OF BLOTTER MATERIAL . If, after the application of the prime coat, the

asphalt material fails to penetrate and dry, and traffic must be routed over the primed surface, or rain is imminent, apply blotter material as directed. Do not apply blotter material sooner than 4 hours after application of the asphalt material.

403-4.01 METHOD OF M EASUREMENT. See Section 109. By calculated residual weight for

emulsified asphalt. 140 ALASKA 2020 403-5.01 BASIS OF PA YMENT. Water for emulsified asphalt and blotter material are subsidiary. Payment will be made under: PAY ITEM Item Number Item Description Unit 403.0001. ____ MC-30 Liquid Asphalt for Prime Coat TON 403.0002. ____ CSS-1 Emulsified Asphalt for Prime Coat TON 141 ALASKA 2020 SECTION 404 SEAL COAT

404-1.01 DES CRIPTION. Construct a seal coat on an approved surface, with or without cover

coat material, as specified.

404-2.01 MATERIALS. Use materials that conform to the following, for the type and grade

specified: Asphalt Section 702 Cover Coat Aggregate Subsection 703- 2.05 CONSTRUCTION REQUIREMENTS

404-3.01 WEATHER LIM ITATIONS. Do not apply asphalt material to a wet surface, or when the

surface temperature is below 60 °F, or when weather conditions would prevent the proper penetration and adhesion of the cover aggregate.

404-3.02 EQUIPMENT. Use the following equipment, or its approved equivalent:

404-3.03 PREPARATION OF SURFACE. Clean the roadway surface of all loose material

immediately before applying asphalt.

404-3.04 APPLYING AS PHALT MATERIAL. Apply asphalt material to an approved surface by

means of a pressure distributor in a uniform, continuous spread and within the temperature range specified. Apply asphalt material at the rate specified. If the surface texture is such that as phalt material penetrates the surface, a preliminary application of 0.05 to 0.10 gallon per square yard of surface may be required. Use building paper at the beginning of each spread. Remove and dispose of used building paper. Open the spray bar only when the distributor is moving forward at proper application speed. Correct any skipped areas or deficiencies. Do not exceed maximum application rate at overlaps. Suspend spreading asphalt material early enough in the day to permit the termination of traffic control prior to darkness. Apply asphalt material to only one designated traffic lane at a time. Cover the entire width of the lane in one operation. Spread the asphalt material not more than 6 inches wider than the width covered by the cover coat material. Do not allow asphalt material to chill, set up, or dry. Do not allow the distributor to drip on the surface of the traveled way.