321216_Specification 1 .doc

SECTION 321216

hot-mix asphalt paving

SPEC WRITER: THIS SECTION SPECIFIES HOT-MIX ASPHALT PAVING, PATCHING, AND PAVING OVERLY.

part 1 - -GENERAL

1.1 SUMMARY

A. This Section includes hot-mix asphalt paving and the following:

1. Aggregates

2. Asphalt binder

3. Tack coat

4. Pavement-marking paint

5. Wheel stops

1.2 SUBMITTALS

A. Product Data: For each type of product indicated. Include technical data and tested physical and performance properties.

B. Job-Mix Designs: Certification, by authorities having jurisdiction, of approval of each job mix proposed for the Work.

C. Material certificates.

D. Field Quality Control Test Reports

1.3 QUALITY ASSURANCE

A. Manufacturer Qualifications: Manufacturer shall be registered with and approved by authorities having jurisdiction or the DOT of the state in which Project is located.

SPEC WRITER: RETAIN FIRST PARAGRAPH BELOW IF ASPHALT PAVING WORK IS LOCATED ON PUBLIC PROPERTY AND MUST COMPLY WITH REQUIREMENTS OF STATE OR LOCAL DOT. ALSO RETAIN IF REFERENCING THESE REQUIREMENTS REGARDLESS OF PROPERTY OWNERSHIP.

B. Regulatory Requirements: Comply with City of St. Maries standards for asphalt paving work and Idaho Standards for Public Works.

1.4 PROJECT CONDITIONS

A. Environmental Limitations: Do not apply asphalt materials if subgrade is wet or excessively damp or if the following conditions are not met:

1. Tack Coat: Minimum surface temperature of 60 deg F (15.5 deg C).

SPEC WRITER: REVISE TEMPERATURE BELOW TO SUIT PROJECT. THICKER ASPHALT BASE COURSES MAY BE PLACED IF SURFACE TEMPERATURE EXCEEDS FREEZING.

2. Asphalt Surface Course: Minimum surface temperature of 60 deg F (15.5 deg C) at time of placement.

B. Pavement-Marking Paint: Proceed with pavement marking only on clean, dry surfaces and at a minimum ambient or surface temperature of 40 deg F (4 deg C) for oil-based materials, 50 deg F (10 deg C) for water-based materials, and not exceeding 95 deg F (35 deg C).

part 2 - PRODUCTS

1.5 AGGREGATES

A. Coarse Aggregate: ASTM D 692, sound; angular crushed stone, crushed gravel, or properly cured, crushed blast-furnace slag.

B. Fine Aggregate: ASTM D 1073, sharp-edged natural sand or sand prepared from stone, gravel, properly cured blast-furnace slag, or combinations thereof.

SPEC WRITER: DELETE BELOW IF NOT COMMON IN LOCAL PAVING MIXTURES.

C. Mineral Filler: ASTM D 242, rock or slag dust, hydraulic cement, or other inert material.

1.6 AUXILIARY MATERIALS

SPEC WRITER: RETAIN PARAGRAPH BELOW FOR WEED CONTROL.

SPEC WRITER: RETAIN ONE OF FIRST TWO PARAGRAPHS AND ASSOCIATED SUBPARAGRAPH BELOW OR DELETE BOTH IF NO PAVEMENT MARKING IS REQUIRED. DRYING TIME OF TYPE N IN FIRST PARAGRAPH IS 15 TO 30 MINUTES. FS TT-P-115, TYPE II OR AASHTO M 248K, TYPE F DRIES FASTER, IN 3 TO 6 MINUTES. VERIFY AVAILABILITY WITH MARKING-PAINT MANUFACTURERS. ALKYD-RESIN-TYPE PAVEMENT COATINGS EXCEED 150-G/L VOC LIMITS IMPOSED BY THE EPA FOR TRAFFIC-MARKING COATINGS, BUT MAY MEET 450-G/L VOC LIMITS IMPOSED BY THE EPA FOR ZONE-MARKING COATINGS.

A. Pavement-Marking Paint: Alkyd-resin type, lead and chromate free, ready mixed, complying with FS TT-P-115, AASHTO M 248.

SPEC WRITER: SELECT FROM COLORS BELOW; DISTINGUISH LOCATIONS IF MORE THAN ONE COLOR IS REQUIRED.

1. Color: Yellow.

SPEC WRITER: SOME FORMULATIONS OF WATERBORNE EMULSIONS ARE VERY QUICK DRYING, OTHERS LESS SO; SEE MANUFACTURER’S LITERATURE.

