405TACK COAT

198

REQUIRED PROPERTIES FROM THE TESTING OF DISTILLATION RESIDUE FROM Pavon™ Parameter Test Method Value Penetration, 100 g, 5 secs. @ 77 F AASHTO T 49 60 mm Min. 130 mm Max. Ductility, cms., @ 39.2 F AASHTO T-51 40 cms Min. - Elastic Recovery @ 50 F, % AASHTO T-301 50 % Min. -

Crafco™ Pavement Joint Adhesive Part No. 34524 is a proprietary product that shall meet the requirements given in the following table: REQUIRED PROPERTIES FROM THE TESTING OF Crafco™ PAVEMENT JOINT ADHESIVE PART NO. 34524 Parameter Test Method Value Cone Penetration, 77 ºF ASTM D5329 60-100 Flow, 140 ºF ASTM D5329 5 mm-Maximum Resilience, 77 ºF ASTM D5329 30 %-Minimum Ductility, 77 ºF AASHTO T51 30 cm-Minimum Ductility, 39.2 ºF AASHTO T51 30 cm-Minimum Softening Point AASHTO T53 170 ºF Minimum

405.03Construction Requirements

In general, it shall be the Contractor's responsibility to select the proper size and amount of equipment to provide the desired results. Equipment furnished shall meet the requirements of Subarticle 401.03(a).

Grades CSS-1 and CSS-1h Emulsified Asphalts shall not be placed between the dates of October 1 and May 1 in North Alabama and between the dates of November 1 and April 1 in South Alabama regardless of weather conditions. For the purpose of identification, South Alabama shall be referred to for projects lying partly or wholly in the area of the State lying south of latitude 33 °N, with North Alabama encompassing the remaining portion of the State. These seasonal limitations shall not apply to the placement of other bituminous materials for tack allowed by Article 405.02.

Grade CSS-1 and CSS-1h Emulsified Asphalts shall not be used for tack during nighttime paving operations.

Tack material shall not be applied on a wet surface or when in the Engineer's opinion weather conditions are not suitable. NTSS-1HM may become slippery when wet.

When approved by the Engineer, grade CSS-1 and CSS-2 tack coats may be placed when the pavement temperature is 40°F and rising. Temperature limitations for the placement of all other tack coat materials shall be the same as specified in Subarticle 410.03(b) for the plant mix being placed. NTSS-1HM material shall not be used for cold applied asphalt pavement.

Loose material, dust, dirt, and all foreign matter shall be removed from the surface to be treated. All existing surfaces (new pavement, milled pavement, old pavement, or concrete) shall be clean and dry prior to the tack coat application. Cleaning operations can be achieved either through mechanical brooming, by flushing with water, vacuuming, blowing off debris using high-pressure air or other methods as determined by the contactor, unless otherwise shown on the plans. The existing surface shall be approved by the Engineer before application of the tack material. TACK COAT 199

Tack coat material application rates and temperatures shall meet the requirements given in the tables below: UNDILUTED APPLICATION RATE BY SURFACE TYPE, gal/yd² Tack Material New HMA or New Surface Treatment Existing HMA or Existing Surface Treatment Milled Surface PCC Emulsions 0.03 - 0.07 0.06 - 0.11 0.06 – 0.12 0.05 – 0.08 PG Asphalt Binder 0.02 – 0.05 0.04 - 0.07 0.04 – 0.09 0.03 – 0.05

TACK APPLICATION TEMPERATURES, °F Cationic Emulsified Asphalt 130 – 170 Anionic Emulsified Asphalt 150 – 180 Non-Ionic Emulsified Asphalt 150 – 180 PG Asphalt Binder 275 - 375 Tack coat shall be applied uniformly to the pavement surface to obtain full coverage. Tack coat applications that are streaky or striped in appearance will not be allowed and shall be reapplied. An asphalt distributor shall be provided for use on all accessible areas; inaccessible areas such as around manholes, etc. may be coated by other methods, approved by the Engineer. Tack coat shall be applied to all contact surfaces of curbs, gutters and manholes. Tack shall also be applied to the adjacent pavement edges (transverse and longitudinal) of all new base layers of Section 424 (Superpave), binder and wearing layers of Section 424 (Superpave) and Section 423 (Stone Matrix Asphalt), and to the joints in the surface layers between existing HMA pavement and new HMA pavement. This tack may be applied with the pavement surface tacking operation or in a separate pass. In either case, the surfaces, edges, and joints shall be thoroughly coated with tack. Adjacent surfaces, such as gutters and the like, that are not to be in contact with the mix shall be adequately protected from the spray by means of heavy paper securely fastened in place or by other satisfactory means. Any such surface soiled by tack coat material shall be cleaned and restored to its previous condition without additional compensation.

