36C78619Q0144-003.pdf

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SECTION 32 01 17.61

ASPHALT PAVEMENT CRACK SEALING

PART 1 GENERAL

1.1 DESCRIPTION

This work consists of sealing cracks in existing asphalt pavement.

1.2 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

ASTM INTERNATIONAL (ASTM)

ASTM D5078 (2016) Standard Specification for Crack Filler, Hot-Applied, for Asphalt Concrete and Portland

Cement Concrete Pavements

ASTM D6690 (2015) Standard Specification for Joint and

Crack Sealants, Hot Applied, for Concrete and

Asphalt Pavements

ASTM D789 (2015) Determination of Relative Viscosity and

Moisture Content of Polyamide (PA)

1.3 DELIVERY, STORAGE, AND HANDLING

Inspect materials delivered to the job site for defects; unload, and store them with a minimum of handling to avoid damage. Provide storage facilities at the job site to protect materials from weather and maintain them at the temperatures recommended by the manufacturer.

1.4 EQUIPMENT, TOOLS, AND MACHINES

Equipment, tools, and machines used in performance of the work are subject to approval by the Contracting Officer. Maintain in a satisfactory working condition at all times.

1.4.1 Waterblasting Equipment

Include with the waterblasting equipment a trailer-mounted water tank, pumps, high-pressure hose, wand with safety release cutoff control, nozzle, and auxiliary water resupply equipment. Use water tank and

CEMHodsoJ Highlight

32 12 18 - 2 auxiliary resupply equipment with sufficient capacity to permit continuous operations. Use hoses, wands, and nozzles capable of cleaning the crack faces and the pavement surface on both sides of the crack for a width of at least 1/2 inch beyond the crack. Use pump with a mounted pressure gauge that shows the pressure in psi at which the equipment is operating at all times. Limit the pressure so that the sides of the crack are not damaged during the cleaning operation.

1.4.2 Hot-Compressed Air Lance

A lance capable of providing clean, oil-free compressed air at a volume of 100 cubic feet per minute at a pressure of 120 pounds per square inch and at a temperature of 2000 degrees F.

1.4.3 Squeegee

A hand-held squeegee for ensuring that the crack is filled to the existing surface.

1.4.4 Hand Tools

Hand tools may be used, when approved, for removing defective sealant from cracks and repairing or cleaning the crack faces.

1.4.5 Crack Sealing Equipment

Provide unit applicators, used for heating and installing the hot-poured crack sealant materials, that are mobile and equipped with a double-boiler, agitator-type kettle with an oil medium in the outer space for heat transfer; a direct-connected pressure-type extruding device with a nozzle shaped for inserting in the crack to be filled; positive temperature devices for controlling the temperature of the transfer oil and sealant; and a recording type thermometer for indicating the temperature of the sealant. Allow the sealant to circulate through the delivery hose and return to the inner kettle when not in use, due to the applicator unit design. A crack sealant applicator wand attached to a heated hose that is attached to a heated sealant chamber.

1.5 ENVIRONMENTAL REQUIREMENTS

Apply the materials only when the ambient air temperature and the pavement temperature within the joint wall are at least 50 degrees F and rising. Do not apply sealant if moisture is observed in the crack.

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PART 2 PRODUCTS

2.1 SEALANTS

Provide sealants conforming to ASTM D6690, Type II.

2.2 FILLER

Provide fillers conforming to ASTM D5078, hot-applied, pourable, self-adhesive mastic composed of composed of highly modified polymer asphalt binder and durable lightweight construction aggregate such as Crafco

PolyPatch or approved equal.

PART 3 EXECUTION

3.1 PREPARATION OF CRACKS

Immediately before the installation of the crack sealant, thoroughly dry and clean the cracks to remove oxidized pavement, loose aggregate and foreign debris. Prepare cracks as follows:

3.1.1 Cracks

3.1.1.1 Hairline Cracks

Cracks that are less than 1/4 inch wide do not need to be sealed.

3.1.1.2 Small Cracks

For cracks that are 1/4 to 3/4 inch wide, sandblast or waterblast, and clean and dry using compressed air.

3.1.1.3 Medium Cracks

Sandblast or waterblast cracks that are 3/4 to 2 inches wide and clean and dry using compressed air. Fill flush to 1/4 inches below the existing surface with an approved filler.