B. Pavement-Marking Paint: Latex, waterborne emulsion, lead and chromate free, ready mixed, complying with FS TT-P-1952, with drying time of less than [3] [45] minutes.

SPEC WRITER: SELECT FROM COLORS BELOW; DISTINGUISH LOCATIONS IF MORE THAN ONE COLOR IS REQUIRED.

1. Color: Yellow.

SPEC WRITER: DELETE BELOW IF WHEEL STOPS ARE NOT REQUIRED. REVISE CONCRETE STRENGTH OR DIMENSIONS OF WHEEL STOPS TO SUIT PROJECT.

C. Wheel Stops: Remove and reinstall to match the existing arrangement and anchoring system.

1.7 MIXES

SP-3 1/2 inch aggregate, PG 58-28 Superpave

EXECUTION

1.8 PATCHING

SPEC WRITER: RETAIN THIS ARTICLE IF REMOVING A COURSE OR LAYER FROM AN EXISTING HOT-MIX ASPHALT PAVEMENT.

A. Hot-Mix Asphalt Pavement: Saw cut perimeter of patch and excavate existing pavement section to sound base. Excavate rectangular or trapezoidal patches, extending 12 inches (300 mm) into adjacent sound pavement, unless otherwise indicated. Cut excavation faces vertically. Remove excavated material. Recompact existing unbound-aggregate base course to form new subgrade.

SPEC WRITER: RETAIN FIRST PARAGRAPH BELOW FOR COATING VERTICAL SURFACES ABUTTING HOT-MIX ASPHALT PATCHES.

B. Tack Coat: Apply uniformly to vertical surfaces abutting or projecting into new, hot-mix asphalt paving at a rate of 0.05 to 0.15 gal. /sq. yd. (0.2 to 0.7 L/sq. m).

C. Patching: Fill excavated pavements with hot-mix asphalt base mix and, while still hot, compact flush with adjacent surface.

1.9 SURFACE PREPARATION

A. Proof-roll subbases using heavy, pneumatic-tired rollers to locate areas that are unstable or that require further compaction.

B. Immediately before placing asphalt materials, remove loose and deleterious material from substrate surfaces. Ensure that prepared subgrade is ready to receive paving.

1. Sweep loose granular particles from surface of unbound-aggregate base course. Do not dislodge or disturb aggregate embedded in compacted surface of base course.

SPEC WRITER: DELETE PARAGRAPHS BELOW IF NO WEED CONTROL IS REQUIRED.

C. Herbicide Treatment: Apply herbicide according to manufacturer's recommended rates and written application instructions. Apply to dry, prepared subgrade or surface of compacted-aggregate base before applying paving materials.

SPEC WRITER: RETAIN BELOW IF TACK COATING AN EXISTING HOT-MIX ASPHALT PAVEMENT BEFORE PLACING A PAVING OVERLY.

D. Tack Coat: Apply uniformly to surfaces of existing pavement at a rate of 0.05 to 0.15 gal. /sq. yd. (0.2 to 0.7 L/sq. m).

1. Allow tack coat to cure undisturbed before applying hot-mix asphalt paving.

2. Avoid smearing or staining adjoining surfaces, appurtenances, and surroundings. Remove spillages and clean affected surfaces.

1.10 HOT-MIX ASPHALT PLACING

SPEC WRITER: IN ADDITION TO NEW WORK, THIS ARTICLE APPLIES TO HOT-MIX ASPHALT PAVING OVERLAY ON EXISRTING ASPHALT OR CONCRETE PAVEMENTS.

A. Machine place hot-mix asphalt on prepared surface, spread uniformly, and strike off. Place asphalt mix by hand to areas inaccessible to equipment in a manner that prevents segregation of mix. Place each course to required grade, cross section, and thickness when compacted.

SPEC WRITER: REVISE FIRST SUBPARAGRAPH BELOW TO HIGHER TEMPERATURE IF THIN LIFTS IN COOL WEATHER ARE LIKELY. SEE NATIONAL ASPHALT PAVEMENT ASSOCIATION RECOMMENDATIONS.

1. Spread mix at minimum temperature of 250 deg F (121 deg C).

2. Regulate paver machine speed to obtain smooth, continuous surface free of pulls and tears in asphalt-paving mat.

B. Place paving in consecutive strips not less than 10 feet (3 m) wide unless infill edge strips of a lesser width are required.

C. Promptly correct surface irregularities in paving course behind paver. Use suitable hand tools to remove excess material forming high spots. Fill depressions with hot-mix asphalt to prevent segregation of mix; use suitable hand tools to smooth surface.

