S110074Attachments.pdf

AG-03R6-S-11-0074

Road Cleaning, Crack Resealing, Seal Coating & Road Re-striping

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ATTACHMENTS

The following attachments are a part of this solicitation and any resulting contract (see separate document(s)).

Wage Determination No. 2005-2317, Rev. 11, dated 06/13/2011, 9 pages

Specifications Section 418 – Asphalt Pavement Sealcoat, 3 pages

AFD Road Project Map, 1 page

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Wage Determination No. 2005-2317, Rev. 11, dated 06/13/2011

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Specifications

SECTION-418 Asphalt Pavement Sealcoat

Description

418.01 This work shall consist of the application of pavement sealing material(s) on existing pavement surfaces.

418.02 Conform to the following Subsections:

Emulsified asphalt 702.03 Water 725.01(c)

Construction Requirements

418.03 Composition of Seal Material

The primary component of seal materials shall be slow setting asphalt emulsion that conforms to either AASHTO M140 or M208. The Contractor shall submit a manufacturer’s certificate of compliance with each shipment of asphalt emulsion. Asphalt emulsions shall be mixed with additives that prevent bleeding. The Contractor may dilute seal materials with water to improve penetration into the pavement surface or for consistency improvement.

Additive Materials: Materials such as clays, slates, fibers, carbon black and polymers may be added to emulsified asphalt provided the manufacturer’s product literature is reviewed and approved by the Engineer prior to application. If the seal material is blended with sand, the sand shall be clean, hard, durable, un-coated particles, free from clay lumps and organic matter, with 100 percent passing the No. 16 mesh and a maximum of 5 percent passing the No. 200 mesh.

The sand must have a gradation that helps control segregation and promotes suspension during product application. No more than 3 pounds of sand shall be added to each gallon of applied material.

Top Dressing and Blotter Sand: Washed concrete sand meeting AASHTO M6 gradation requirements, unless otherwise approved.

Submit proposed emulsion mix for approval 14 days prior to production.

418.04 Equipment

The distribution equipment for all materials shall be capable of placing a uniform consistency of the material, and be capable of applying a uniform application over variable widths, grades and crowns of surface. Self propelled, asphalt distributor, squeegee or slurry seal spreader box, and hand-held spray and squeegee equipment or any combinations thereof may be required to obtain a satisfactory seal. The required application rate may also require multiple applications to obtain a satisfactory, uniformly, sealed surface. The equipment used for storing and application of

Aerial Fire Depot Attachments, Page 12 of 14 liquid and slurry products shall include accurate volume measuring devices and calibrated tank.

The Engineer may require transport or application equipment to be weighed when full and empty if volume measuring equipment is inadequate.

418.05 Surface Preparation

Clean the existing surface to be sealed of all loose material, dirt, dust, oil or any type of objectionable surface film that might jeopardize adhesion and a quality final product. Such accumulations may require removal by pressure washing, grinding, burning or scraping or a combination thereof. The surface will be approved in writing prior to applying the seal.

418.06 Weather Limitations

Apply the sealcoat when the air temperature in the shade and the surface temperature are at least 45o F and rising and when the weather is not foggy, rainy, or overcast. Do not apply when there is a danger of freezing within 24 hours.

418.07 Application

Ensure that the seal mix is of the desired consistency, with no signs of segregation as it leaves the mixer and distributor equipment and conforms to the approved job-mix. Application may be by hand-held spray equipment, asphalt distributor, squeegee or slurry seal spreader box. Seal material application shall be spread in two directions, 180 degrees from each other. The Engineer may require an additional application on small areas of pavement that have more surface voids, where voids have prevented adequate coverage or where uneven application exists.

The minimum `residue' application rate of 1.0 pound per square yard shall be obtained over the entire surface to be treated. Residue will consist of the asphalt cement portion of the emulsified asphalt and non-evaporative additive materials (such as clays, slates, fibers, polymers and sand) that are suspended in the emulsion when applied. Application rates may be adjusted up or down by 0.15 pounds residue per square yard by the CO to compensate for pavement surface absorption and roughness.

The volume of emulsion used shall be readily determined by the Contractor prior to, during and after application. Final payment will be based on meeting the specified application rate of residue. The CO will determine the weight of residue per gallon by drying field samples from the project to constant weight.

418.08 Maintenance and Opening to Traffic

Allow treated areas to completely cure before opening to traffic. Traffic control and the prevention of asphalt pickup under traffic is the Contractor's responsibility for 10 days following treatment. When directed by the CO, blotter sand shall be applied to the sealed pavement to prevent asphalt pickup by vehicles. The CO may require removal of loose blotter sand by brooming after the maintenance period. After the treatment has been open to traffic for 10 days, Aerial Fire Depot Attachments, Page 13 of 14 the Contractor shall repair any areas that are damaged by traffic, or areas that are peeling or cracking.

418.09 Sampling and Testing

Samples of the seal product as applied will be required for the project. Samples from stored containers may also be required at the CO’s discretion. Samples will be taken by the Contractor as directed by and delivered to the CO in approved plastic 1 gallon containers. A minimum of 3 samples per project will be required on all projects. Testing of the residual will be done by the CO. Results will be used in determining the actual residual seal rate applied. Additional quality testing of the emulsion may be done by the CO at his discretion to verify quality requirements.

418.10 Acceptance

As stated under 418.07 above, a minimum residual of 1.0 lbs / sy of product will be obtained on the sealed pavement surface. Sampling and testing and as outlined under 418.09 above will be used to determine “residual” and “quality” specification compliance.

Emulsified Asphalt/ the final seal product will be evaluated under Subsections 106.03 and 702.09.

Construction of the surfacing seal will be evaluated under Subsection 106.02 and 106.04.

418.11 Measurement

Measure the Section 418 items listed in the bid schedule according to Subsection 109.02 and the minimum “residual” specified above.

418.12 Payment

The accepted quantities will be paid for at the contract unit price for the pay items listed in the bid schedule, with the following exception:

If laboratory quality assurance tests on samples taken during application do not contain enough residue to meet the specified residue application rates established by the Engineer in Subsection 418.07, the CO may require the application of more material or may reduce payment. The following factors will be used to determine if the specified application rate has been obtained:

• The average unit weight of the field samples, determined by weighing 1000 milliliters to within + 0.1 gram.

• The percent residue per gallon on a by-weight basis.

• The total volume of product applied.

• The specified area.

AFD Road Project

Main Project Option #1