3.1.1.4 Large Cracks

Repair cracks that are greater than 2 inches wide using pothole repair techniques instead of sealing.

3.1.2 Existing Sealant Removal

Cut loose the in-place sealant from both crack faces and to a depth shown on the drawings using a concrete saw or hand tools. Remove sealant to a

32 12 18 - 4 depth sufficient to accommodate any backer rod material that is required to maintain the depth of new sealant to be installed. Prior to further cleaning operations, remove all old loose sealant remaining in the crack opening by blowing with compressed air.

3.1.3 Sandblasting and Waterblasing

Sandblast or waterblast clean the crack faces and the pavement surfaces extending a minimum of 1/2 inch from the crack edges. Use a multiple-pass technique until the surfaces are free of dust, dirt, old sealant residue, or foreign debris that might prevent the sealant material from bonding to the asphalt pavement. After final cleaning and immediately prior to sealing, blow out the cracks with compressed air and leave them completely free of debris and water. Ensure that blasting does not damage the pavement.

3.1.4 Rate of Progress of Crack Preparation

Limit the stages of crack preparation, to only that linear footage that can be sealed during the same day.

3.2 PREPARATION OF SEALANT

Do not heat hot-poured sealants in excess of the safe heating temperature recommended by the manufacturer, as shown on the sealant containers.

Withdraw and waste sealant that has been overheated or subjected to application temperatures for over 4 hours or that has remained in the applicator at the end of the day's operation.

3.3 INSTALLATION OF SEALANT

Submit manufacturer's instructions 7 calendar days prior to the use of the material on the project. Installation of the material will not be allowed until the instructions are received.

3.3.1 Time of Application

Seal cracks immediately following final cleaning and drying of the crack walls. Place sealant only when cracks are dry. Reclean cracks that cannot be sealed under the conditions specified, or when rain interrupts sealing operations, and allow to dry or dry by mechanical means prior to installing the sealant.

3.3.2 Sealing the Crack

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Immediately preceding, but not more than 50 feet ahead of the crack sealing operations, perform a final cleaning and drying with compressed air. Fill the cracks from the bottom of reservoir up to 1/4 inch below the pavement surface. Remove excess or spilled sealant from the pavement by approved methods and discard it. Install the sealant in a manner which prevents the formation of voids and entrapped air. Several passes with the applicator wand may be necessary to obtain the specified sealant depth from the pavement surface. Do not use gravity methods or pouring pots to install the sealant material. Do not permit traffic over newly sealed pavement until authorized by the Contracting Officer’s

Representative. Check cracks frequently to ensure that the newly installed sealant is cured to a tack-free condition within 3 hours.

Immediately notify the Contracting Officer of the location of any sealant that has not cured to a tack-free condition within 3 hours.

3.4 CRACK SEALANT INSTALLATION TEST SECTION

Prior to the cleaning and sealing of the cracks for the entire project, construct a test section at least 200 feet long using the specified materials and approved equipment to demonstrate the proposed sealing of all cracks of the project. Following the completion of the test section and before any other crack is sealed, inspect the test section to determine that the materials and installation meet the requirements specified. If materials or installation do not meet requirements, remove the materials and reclean and reseal the cracks at no cost to the

Government. When the test section meets the requirements, it may be incorporated into the permanent work and paid for at the contract unit price per linear foot for sealing items scheduled. Seal all other cracks in the manner approved and successfully completed for sealing the test section.

3.5 CLEANUP

Upon completion of the project, remove unused materials from the site and leave the pavement in a clean condition.

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SECTION 32 12 36.13 Page 1

SECTION 32 12 36.13

ASPHALTIC SEAL AND FOG COATS

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AMERICAN ASSOCIATION OF STATE HIGHWAY AND TRANSPORTATION OFFICIALS

(AASHTO)

AASHTO M 226 (1980; R 2017) Standard Specification for

Viscosity-Graded Asphalt Cement

AASHTO M 81 (1992; R 2017) Standard Specification for Cutback Asphalt (Rapid-Curing Type)

AASHTO M 82 (2017) Standard Specification for Cutback Asphalt (Medium-Curing Type)

ASTM INTERNATIONAL (ASTM)

