Section 411 — Asphalt Prime Coat

Description

411.01This work consists of applying an asphalt prime coat on a prepared surface.

Material

411.02Conform to the following Subsections: Blotter 703.12 Crushed aggregate 703.06 Emulsified asphalt 702.02 Water for construction 725.01(c)

Construction Requirements

411.03Equipment. Provide equipment conforming to Subsection 407.05.

411.04Surface Preparation. If applying an asphalt prime coat to an aggregate surface, prepare the surface to be primed according to Subsection 301.06. If required, use sweeping or other approved methods to remove loose dust and fine material and ligh tly spray the surface with water. Protect manholes, valve covers, curb and gutter, and other adjacent facilities from damage or overspray.

411.05Weather Limitations. Apply asphalt prime coat when the following apply:

(a)Surface is dry or slightly damp;

(b)Ambi ent air temperature is above 50 °F and rising;

(c)Surface temperature in the shade is above 50 °F and rising;

(d)Weather is not foggy; and

(e)Precipitation is not anticipated for at least 24 hours after completing the application.

411.06Asphalt Prime Coat Applicat ion. Apply asphalt prime coat according to Subsection 407.09. If no application method is designated, use Method 1.

(a)Method 1 – topical. Dampen the surface with water before applying asphalt prime coat. Apply undiluted emul sified asphalt formulated as a penetrating prime coat uniformly at a rate of 0.10 to 0.30 gallons per square yard. Obtain approval of the exact application rate. (b) Method 2 – inverted prime. Apply asphalt prime coat at a uniform rate of 0.20 to 0.30 gallons per square yard. Immediately apply crushed aggregate at a uniform rate of 20 to 25 pounds per square yard using an aggregate spreader. Obtain approval of the application rates for asphalt prime coat and aggregate. Do not allow the wheels of the aggregate spreader to come in contact with the emulsified asphalt. Immediately seat the aggregate using a roller. Operate rollers at a maximum speed of 5 miles per hour.

411.07Curing. Cure asphalt prime coat for at least 24 hours before allowing traffic or placing the covering course.

411.08Maintenance. Maintain the primed surface by keeping it free of corrugations, potholing, and loose material until placing the covering course. If damaged, repair damaged areas and reapply asphalt prime coat. Spread blotter to cover unabsorbed emulsified asphalt. Remove excess blotter after the emulsified asphalt is absorbed.

411.09Acceptance. See Table 411-1 for sampling, testing, and acceptance requirements. Crushed aggregate and blotter will be evaluated under Subsection 106.03. Emulsified asphalt will be evaluated under Subsections 106.02 and 106.03. Construction of the prime coat will be evaluated under Subsections 106.02 and 106.04.

Measurement

411.10Measure the Section 411 pay items listed in the bid schedule according to Subsection 109.02 and the following as applicable: When measuring prime coat by the square yard, measure the length along the centerline of the roadway. Include treated widened areas when measuring th e width.

Payment

411.11The accepted quantities will be paid at the contract price per unit of measurement for the Section 411 pay items listed in the bid schedule. Payment will be full compensation for the work prescribed in this Section. See Subsection 109.05 . Table 411-1 Sampling, Testing, and Acceptance Requirements

Material or

Product

(Subsection) Type of

Acceptance

(Subsection) Characteristic Category Test Methods

Specifications Sampling

Frequency Point of

Sampling Split

Sample Reporting

Time Remarks

Production

Emulsified

asphalt (702.02 ) Process control (153.03 ) Placement temperature − − 1 per distributor truck minimum Distributor truck No Before incorporating into work −

Prime coat

(411.06) Process control (153.03) Application rate & daily yield − − 1 per day minimum Contractor determined No End of shift −