The following will apply if the Contractor uses Crafco™ or Pavon™ for application on adjacent pavement edges and joints. As a separate application from the tack coat, these products shall be applied by being sprayed or rolled on the face of the adjacent pavement edges and joints. These products shall be placed at the rates and temperatures given in the following table. APPLICATION RATES AND TEMPERATURES Product Application Rate Application Temperature Pavon™ 40 gallons per mile per inch of lift with a +/-10 % tolerance Ambient Temperature Crafco™ Pavement Joint Adhesive Part No. 34524 70 gallons per mile per inch of lift with a +/- 10 % tolerance 360 ºF – 400 ºF The Engineer will limit the length of product placement ahead of the asphalt spreader (usually no more than 1000 feet) to reduce the possibility of damage. The Engineer will also require the placement of Pavon™ far enough ahead of the asphalt spreader to allow the curing of the product. PLANING (MILLING) OF EXISTING PAVEMENT 200

Tack coat materials shall be fully cured before application of the overlying asphalt pavement layer is placed. Emulsified asphalt materials are considered as cured when the emulsion color has completely turned black. The NTSS-1HM asphalt emulsion shall be covered as soon as practical. Tack coat material shall be spread only far enough in advance to permit the construction to progress consistently, uniformly, and continuously after the curing period and shall not be applied so far in advance that the viscous quality will be reduced by traffic prior to construction thereon. Tack coat that loses its viscous quality before being covered shall be renewed and any which has been damaged shall be replaced without extra compensation.

405.04Method of Measurement

The amount of bituminous material used as directed for tack coat will be measured in gallons {liters}, as specified in Article 109.02. If Crafco or Pavon products are used, the Contractor shall provide a suitable means of measurement of the gallons of product used.

405.05Basis of Payment

The amount of bituminous material used as directed for tack coat, measured as noted above, will be paid for at the contract unit price bid per gallon {liter} which shall be full compensation for furnishing the bituminous material, hauling, heating, application, curing, and maintaining and for all equipment, tools, labor, and incidentals necessary to complete the work.

405-A Tack Coat - per gallon {liter} PLANING (MILLING) OF EXISTING PAVEMENT

408.01Description

This Section shall cover the work of removing existing asphalt pavement by either planing, micro- milling, or micro-fine milling.

408.02Equipment

The planing, micro-milling, and micro-fine milling machines shall be: • Self-propelled; • Of a size and shape that allows traffic to pass safely through areas adjacent to the work; • Equipped with automatic grade and cross slope controls; • Equipped with a means to prevent dust from escaping the milling operation; • Capable of maintaining the required depth of cut and cross slope; • Furnished with a lighting system for night work if night work is required or allowed by the engineer; • Provided with conveyors capable of removing the milled material and emptying it directly into trucks to be hauled away from the roadway. Micro-milling and micro-fine milling equipment shall be capable of removing pavement to an accuracy of 1/16 of an inch.

408.03Construction Requirements

The existing pavement shall be removed to varying depths in a manner which will restore the pavement surface to a uniform longitudinal profile and cross section as shown on the plans or as directed by the Engineer. The approximate depths of required removal are shown on the plans. The depth of removal shall be increased or decreased across the width of the pavement to obtain the required roadway cross-slope. The Contractor may make multiple cuts to achieve the required depth of cut. The pavement removal shall be done to effectively minimize the amount of airborne dust. Wetting of the pavement may be required to minimize the airborne dust. The Contractor shall provide a means of drainage to prevent water accumulation on the surface where the pavement has been removed.