ASTM C131/C131M (2014) Standard Test Method for Resistance to Degradation of Small-Size Coarse Aggregate by Abrasion and Impact in the Los Angeles Machine

ASTM C136/C136M (2014) Standard Test Method for Sieve

Analysis of Fine and Coarse Aggregates

ASTM C142/C142M (2017) Standard Test Method for Clay Lumps and Friable Particles in Aggregates

ASTM C29/C29M (2017a) Standard Test Method for Bulk

Density ("Unit Weight") and Voids in Aggregate

ASTM D1250 (2008) Standard Guide for Use of the

Petroleum Measurement Tables

ASTM D140/D140M (2016) Standard Practice for Sampling Asphalt Materials

ASTM D2027/D2027M (2013) Cutback Asphalt (Medium-Curing Type)

ASTM D2028/D2028M (2015) Cutback Asphalt (Rapid-Curing Type)

ASTM D2397/D2397M (2017) Standard Specification for Cationic

Emulsified Asphalt

ASTM D2995 (1999; R 2009) Determining Application Rate of Bituminous Distributors

SECTION 32 12 36.13 Page 2

ASTM D3381/D3381M (2013) Viscosity-Graded Asphalt Cement for Use in Pavement Construction

ASTM D3625/D3625M (2012) Standard Practice for Effect of

Water on Bituminous-Coated Aggregate Using Boiling Water

ASTM D4791 (2010) Flat Particles, Elongated

Particles, or Flat and Elongated Particles in Coarse Aggregate

ASTM D75/D75M (2014) Standard Practice for Sampling

Aggregates

ASTM D946/D946M (2015) Penetration-Graded Asphalt Cement for Use in Pavement Construction

ASTM D977 (2017) Standard Specification for

Emulsified Asphalt

U.S. FEDERAL HIGHWAY ADMINISTRATION (FHWA)

MUTCD (2015) Manual on Uniform Traffic Control

Devices

1.2 SUBMITTALS

SD-03 Product Data

Waybills and Delivery Tickets Equipment List Inspection Reports

SD-04 Samples

Bituminous Materials Aggregates

SD-06 Test Reports

Tests

1.3 EQUIPMENT, TOOLS, AND MACHINES

Equipment, plant and tools used in the work are subject to approval.

Maintain in a satisfactory working condition at all times. Provide equipment which is adequate and has the capability of producing the results specified. Provide calibrated equipment, such as asphalt distributors, scales, batching equipment, spreaders and similar equipment, that has been calibrated by an approved calibration laboratory within 12 months prior to commencing work. Submit an equipment list with calibration reports.

1.3.1 Bituminous Distributors

Provide distributors that have pneumatic tires of sufficient size and number to prevent rutting, shoving, or otherwise damaging any part of the pavement structure. Use distributors that distribute the bituminous

SECTION 32 12 36.13 Page 3 material in a uniform double or triple lap at the specified temperature, at readily determined and controlled rates from 0.23 to 9.05 L/square meter (0.05 to 2.0 gallons/square yard), with a pressure range of 172.4 to 517.1 kPa (25 to 75 psi) with an allowable variation from the specified rate of not more than plus or minus 5 percent, and at variable widths. Include in the distributor equipment a separate power unit for the bitumen pump, full-circulation spray bars, tachometer, pressure gauges, volume-measuring devices, adequate heaters for heating of materials to the proper application temperature, a thermometer for reading the temperature of tank contents, and a hand-held hose attachment suitable for applying bituminous material manually to areas inaccessible to the distributor. Equip the distributor to circulate and agitate the bituminous material during the heating process.

Provide distributor with a horizontally and vertically adjustable spray nozzle bar. Make normal width of bar application at least 3.7 m (12 feet), with provisions for lesser or larger width when necessary. Equip distributor with a meter having a dial registering feet of travel/min and a meter that registers the application rate in gallons/square yard. Make both dials visible to the distributor driver. Provide a thermometer and well, not in contact with any heating tubes, for accurately indicating temperature of asphalt emulsion.

1.3.2 Aggregate Spreader

Use aggregate-spreading equipment that is adjustable and capable of uniformly spreading aggregate at the specified rate in a single-pass operation over the surface to be sealed.

