02570_0003.docx

A. General

1. Work under this Section includes the work necessary to seal coat the Upper Mississippi La Crosse Headquarter’s Parking Lot and the I-90 Parking Lot listed under the Base Bid Schedule.

2. All work performed under this Section shall be accomplished by mechanics experienced in this type of work and with equipment suitable for the type of work being done.

3. All work specified herein shall be accomplished only when in the opinion of the COR, weather and site conditions are suitable for this type of work.

4. Where not specifically covered herein, all work shall be accomplished in accordance with applicable provisions of Wisconsin Department of Transportation Standard Specifications for Highway and Structure Construction, 2021 edition(WI/DOT), Section 455, Asphaltic Materials.

5. Flagmen and barricades shall be used as necessary to control and direct traffic in a safe manner.

6. Submittals:

a. All materials utilized in the work shall be subject to review and approval by the COR prior to commencement work. Analysis of all seal coat materials proposed for use shall be submitted to the COR for review and approval prior to delivery of any such materials to the jobsite.

DIVISION 2 SECTION 02570

SITE WORK SEAL COAT SURFACING

c. At least 20 days prior to preparation of any seal coat material to be used on the project, the Contractor shall submit to the Engineer for review and approval, a rate of dilution and application rate to be used on the project. No material will be accepted for use until this submittal has been reviewed and approved, in writing, by the COR.

d. The COR reserves the right to make such changes in the dilution and application rates considered necessary within the limits of the specifications.

e. Testing: The emulsion shall be tested in accordance with ASTM D244. The contractor shall engage a qualified independent testing agency to perform quality control testing.

B. Materials

1. Seal Coat:

a. The emulsion used shall conform to ASTM D977 for SS- 1 or SS-1h, or to D2397 for CSS-1 or CSS-ih. The emulsion shall be slow setting type and diluted.

b. Water used for diluting shall be clean, potable water free from detectable solids or incompatible soluble salts.

C. Equipment

1. General:

a. The equipment used in the work shall be of sufficient size and in such mechanical condition as to meet the requirements specified herein and shall be capable of providing a satisfactory quality of work. The COR may order the immediate removal and replacement of any unsatisfactory piece of equipment which will not, in his opinion, produce finished work of acceptable quality.

b. Any equipment which drips fuel, grease, oil or any other substance which, in the opinion of the COR, is detrimental to the quality of the finished product shall not be permitted on the jobsite until such drips are adequately repaired.

c. Emulsion Distributor and/or Hand Sprayer: A properly calibrated emulsion distributor or hand sprayer shall be used for spraying emulsions. ASTM D2995 shall be used for distributor calibration. The distributor shall be free of any contaminants that can harm the emulsion. Recommended spray nozzle sizes are 1/8 to 3/16 inch.

d. Pump: A pump for continuous circulation of emulsion through the spray bar shall be provided. Pressure created within the distributator should be as low as possible. Heat applied to the tank or spray bar shall not exceed 185 degress F., which would boil the emulsion and plug the nozzles.

D. Execution

1. General:

a. Seal coat materials shall be applied only when surface and weather conditions are favorable and shall not be placed prior to a probable rain event.

b. Seal coat materials shall be placed only during daylight hours when the base and air temperatures are 50F or higher, when the relative humidity is 75% or less, and when the base surface is dry.

c. All bituminous pavement work shall be accomplished between June 1 through October 15.

d. The Contractor shall notify the COR at least 72 hours in advance of seal coat operations. All seal coating shall be conducted in the presence of the Government Inspector.

3. Surface Preparation:

a. Areas which are to receive seal coat shall be thoroughly cleaned with brushes, brooms, road sweeper, power brooms, high pressure washer, or compressed air to remove all dirt and debris from the road surface and cracks. The pavement shall be clean and dry before any sealcoating is performed.

b. All cracks in the Upper Mississippi Headquarter’s and I-90 Parking Lots will be cleaned and filled with crack filler material prior to seal coating.

4. Transportation of the Mix: It is recommended that dilution be performed at the time of application and not stored unless weather or other factor’s necessitates temporary storage.

5. Application: Emulsion shall be applied at a uniform rate without splattering or drilling from the spray bar using low pressure. Nozzle angle and spray bar height shall be adjusted to insure correct spray pattern.

6. Traffic Control:

When working, the Contractor shall provide appropriate barricades, warning devices, and/or flagmen as necessary to protect workers, equipment, and construction areas. Follow the Manual of Uniform Traffic Control Devices (MUTCD).

(END OF SECTION 02533)