403.07 Basis of Payment.
furnished by the Contractor. The weight of the dry aggregate, asphalt emulsion, and the cement used in the mixture shall be calculated and included in the total weight measured for payment. Additional materials such as mineral fillers, water, and chemical additives shall be included in the contract price for micro -surfacing seal coat and will not be measured separately for payment. Deductions in measurement will be made for all material wasted or lost or applied beyond the limits of the work.
403.07 Basis of Payment.
a.Unit Price Coverage. Compensation for the Micro -Surfacing material, measured as provided above, will be made on a tonnage basis and the contract unit price per ton shall be full compensation for construction of the Micro -Surfacing complete in place as shown on the plans or directed. This price shall include all materials, procurement, handling, hauling, and processing and includes all equipment, tools, labor, and incidentals required to complete the work, with the following exception: Tonnage placed in excess of the amount shown on the plans or directed in writing, plus two pounds per square yard, will be paid for at eighty percent of the contract unit price bid. No payment will be made for unacceptable material; for material furnished or used in excess of the amount indicated or directed, except as provided above; for material used in replacing defective or condemned work; for mater ial wasted in handling, hauling, or otherwise; or for maintaining the work.
b.Payment will be made under Item No.: 403-B Micro -Surfacing Seal Coat, Type * - per ton * Specify Type “II” or “III”. TACK COAT
405.01 Description.
The work under this Section shall cover the furnishing and placing of a bituminous tack coat on a surface which is to be covered by a bituminous plant mix material in accordance with these specifications and in reasonably close conformity with the lines shown on the plans or directed by the Engineer. The work shall include cleaning the surface prior to application of the tack coat. The area of treatment and the rate of application of a tack coat shall be based on the plans and specifications after evaluating the actual surface condition on which the plant mix overlay is to be placed.
405.02 Materials.
a.Tack Coat Bituminous material for tack coat shall be Emulsified Asphalt or one of the Performance Graded (PG) Asphalt Binders shown in Article 804.07. Emulsified Asphalt s shall not be diluted prior to application. The Contractor shall have the option of using the following materials for the tack coat: • PG 58 -22 performance graded asphalt binder • PG 64 -22 performance graded asphalt binder • PG 67 -22 performance graded asphalt binder • PG 76 -22 performance graded asphalt binder • CRS-1H emulsified asphalt • CRS-2 emulsified a sphalt • CRS-2H emulsified asphalt • CMS-1HP emulsified asphalt • CSS-1 emulsified asphalt • CSS-1H emulsified asphalt • CQS-1H emulsified asphalt • CQS-1HP emulsified asphalt • CRS-2P emulsified asphalt • CRS-2L emulsified asphalt
405.02 Materials.
• CBC-1HT emulsified asphalt • CNTT -1HS e mulsified asphalt • BC-1HT emulsified asphalt (anionic) • NTSS-1HM emulsified asphalt (anionic) • NTQS -1HL emulsified asphalt (non -ionic) In lieu of tack coat, materials listed in Subarticle 405.02(b) may be applied to adjacent pavement edges and joints as desc ribed in Item 2 of Subarticle 405.03(d). Unless shown otherwise on the plans, the contractor shall have the option of using any of the allowable bituminous materials, subject to other limitations of these specifications. In making the selection of material s, the Contractor shall take into consideration seasonal, weather, temperature, and other placement conditions, while keeping in mind that SS stands for slow setting, RS stands for rapid setting, and QS stands for quick setting (QS is the faster setting or breaking emulsion). Low temperatures and humid or damp conditions will retard the breaking or setting of all emulsions. The mixing of a cationic and an anionic emulsion will result in failure of emulsion materials. All materials shall meet the requiremen ts of Section 804. CQS-1HP shall be a cationic emulsion blended with a minimum of 1.2% polymer meeting the requirements given in Article 811.03 and the requirements given in the following table: CQS-1HP MODIFIED ASPHALT EMULSION TEST OF EMULSION Parameter Test Method Value Residue % By Distillation ALDOT 415 60 % Min. - Viscosity, SF @ 77 °F, sec. AASHTO T 59 20 SF Min. 100 SF Max. Sieve Test, % AASHTO T 59 - 0.1 % Max. Particle Charge AASHTO T 59 Positive TEST OF RESIDUE FROM EMULSION 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. -
b.Additional Materials for Application on Adjacent Pavement Edges and Joints . The Contractor may use the following materials in lieu of tack coat for application on adjacent pavement edges and joints. • Pavon™; • Crafco™ Pavement Joint Adhesive Part No. 34524. Pavon™ is a proprietary product that shall also meet the requirements given in the following tables. REQUIRED PROPERTIES FROM THE TESTING OF Pavon™ Parameter Test Method Value Residue % By Distillation ALDOT 415 60 % Min. - Viscosity, SF @ 77 °F, sec. AASHTO T 59 20 SF Min. 100 SF Max. Sieve Test, % AASHTO T 59 - 0.1 % Max. Particle Charge AASHTO T 59 Positive 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. -
405.03 Construction Requirements.
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
405.03 Construction Requirements.
a.Equipment . 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).
b.Seasonal, Nighttime, Weather, a nd Temperature Limitations .
1.Seasonal Limitations for the Placement of Tack. 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 Sout h 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 port ion of the State. These seasonal limitations shall not apply to the placement of other bituminous materials for tack allowed by Article 405.02. The tack may be placed if allowed by the Engineer when the pavement temperature is 40°F and rising.
2.Nighttime Limitations for the Placement of Tack. Grade CSS -1 and CSS -1h Emulsified Asphalts shall not be used for tack during nighttime paving operations.
3.Weather Limitations for the Placement of Tack. 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.
4.Temperature Limitations for the Placement of Tack. Temperature limitations for the placement of tack coat material shall be the same as specified in Subarticle 410.03(b) for plant mixed pavements. NTSS -1HM material shall not be used for cold applied asphalt pavement.
c.Preparation of Surface . 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 d ebris 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.
405.03 Construction Requirements.
d.Application .
1.General. Tack coat mater ial 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 Aspha lt), 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 thorough ly 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 su rface soiled by tack coat material shall be cleaned and restored to its previous condition without additional compensation.
2.Crafco™ and Pavon™. 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 followin g 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
405.04 Method of Measurement.
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.
e.Curing 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.
405.04 Method 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.
405.05 Basis of Payment.
a.Unit Price Coverage . The amount of bituminous material used as directed for tack coat, measured as noted abo ve, 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 nece ssary to complete the work.
b.Payment will be made under Item No .: 405-A Tack Coat - per gallon {liter} SECTION 408 PLANING (MILLING) OF EXISTING PAVEMENT
408.01 Description.
This Section shall cover the work of rem oving existing asphalt pavement by either planing or micro - milling. Micro -milling is required to provide a more uniform surface than can be achieved by planing.
408.02 Equipment.
The planing and micro -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 du st from escaping the milling operation; • Capable of maintai ning 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 equipment shall be capable of removing pavement to an accuracy of 1/16 of an inch.
408.03 Construction Requirements.
a.Pavement Removal . 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 increa sed 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.
Source: Alabama Standard Specifications for Highway Construction, 2022 Edition. Pages 197–200 of 934.