1.3.3 Pneumatic-Tired Roller

Provide a pneumatic-tired roller of sufficient size to seat the cover aggregate into the bituminous material without fracturing the aggregate particles. Use rollers that have a total compacting width of not less than

1.52 m (5 feet) and a tire pressure of at least 350 Kpa (50 psi). Use rollers that weigh at least 8,182 Kg (18,000 pounds).

1.3.4 Power Brooms and Power Blowers

Provide power brooms and power blowers suitable for cleaning surfaces to which the seal coat is to be applied.

1.3.5 Storage Tanks

Provide tanks capable of heating the bituminous material, under effective and positive control at all times, to the required temperature. Accomplish heating by steam coils, hot oil, or electricity. Affix to the tank an armored thermometer with a range from 37.8 to 148.9 degrees C (100 to 300 degrees F) so that the temperature of the bituminous material may be read at all times.

1.3.6 Single-Pass, Surface-Treatment Machines

Provide machines capable of spraying bituminous material and spreading aggregate in one pass; of distributing the bituminous material uniformly, at even heat, and in controlled amounts; and immediately spreading aggregates uniformly, in controlled amounts, over the surface to be sealed.

1.3.7 Vacuum Sweepers

Provide self-propelled, vacuum pickup sweeper capable of removing loose sand, SECTION 32 12 36.13 Page 4 water, and debris from pavement surface.

1.5 QUALITY ASSURANCE

Perform sampling and testing using an approved commercial testing laboratory or facilities furnished by the Contractor. Perform tests in sufficient numbers, and at the location and times directed, to ensure that the materials meet specified requirements.

1.5.1 Samples

Take aggregate samples for laboratory tests in accordance with ASTM D75/D75M.

Take samples of bituminous material in accordance with ASTM D140/D140M.

1.5.2 Aggregates Source

Select sources from which aggregates are to be obtained and notify the Contracting Officer within 15 days after the award of the Contract. Perform tests for the evaluation of aggregates by using an approved commercial laboratory at no expense to the Government. Tests for determining the suitability of aggregate include, but are not limited to: gradation in accordance with ASTM C136/C136M, abrasion resistance in accordance with ASTM C131/C131M, clay lumps and friable particles in accordance with ASTM C142/C142M, unit weight and voids in accordance with ASTM C29/C29M, and flat and elongated particles in accordance with ASTM D4791.

1.5.3 Bituminous Material Source

Select sources from which bituminous materials are to be obtained and notify the Contracting Officer within 15 days after the award of the contract.

1.5.4 Equipment Calibration

Furnish all equipment, materials and labor necessary to calibrate the bituminous distributor and the aggregate spreader. Perform all calibrations with the approved job materials and prior to applying the specified coatings to the prepared surface. Perform calibration of the bituminous distributor in accordance with ASTM D2995. Inspect all equipment prior to start of work and at regular intervals as needed during work.

1.6 DELIVERY, STORAGE, AND HANDLING

Deliver asphalt materials to the site in a homogenous and undamaged condition. Inspect the materials for contamination and damage. Unload and store the materials with a minimum of handling. Protect stored aggregate from contamination and segregation. Replace defective or damaged materials.

1.7 ENVIRONMENTAL REQUIREMENTS

Apply the coating when the existing surface is dry, and when the weather is not foggy, rainy, or when the wind velocity will prevent the uniform application of the bitumen or aggregates. Apply the bituminous seal coat only when the atmospheric temperature is above 15.5 degrees C (60 degrees F) in the shade and when the pavement surface temperature is above 15.5 degrees C (60 degrees F), unless otherwise directed.

PART 2 PRODUCTS

SECTION 32 12 36.13 Page 5

2.1 BITUMINOUS MATERIAL FOR SEAL COAT

NOTE:

Emulsified asphalt grades RS-1, RS-2, CRS-1, and CRS-2 are suitable for seal coat applications.

Emulsions are better suited to coat aggregate when the aggregate moisture content is over 1 percent but less than 3 percent. The following considerations should be included in the evaluation of alternate grades to be specified for the project:

a. Local practice and experience, as well as availability and cost of various grades within the area.

b. The rapid-setting emulsions, particularly the cationic types, are effective when damp aggregates must be used.

c. Where cooler temperatures are anticipated, consider the use of CRS-1 and CRS-2 grades.

d. Anionic emulsions provide better adhesion to basic aggregates such as limestone, while cationic emulsions are better with acidic aggregates such as silicates.

