Atch_11_Spec_Section_32_12_13_Tack_ _Prime_Coat.doc

MAINTAIN/REPAIR PAVEMENTS IDIQ

IFB No.: F26600-99-R-C118

RKMF 98-0105

Contract No.:

PAVING IDIQ

Solicitation: FA4861-16-R-A300

SECTION 32 12 13

BITUMINOUS TACK AND PRIME COAT

1. PART 1 - GENERAL

1.1. APPLICABLE PUBLICATIONS: The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by basic designations only.

American Society of Testing and Materials (ASTM) Publications:

D 140-93 Sampling Bituminous Materials

D 977-91 Emulsified Asphalt

D 2995-93 Determining Application Rate of

Bituminous Distributors

1.2. PLANT, EQUIPMENT, MACHINES AND TOOLS:

1.2.1. General Requirements: All plant, equipment, machines and tools used in the work shall be subject to inspection, and shall be maintained in a satisfactory working condition at all times. The equipment shall be adequate and shall have the capability of producing the results specified.

1.2.2. Bituminous Distributor: The distributor shall have pneumatic tires of such size and number to prevent rutting, shoving or otherwise damaging the base surface or other layers in the pavement structure. The distributor shall be designed and equipped to spray the bituminous material in a uniform coverage at the specified temperature, at readily determined and controlled rates with an allowable variation from the specified rate of not more than plus or minus 5 percent, and at variable widths. Distributor equipment shall include a separate power unit for the bitumen pump, full-circulation spray bars, tachometer, pressure gauges, volume-measuring devices, adequate heaters for heating of materials to the proper application temperature, a thermometer for reading the temperature of tank contents, and a hand hose attachment suitable for applying bituminous material manually to areas inaccessible to the distributor. The distributor shall be equipped to circulate and agitate the bituminous material during the heating process.

1.2.3. Power Brooms and Power Blowers: Power brooms and power blowers shall be suitable for cleaning the surfaces to which the tack coat is to be applied.

1.3. WEATHER LIMITATIONS: Tack coat shall be applied only when the surface to receive the tack coat is dry. Tack coat shall be applied only when the atmospheric temperature in the shade is 50 degrees F or above and when the temperature has not been below 35 degrees F for the 12 hours prior to application.

1.4. SAMPLING AND TESTING:

1.4.1. General Requirements: Sampling and testing shall be performed by a testing laboratory.

1.4.2. Sampling: The samples of bituminous material, unless otherwise specified, shall be in accordance with ASTM D 140.

1.4.3. Initial Sampling and Testing:

1.4.3.1. Bituminous Materials: Certified copies of the manufacturer's test reports indicating compliance with applicable specified requirements shall be submitted to the Contracting Officer.

1.4.3.2. Calibration Test: The Contractor shall furnish all equipment, materials, and labor necessary to calibrate the bituminous distributor. Calibration shall be made with the approved job material and prior to applying the tack or prime coat material to the prepared surface. Calibration of the bituminous distributor shall be in accordance with ASTM D 2995.

1.4.3.3. Trial Applications: As a preliminary to providing the complete tack or prime coat, three lengths of at least 100 feet for the full width of the distributor bar shall be tacked to evaluate the amount of tack that can be satisfactorily applied. Unless otherwise authorized, the trial application rate of bituminous materials shall be applied in the amount of 0.05 gallons per square yard. Other trial applications shall be made using various amounts of material as may be deemed necessary.

2. PART 2 - PRODUCTS

2.1. BITUMINOUS MATERIAL: Emulsified asphalt shall conform to ASTM D 977, grade SS-1 or SS-1h.

3. PART 3 - EXECUTION

3.1. PREPARATION OF SURFACE: Immediately before applying the tack coat all loose material, dirt, clay, or other objectionable material shall be removed from the surface to be treated. The area to be tacked shall also be dry and clean.

3.2. APPLICATION RATE: Bituminous material for the tack coat shall be applied in quantities of not less than 0.05 gallon nor more than 0.15 gallon per square yard of pavement surface. Bituminous material for the prime coat shall be applied in quantities of not less than 0.15 gallon nor more than 0.40 gallon per square yard of pavement surface.

3.3. APPLICATION TEMPERATURE: Asphalt application temperature shall provide an application viscosity between 10 and 60 seconds, Saybolt Furol, or between 20 and 120 centistokes, kinematic.

3.4. APPLICATION: Following preparation and subsequent inspection of the surface, the tack or prime coat shall be applied at the specified rate with uniform distribution over the surface to be treated. All areas and spots missed by the distributor shall be properly treated with the hand spray. Following application of the tack material and prior to application of the succeeding layer of pavement, the tack shall be allowed to cure and obtain evaporation of any volatiles or moisture. Until the succeeding layer of pavement is placed, the tacked area shall be maintained by protecting the surface against damage and by repairing and retacking deficient areas at no additional cost to the Government. If required, clean dry sand shall be spread to effectively blot up any excess bituminous material. No smoking, fires, or flames other than the heaters that are a part of the equipment shall be permitted within 25 feet of heating, distributing, and transferring operations of bituminous material other than bituminous emulsions.

3.5. CURING PERIOD: Following application of the bituminous material and prior to application of the succeeding layer of pavement, the bituminous coat shall be allowed to cure and to obtain evaporation of any volatiles or moisture.

3.6. FIELD QUALITY CONTROL: Samples of the bituminous material shall be tested for compliance with the applicable specified requirements. A sample shall be obtained and tested by the contractor for every 200 gallons of bituminous material used.

END OF SECTION

Page 32 12 13-1 (22 Mar 99)

Bituminous Tack & Prime Coat

Page 32 12 13-3 (7 Feb 2016)