407Prime Coat, Tack Coat, and

Prime Coat, Tack Coat, and Rejuvenating Agent

Description

407.01This work consists of preparing and treating an existing surface with asphalt material,

and blotter material if required, per these specifications and in conformity with the lines shown on the plans or established.

Materials

407.02Asphalt Material. The type and grade of asphalt material for prime and tack coating

will be specified in the Contract.

The asphalt material for all coatings shall meet the applicable requirements of Section 702. The asphalt material for prime and tack coating may be conditionally accepted at the source. The rejuvenating agent shall be accepted before loading into the distributor.

407.03Blotter Material. Blotter material for prime coating shall consist of aggregate base

course conforming to the requirements specified for base course aggregate on the project.

Blotter material for rejuvenating agent shall consist of dry, gritty sand conforming to the fine aggregate gradation of Table 703-2, or as approved.

Blotter material may be accepted in the stockpile at the source or at the roadway before placement.

Construction Requirements

407.04Weather Limitations. Prime coat and tack coat shall not be applied under the

following conditions:

407.05Equipment. The Contractor shall provide equipment for heating and uniformly

applying asphalt material and blotter material.

The distributor and equipment shall be capable of uniformly distributing asphalt material at even temperature and uniform pressure on variable widths of surface up to 15 feet at readily determined and controlled rates from 0.05 to 2.0 gallons per square yard. The allowable variation from any specified rate shall not exceed plus or minus 0.02 gallon per square yard. Distributor equipment shall include a tachometer, pressure gauges, accurate volume measuring devices or a calibrated tank, and a thermometer for measuring temperatures of tank contents. Distributors shall be equipped with a power unit for the pump and full circulation spray bars adjustable laterally and vertically.

The distributor for rejuvenating agent shall also be equipped with the following:

407.06

407.06Preparation of Surface. Preparation of the surface to be treated shall include all

work necessary to provide a smooth, dry, uniform surface. The work shall include patching, brooming, shaping to required grade and section, compaction, and removal of unstable corrugated areas.

The edges of existing pavements that are to be adjacent to new pavement shall be cleaned to permit the adhesion of asphalt materials.

407.07Application of Asphalt Material. Asphalt material shall be applied by a pressure

distributor in a uniform and continuous spread. When traffic is maintained, not more than ½ of the width of the section shall be treated in one application, or sufficient width shall be left to adequately handle traffic. Care shall be taken so the application of asphalt material at the junctions of spreads is not in excess of the specified quantity. Excess asphalt material shall be removed or distributed as directed.

Skipped areas or deficiencies shall be corrected. Asphalt material shall not be placed on any surface where traffic will travel on the freshly applied material.

The rate of application, temperatures, and areas to be treated shall be approved before application of the coating.

407.08Application of Blotter Material. If, after the application of the prime coat or

rejuvenating agent the asphalt material fails to penetrate and the roadway must be used by traffic, blotter material shall be spread in the quantity required to absorb excess asphalt material.

Method Of Measurement and Basis of Payment

407.09Asphalt material will be measured and paid for per Section 411

Blotter material will not be measured and paid for separately but shall be included in the work.

Payment for patching will be made at the contract unit price for the various items used for patching.

408.01