Use bituminous material conforming to [AASHTO M 81] [AASHTO M 82] [ AASHTO M 226] or [ASTM D946/D946M] [ASTM D977] [ASTM D2027/D2027M] [ ASTM D2028/D2028M] [ASTM D2397/D2397M] [ASTM D3381/D3381M], [grade [ ]] [penetration grade [ ]].

2.2 AGGREGATE FOR SEAL COAT

Use aggregate consisting of crushed stone, crushed gravel, crushed slag, sand and screenings. Use aggregate with a moisture content of not greater than 3 percent such that the aggregate will readily bond with the bituminous material. Drying may be required, as directed. Use aggregate conforming to the gradation shown in TABLE I. Allowable aggregate gradation tolerances are given in TABLE II.

TABLE I. AGGREGATE GRADATIONS

(Percent by Weight Passing Square-Mesh Sieves)

Sieve Size Gradation

1/2 inch (12.5 mm) ---

3/8 in (9.5 mm) ---

No. 4 (4.75 mm) 100

No. 8 (2.36 mm) 10-40

No. 16 (1.18 mm) 0-10

No. 50 (0.30 mm) 0-5

SECTION 32 12 36.13 Page 6

TABLE II. AGGREGATE GRADATION TOLERANCES

Material Tolerances

Aggregate passing the 9.5 mm 3/8 inch sieve and larger sieves

Plus or minus 5 percent

Aggregate passing the 4.75 mm No. 4 and smaller sieves

Plus or minus 3 percent

2.2.1 Coarse Aggregate

Use coarse aggregate consisting of clean, sound, durable particles meeting the following requirements.

2.2.1.1 Film Retention

Use aggregate that exhibits not less than 95 percent retention of bituminous film (ASTM D3625/D3625M).

2.2.1.2 Particle Shapes

Use aggregate that has no more than 20 percent by weight of flat and elongated particles on any sieve when determined in accordance with ASTM D4791. A flat particle is one having a ratio of width to thickness greater than 3; an elongated particle is one having a ratio of length to width greater than 3.

2.2.1.3 Weight Loss

Use aggregate with a percent weight loss not exceeding 40 after 500 revolutions, as determined in accordance with ASTM C131/C131M.

2.2.1.4 Friable Particles

Use aggregate with no more than 0.1 percent of the total weight of aggregate sample consisting of friable particles when tested in accordance with ASTM C142/C142M.

2.2.1.5 Crushed Slag

Use crushed slag aggregate with a dry weight not less than 1200 kg/cubic meter (75 pcf), as determined in accordance with ASTM C29/C29M.

2.2.1.6 Crushed Aggregate

Crushed aggregate retained on the No. 4 (4.75 mm) sieve and each coarser sieve must contain at least 75 percent by weight of crushed pieces having one or more fractured faces with the area of each face equal to at least 75 percent of the smaller midsectional area of the aggregate particle. When two fractures are contiguous, the angle between the planes of fractures must be at least 30 degrees to count as two fractured faces.

2.2.2 Fine Aggregate

Use fine aggregate consisting of clean, sound, durable particles of crushed stone, slag, or crushed gravel. Use aggregate that meet the requirements for stripping, abrasion resistance and percent friable particles as specified for coarse aggregate.

SECTION 32 12 36.13 Page 7

2.3 WATER

Provide fresh, clean, and potable water.

PART 3 EXECUTION

3.1 PREPARATION OF SURFACE

Repair damaged surface and fill cracks before starting work. Immediately before starting work, remove all loose material, dirt, clay, or other objectionable material from the surface to be treated with power brooms or power blowers, if needed. Paint firmly bonded to the surface may remain.

Do not mix material removed from the surface with the cover aggregate.

3.2 SEAL COAT APPLICATION

3.2.1 Rate

Spread the bituminous material in the quantities shown in TABLE III. The exact quantities within the range specified, which may be varied to suit field conditions, will be determined by the Contractor and approved by the Contracting Officer’s Representative prior to use. The bituminous quantities may have to be increased when the pavement has rough surface texture and may have to be decreased when the pavement surface is very tight.