1.11 COMPACTION

A. General: Begin compaction as soon as placed hot-mix paving will bear roller weight without excessive displacement. Compact hot-mix paving with hot, hand tampers or vibratory-plate compactors in areas inaccessible to rollers.

1. Complete compaction before mix temperature cools to 185 deg F (85 deg C).

B. Breakdown Rolling: Complete breakdown or initial rolling immediately after rolling joints and outside edge. Examine surface immediately after breakdown rolling for indicated crown, grade, and smoothness. Correct laydown and rolling operations to comply with requirements.

C. Intermediate Rolling: Begin intermediate rolling immediately after breakdown rolling while hot-mix asphalt is still hot enough to achieve specified density. Continue rolling until hot-mix asphalt course has been uniformly compacted to the following density:

1. Average Density: 92 percent of reference maximum theoretical density according to ASTM D 2041, but not less than 90 percent nor greater than 96 percent.

D. Finish Rolling: Finish roll paved surfaces to remove roller marks while hot-mix asphalt is still warm.

E. Protection: After final rolling, do not permit vehicular traffic on pavement until it has cooled and hardened.

F. Erect barricades to protect paving from traffic until mixture has cooled enough not to become marked.

1.12 INSTALLATION TOLERANCES

A. Thickness: Compact each course to produce the thickness indicated within the following tolerances:

SPEC WRITER: RETAIN THICKNESS TOLERANCES BELOW OR REVISE TO SUIT PROJECT.

1. Surface Course: Plus 1/4 inch (6 mm), no minus.

B. Surface Smoothness: Compact each course to produce a surface smoothness within the following tolerances as determined by using a 10-foot (3-m) straightedge applied transversely or longitudinally to paved areas:

SPEC WRITER: REVISE SUBPARAGRAPH ABOVE OR BELOW TO SUIT PROJECT.

1. Surface Course: 1/8 inch

SPEC WRITER: DELETE BELOW IF NO CROWNED PAVEMENT SURFACES ARE REQUIRED.

2. Crowned Surfaces: Test with crowned template centered and at right angle to crown. Maximum allowable variance from template is 1/4 inch (6 mm).

1.13 PAVEMENT MARKING

SPEC WRITER: DELETE BELOW IF NO PAVEMENT MARKING IS REQUIRED.

SPEC WRITER: MARKING-PAINT MANUFACTURERS CAUTION THAT PAINT WILL BLEED OR TEAR SURFACE HAS NEW ASPHALT UNLESS ASPHALT IS AGED BEFORE PAINTING. THIS AGING PERIOD MAY VARY FROM 30 TO 90 DAYS. IF PAVEMENT MARKING MUST PROCEED IMMEDIATELY, CONSIDER REVISING TO A PHASED APPLICATION OF A THIN FIRST COAT FOLLOWED BY A THICKER SECOND COAT ONCE ASPHALT HAS AGED. VERIFY THAT TWO-COAT APPLICATION IS RECOMMENDED BY PAVEMENT –MARKING MANUFACTURER.

A. Allow paving to age for 30 days before starting pavement marking.

B. Sweep and clean surface to eliminate loose material and dust.

C. Apply paint with mechanical equipment to produce pavement markings, of dimensions indicated, with uniform, straight edges. Apply at manufacturer's recommended rates to provide a minimum wet film thickness of 15 mils (0.4 mm).

1. Broadcast glass spheres uniformly into wet pavement markings at a rate of 6 lb/gal. (0.72 kg/L).

1.14 WHEEL STOPS

SPEC WRITER: DELETE THIS ARTICLE IF NO WHEEL STOPS ARE REQUIRED.

A. Securely attach wheel stops into pavement with not less than two galvanized steel dowels embedded at one-quarter to one-third points. Securely install dowels into pavement and bond to wheel stop. Recess head of dowel beneath top of wheel stop.

1.15 FIELD QUALITY CONTROL

A. Testing Agency: Contractor will engage a qualified independent testing and inspecting agency to perform field tests and inspections and to prepare test reports.

B. Additional testing and inspecting, at Contractor's expense, will be performed to determine compliance of replaced or additional work with specified requirements.

C. Remove and replace or install additional hot-mix asphalt where test results or measurements indicate that it does not comply with specified requirements.

1.16 DISPOSAL

SPEC WRITER: RETAIN THIS ARTICLE IF REPAIRS, PATCHING, OR COLD MILLING OF EXISTING PAVEMENT IS REQUIRED.

A. Except for material indicated to be recycled, remove excavated materials from Project site and legally dispose of them in an EPA-approved landfill.

END OF SECTION 321216

321216 - 1

HOT-MIX ASPHALT PAVING