02559 Prime Coat.doc

Pavements IDIQ

JCGU 09-1700

DIVISION 02 - SITE WORK

SECTION 02559 - BITUMINOUS PRIME COAT

PART 1 - GENERAL:

1.1 REFERENCES:

The publications listed below form a part of this specification to the extent referenced. The publications are referred to in the text by basic designation only. All publications shall be the latest revision in effect on the date of solicitation except where a date is given.

American Society for Testing and Materials (ASTM), Publications:

ASTM D 140

Sampling Bituminous Materials

ASTM D 490

Road Tar

ASTM D 633

Volume Correction Table for Road Tar

ASTM D 977

Emulsified Asphalt

ASTM D 1250

Petroleum Measurement Tables

ASTM D 2026

Cutback Asphalt (Slowing-Curing Type)

ASTM D 2027

Cutback Asphalt (Medium-Curing Type)

ASTM D 2028

Cutback Asphalt (Rapid-Curing Type)

ASTM D 2397

Cationic Emulsified Asphalt

ASTM D 2995

Determining Application Rate of Bituminous Distributors

Standard Specifications for Construction and Maintenance of Highways, Streets, and Bridges, Texas Department of Transportation, June 2004.

1.2 SUBMITTALS:

The following shall be submitted in accordance with Specification SECTION 01010:

Test Reports:

Sampling and testing shall be performed by an approved commercial testing laboratory or by facilities furnished by the Contractor. Copies of test results shall be furnished to the Contracting Officer within 24 hours of completion of tests.

Records:

Before the final statement is allowed, the Contractor shall file with the Contracting Officer certified waybills and certified delivery tickets for by the contract. The Contractor shall not remove bituminous material from storage until the initial outage and temperature measurements have been taken. The delivery or storage units shall not be released until the final outage has been taken.

1.3 PLANT, EQUIPMENT, MACHINES AND TOOLS:

1.3.1 General Requirements: All plant, equipment, machines and tools used in the work shall be subject to approval 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.

1.3.2 Bituminous Distributor: The distributor shall be mounted on pneumatic tires of such size and number to prevent rutting, shoving, or other wise damaging the base surface or other layers in the pavement structure. It shall be designed and equipped to spray the bituminous material in a uniform double or triple lap at the specific 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, 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.

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

1.3.4 Storage Tanks: Tanks shall be capable of heating the bituminous material, under effective and positive control at all times, to the required temperature. Heating shall be accomplished by steam coils, hot oil, or electricity. An armored thermometer shall be affixed to the tank so that the temperature of the bituminous material may be read at all times.

1.4 WEATHER LIMITATIONS:

The prime coat shall be applied only when the subgrade, subbase, or base course is dry enough to promote uniform coverage and the desired penetration into the treated surface. The prime coat shall be applied only when the atmospheric temperature in the shade is 50 degrees Fahrenheit or above and when the temperature has not been below 35 degrees Fahrenheit for the 12 hours prior to the application.

PART 2 - PRODUCTS:

2.1 BITUMINOUS MATERIALS:

Asphaltic material shall be cutback asphalt, Grade MC-30 or AE-P (asphalt emulsion), conforming to TXDOT Standard Specification Item 300, "Asphalts, Oils, and Emulsion," except that the measurement and payment paragraphs shall not apply.

PART 3 - EXECUTION:

3.1 PREPARATION OF SURFACE:

Immediately before applying the prime coat, all loose material, dirt, clay, or other objectionable material shall be removed from the surface to be treated. To assure a uniform spread of the bituminous material, the portion of the subgrade, subbase, or base course prepared for treatment, if excessively dry, shall be lightly sprinkled with water immediately before the application, as directed.

3.2 PRIME COATING:

3.2.1 Application Rate: Bituminous material for the prime coat shall be applied in quantities of not less than 0.15 gallon nor more than 0.35 gallon per square yard of pavement surface. The exact quantities within the range specified, which may be varied to suit field conditions, shall be determined by the Contracting Officer or his designated representative. Tack coat shall be applied where edges of hot-mix asphaltic concrete joins concrete surfaces.

3.2.2 Application Temperature: Emulsified asphalt and asphalt temperature shall be within the ranges found in TXDOT Standard Specification Item 300, "Asphalts, Oils, and Emulsion.

3.2.3 Application: Following preparation and subsequent inspection of the surface, the prime coat shall be applied at the specified rate with uniform distribution over the surface to be treated. To obtain uniform application of the prime coat on the surface to be treated at the junction of previous and subsequent applications, building paper shall be spread on the surface for a sufficient distance back from the end of each application so that the prime coat may be started and stopped on the paper. Immediately after application, the building paper shall be removed and destroyed. All areas and spots missed by the distributor shall be properly treated with the hand spray. Following application of the prime material, the surface shall be allowed to cure without being disturbed for a period of at least 48 hours or longer, as may be necessary to attain penetration into the treated course and evaporation of the volatiles from prime material. As directed, sand shall be spread to effectively blot up and cure any excess bituminous material. Until the succeeding layer of pavement is placed, the primed surface shall be maintained by protecting the surface against damage and by repairing and repriming deficient areas. No smoking, fire, or flames other than the heaters that are a part of equipment shall be permitted within 25 feet of heating, distributing, or transferring operation for bituminous materials other than emulsions.

3.3 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 100 gallons of bituminous material used.

3.4 SAMPLING AND TESTING:

3.4.1 General Requirements: No work requiring testing shall be permitted until the facilities have been inspected and approved. The first test shall be at the expense of the Government. Costs incurred for subsequent inspections shall be charged to the Contractor.

3.4.2 Sampling: The samples of bituminous material, unless otherwise specified, shall be taken in accordance with ASTM D140.

3.4.3 Initial Sampling and Testing

3.4.3.1 Bituminous Materials: Sources from which bituminous materials are to be obtained shall be selected and notification thereof furnished the Contracting Officer within 15 days after the award of the contract. Certified copies of the manufacturer's test reports indicating compliance with applicable specified requirements shall be submitted to the Contracting Officer not less than 15 days before the material is required in the work.

3.4.3.2 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 prime coat material to the prepared surface. Calibration of the bituminous distributor shall be in accordance with ASTM D2995.

3.4.3.3 Trial Applications: Per Task Order as requested on a AF Form 66. As a preliminary to providing the complete prime coat, three lengths of at least 100 feet for the full width of the distributor bar shall be primed to evaluate the amount of prime that can be satisfactorily applied. Unless otherwise authorized, the trial application rate of bituminous materials shall be applied in the amount of 0.25 gallon per square yard. Other trial applications shall be made using various amounts of material as may be deemed necessary.

3.4.4 Sampling and Testing During Construction: Quality control sampling and testing shall be performed as required in paragraph 3.3 - "Field Quality Control."

END OF SECTION

Section 02559 – Page 1 of 5