TABLE III. APPLICATION OF MATERIAL

(Quantities Per Square Meter)

Bitumen, liters (gallons)

Aggregate, kg (pounds)

0.45-0.60 (0.10-0.15) 5-8 (10-15)

3.2.2 Temperature

Apply asphalt at a temperature that will provide an application viscosity between 10 and 60 seconds, Saybolt Furol, or between 20 and 120 square mm/sec 20 and 120 centistokes, kinematic. Furnish the temperature/viscosity relationship to the Contracting Officer.

3.2.3 Application of Bituminous Material

Following the preparation and inspection of the pavement surface, apply the seal coat material at the specified application rates. Uniformly apply the bituminous material in a single pass of the distributor and with either a double or triple lap spray over the surface to be sealed. Spread building paper on the surface for a sufficient distance back from the ends of each application so that flow through the spray bar may be started and stopped on the paper and so that all sprays will be operating at the proper pressure on the surface to be sealed. Immediately after the bituminous material application, remove the building paper. Apply bituminous material to all areas missed with the distributor. No smoking, fires, or flames, other than the heaters that are a part of the equipment, will be permitted within 8 meters (25 feet) of heating, distributing, and transferring operations of bituminous material other than bituminous emulsions.

3.2.4 Aggregate Application Rate

SECTION 32 12 36.13 Page 8

Spread the aggregate in the quantities shown in TABLE III. The exact quantities within the range specified, which may be varied to suit field conditions, will be determined by the Contractor, and approved by the Contracting Officer’s Representative prior to use. The aggregate weights shown in this table are those of aggregate having a specific gravity of

2.65. If the specific gravity of the aggregate to be used is less than 2.55 or greater than 2.75, make adjustments in the number of kilograms (pounds) of aggregate required per square meter (yard) to insure a constant volume of aggregate per square meter (yard) of treatment.

3.2.5 Application of Aggregate

Emulsified Asphalt 3 to 4 minutes

Spread the specified quantity of cover aggregate uniformly over the bituminous material. Provide sufficient aggregate on trucks at the work site to cover the distributor load of bituminous material before the bituminous material is applied. No bituminous material may be down more than 3 to 4 minutes before it is covered with aggregate. Uniformly spread aggregate with aggregate-spreading equipment. Lightly recover areas having insufficient cover with additional aggregate by hand during the operations whenever necessary.

3.2.6 Rolling and Brooming

Begin rolling operations immediately following the application of cover aggregate. Perform rolling using pneumatic-tired rollers. Operate the rollers at a speed that will not displace the aggregate. Continue rolling until the aggregate is uniformly distributed and keyed into the bituminous material. Sweep off the surface and remove all surplus aggregate not less than 24 hours nor more than 4 days after rolling is completed. Immediately prior to opening to traffic, roll the entire treated area with a self-propelled pneumatic-tired roller.

3.4 TRIAL APPLICATION - SEAL COAT

Prior to applying the seal coat, place a test section at least 30 meters (100 feet) long by 6 meters (20 feet) wide using the approved job materials and roll them in accordance with the specified requirements. Perform tests to determine the application rates of the bitumen and aggregate. If the tests indicate that the seal coat test section does not conform to the specification requirements, make necessary adjustments to the application equipment and to the spreading and rolling procedures, and construct additional test sections for conformance to the specifications. Where test sections do not conform to specification requirements, remove seal coat at no expense to the Government; no separate payment will be made for seal coat materials and labor, either in placement or removal of any test section.

3.6 SITE PROTECTION

During applications, protect adjacent buildings, structures, vehicles, manhole covers, valve covers, concrete curbs, sidewalks, inlet grates, and trees to prevent being spattered or marred.

3.7 TRAFFIC CONTROL

Protect freshly placed coatings from damage by traffic. Provide sufficient warning signs and barricades to prevent traffic over freshly treated

SECTION 32 12 36.13 Page 9 surfaces. Protect treated areas from traffic for at least 24 hours after final application of coatings, or for such time as necessary to prevent picking up. Provide warning signs and barricades for proper traffic control, in accordance with MUTCD.

