02743.doc

SECTION 02743

PART 1

GENERAL

1.1

DESCRIPTION:

This item shall consist of preparing and treating a bituminous or concrete surface with bituminous material in accordance with these specifications and the project construction plans.

PART 2

PRODUCTS

2.1

BITUMINOUS MATERIALS:

The bituminous material shall be an emulsified asphalt, and shall conform to the requirements of Tables 1 and 2. The type, grade, controlling specification, and application temperature of bituminous material to be used shall be specified by the Contracting Officer.

TABLE 1. BITUMINOUS MATERIAL

Application Temperature

Type and Grade Specification Deg. F

Diluted Bituminous Material

SS‑1, SS‑1h

ASTM D 977

75‑130

CSS‑1, CSS‑1h

ASTM D 2397

75‑130

TABLE 2. MATERIAL REQUIREMENTS

ASTM D 977

Emulsified Asphalt

ASTM D 1250

Petroleum Measurement Tables

ASTM D 2397

Cationic Emulsified Asphalt

Asphalt Institute Temperature‑Volume Corrections for Emulsified

Manual MS‑6 Asphalts

Table IV‑3

PART 3

EXECUTION

3.1 weather Limitations:

The fog coat shall be applied only when the existing surface is dry and the atmospheric temperature is above 60o F. The temperature requirements may be waived, but only when so directed by the Contracting Officer.

3.2 Equipment:

1. The Contractor shall provide equipment for heating and applying the bituminous material.

2.

The distributor shall be designed, equipped, maintained, and operated so that bituminous material at even heat may be applied uniformly on variable widths of surface at the specified rate. The allowable variation from the specified rate shall not exceed 10 percent. Distributor equipment shall include a tachometer, pressure gages, volume‑measuring devices or a calibrated tank, and a thermometer for measuring temperatures of tank contents. The distributor shall be self‑powered and shall be equipped with a power unit for the pump and full circulation spray bars adjustable laterally and vertically.

3.

A power broom and/or blower shall be provided for any required cleaning of the surface to be treated.

3.3 Application of Bituminous Material:

1.

Immediately before applying the fog coat, the surface to be treated shall be swept with a power broom and/or airblast to remove all loose dirt and other objectionable material.

2.

Emulsified asphalt shall be diluted by the addition of water at the rate of one part emulsion to one part water.

3.

The bituminous material including water shall be uniformly applied with a bituminous distributor at the rate of 0.05 to 0.10 gallons per square yard depending on the condition of the existing surface. The application rate shall be approved by the Contracting Officer prior to application. During the application, surfaces of adjacent structures shall be protected to prevent them from being spattered or marred. In areas inaccessible to the distributor, application may be by the hand method.

4.

Following the application, the surface shall be allowed to cure without being disturbed for such period of time as may be necessary to permit drying out and setting of the fog coat. This period shall be determined by the Contracting Officer. Suitable precautions shall be taken by the Contractor to protect the surface against damage during this interval.

3.4 Bituminous Material ‑ Contractor's Responsibility:

1. Samples of the bituminous material that the Contractor proposes to use, together with a statement as to its source and character, must be submitted and approved before use of such material begins. The Contractor shall require the manufacturer or producer of the bituminous material to furnish material subject to this and all other pertinent requirements of the contract. Only satisfactory materials so demonstrated by service tests shall be acceptable.

2.

The Contractor shall furnish the vendor's certified test reports for each carload, or equivalent, of bituminous material shipped to the project. The report shall be delivered to the Contracting Officer before permission is granted for use of the material. The furnishing of the vendor's certified test report for the bituminous material shall not be interpreted as a basis for final acceptance. All such test reports shall be subject to verification by testing samples of material received for use on the project.

3.5 Freight and Weigh Bills:

Before the final estimate is allowed, the Contractor shall file with the Contracting Officer receipted bills when railroad shipments are made, and certified weigh bills when materials are received in any other manner, of the bituminous materials actually used in the construction covered by the contract. Copies of freight bills and weigh bills shall be furnished to the Contracting Officer during the progress of the work.

END OF SECTION

02743 -3 H:\8348\8348003.23\Docs\B-3 Specs\Division 2\02743.doc June 7, 2005