-- End of Section --

08-01-16

32 17 23 - 1

SECTION 32 17 23

PAVEMENT MARKINGS

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Paint and reflective glass beads on pavement surfaces, in form of traffic lanes, parking bays, areas restricted to handicapped persons, crosswalks, and other detail pavement markings.

1.2 APPLICABLE PUBLICATIONS

A. Comply with references to extent specified in this section.

B. Federal Specifications (Fed. Spec.):

1. TT-B-1325D - Beads (Glass Spheres) Retro-Reflective.

2. TT-P-1952F - Paint, Traffic and Airfield Marking, Waterborne.

C. Master Painters Institute (MPI):

1. No. 97 - Traffic Marking Paint, Latex.

1.3 SUBMITTALS

A. Submittal Drawings:

1. Show pavement marking configuration and dimensions.

2. Show international symbol of accessibility at designated parking spaces.

B. Manufacturer's Literature and Data:

1. Description of each product.

2. Application instructions.

C. Samples:

1. Paint: 200 mm (8 inches) square, each type and color.

D. Certificates: Certify products comply with specifications.

E. Qualifications: Substantiate qualifications comply with specifications.

1. Installer with project experience list.

1.4 QUALITY ASSURANCE

A. Installer Qualifications:

1. Regularly installs specified products.

2. Installed specified products with satisfactory service on five similar installations for minimum five years.

a. Project Experience List: Provide contact names and addresses for completed projects.

32 17 23 - 2

1.5 DELIVERY

A. Deliver products in manufacturer's original sealed packaging.

B. Mark packaging, legibly. Indicate manufacturer's name or brand, type, color, production run number, and manufacture date.

C. Before installation, return or dispose of products within distorted, damaged, or opened packaging.

1.6 STORAGE AND HANDLING

A. Store products indoors in dry, weathertight conditioned facility.

B. Protect products from damage during handling and construction operations.

1.7 FIELD CONDITIONS

A. Environment:

1. Product Temperature: Minimum 13 degrees C (55 degrees F) for minimum

48 hours before installation.

a. Surface to be painted and ambient temperature: Minimum

10 degrees C (50 degrees F) and maximum 35 degrees C

(95 degrees F).

B. Field Measurements: Verify field conditions affecting traffic marking installation. Show field measurements on Submittal Drawings.

1.8 WARRANTY

A. Construction Warranty: FAR clause 52.246-21, "Warranty of

Construction."

PART 2 - PRODUCTS

2.1 SYSTEM PERFORMANCE

A. Design paint complying with specified performance:

1. Application: Fed. Spec. TT-P-1952.

2.2 SANDBLASTING EQUIPMENT

A. Air compressor, hoses, and nozzles of proper size and capacity as required for cleaning painted surfaces. Compressor to provide minimum

0.08 cu. m/s (150 cfm) of air at pressure of minimum 625 kPa (90 psi) at each nozzle used.

2.3 PAINT APPLICATOR

A. Apply marking paint with approved mechanical equipment. Provide equipment with constant agitation of paint and travel at controlled speeds. Synchronize one or more paint "guns" to automatically begin and

32 17 23 - 3 cut off paint flow in case of skip lines. Equipment to have manual control to apply continuous lines of varying length and marking widths as indicated on Drawings. Provide pneumatic spray guns for hand application of paint in areas where mobile paint applicator cannot be used. Use separate piece of equipment when equipment does not have glass bead dispenser. Adjust and synchronize equipment with paint applicator to distribute reflective beads on paint lines uniformly within ten seconds without any waste.

2.4 PAINT

A. Paint: MPI No. 97. For obliterating existing markings comply with

Fed. Spec. TT-P-1952. Provide minimum 18 L (5 gallons) containers.

2.5 REFLECTIVE GLASS BEADS

A. Beads: Comply with Fed. Spec. TT-B-1325, Type I, Gradation A. In regions of high humidity, coat beads with silicone or other suitable waterproofing material to ensure free flow. Provide glass beads in containers suitable for handling and strong enough to prevent loss during shipment.

PART 3 - EXECUTION

3.1 PREPARATION

A. Examine and verify substrate suitability for product installation.

1. Allow new pavement surfaces to cure for period of minimum 14 days before application of marking materials.

B. Protect existing construction and completed work from damage.

C. Clean substrates. Remove contaminants capable of affecting subsequently installed product's performance.

1. Remove dust, dirt, and other granular surface deposits by sweeping, blowing with compressed air, rinsing with water, or combination of these methods.

2. Completely remove rubber deposits, existing paint markings, and other coatings adhering to pavement with scrapers, wire brushings, sandblasting, mechanical abrasion, or approved chemicals as directed by Contracting Officer's Representative.

3. As an option, comply with Fed. Spec. TT-P-1952 for removal of existing paint markings on asphalt pavement. Apply black paint in as many coats as necessary to completely obliterate existing markings.

32 17 23 - 4

4. Scrub affected areas with several applications of trisodium phosphate solution or other approved detergent or degreaser, and rinse thoroughly after each application, where oil or grease are present on old pavements to be marked.

a. After cleaning, seal oil-soaked areas with cut shellac to prevent bleeding through new paint.

5. Clean and dry surface before pavement marking. Do not begin any marking until Contracting Officer's Representative inspected surface and gives permission to proceed.

3.2 TEMPORARY PAVEMENT MARKING

A. Apply Temporary Pavement Markings of colors, widths and lengths shown on drawings or directed by Contracting Officer's Representative. After temporary marking has served its purpose and when so ordered by

Contracting Officer's Representative, remove temporary marking to prevent damage on applied surface.

B. Provide approved preformed pressure sensitive, reflective, adhesive tape type of temporary pavement marking of required colors, widths and lengths in lieu of temporary painted marking. Continuous durability and effectiveness of such marking is required during period for which its use is required (i.e. 14-day cure period).

3.3 INSTALLATION - GENERAL

A. Install products according to manufacturer's instructions and approved submittal drawings.

1. When manufacturer's instructions deviate from specifications, submit proposed resolution for Contracting Officer's Representative consideration.

3.4 PAINT APPLICATION

A. Apply uniformly painted and reflective pavement marking of required colors, length, and width with true, sharp edges and ends on properly cured, prepared, and dried surfaces.

B. Comply with details as indicated on drawings and established control points.

C. Apply paint at wet film thickness of 0.4 mm (0.015 inch). Disperse reflective glass beads evenly on wet paint at rate of 720 g/L (6 pounds per gal.) of paint. Apply paint in one coat. When directed by

Contracting Officer's Representative, apply additional coats at markings showing light spots. Comply with paint manufacturer's maximum

32 17 23 - 5 drying time requirements to prevent undue softening of asphalt, and pick-up, displacement, or discoloration by tires of traffic.

D. When deficiency in marking drying occurs, discontinue paint operations until cause of slow drying is determined and corrected.

E. Remove and replace marking applied less than minimum material rates, deviates from true alignment, exceeds stipulated length and width tolerances, or shows light spots, faulty distribution of beads, smears, or other deficiencies or irregularities.

F. Remove marking by carefully controlled sandblasting, approved grinding equipment, or other approve method to prevent damage on applied surface.

3.5 DETAIL PAVEMENT MARKING APPLICATION

A. Apply Detail Pavement Markings, exclusive of actual traffic lane marking as follows:

1. At exit and entrance islands and turnouts.

2. On curbs.

3. At crosswalks.

4. At parking bays.

5. Other locations as indicated on drawings.

B. Apply International Handicapped Symbol at indicated parking spaces.

Color as shown on drawings. Apply paint for symbol using suitable template that will provide pavement marking with true, sharp edges and ends.

C. Install detail pavement markings of colors, widths and lengths, and design pattern at locations indicated on drawings.

3.6 TOLERANCES

A. Length and Width of Lines: Plus or minus 75 mm (3 inches) and plus or minus 3 mm (1/8 inch), respectively, in case of skip markings.

B. Length of intervals exceeding line length tolerance are not acceptable.

3.7 CLEANING

A. Remove excess paint before paint sets.

3.8 PROTECTION

A. Protect pavement markings from traffic and construction operations.

1. Protect newly painted markings from vehicular traffic until paint is dry and track free.

32 17 23 - 6

2. Place warning signs at beginning of wet line, and at points well in advance of marking equipment for alerting approaching traffic from both directions.

3. Place small flags or other similarly effective small objects near freshly applied markings at frequent intervals to reduce crossing by traffic.

B. Repair damage.

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