36C78618Q0402-007.pdf

11-01-16

ASPHALT PAVING

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SECTION 32 12 16

ASPHALT PAVING

PART 1 - GENERAL

1.1 SUMMARY

A. Section Includes:

1. Composition, mixing, and construction on prepared subgrade and protection of hot asphalt concrete pavement.

1.2 APPLICABLE PUBLICATIONS

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

B. American Association of State Highway and Transportation Officials

(AASHTO):

1. 2016 - Standard Specifications for Transportation Materials and

Methods of Sampling and Testing, and AASHTO Provisional Standards.

2. M320-10 - Performance-Graded Asphalt Binder.

3. T283-14 - Resistance of Compacted Asphalt Mixtures to

Moisture-Induced Damage.

C. Asphalt Institute:

1. Specification SS2.

D. ASTM International (ASTM):

1. C29/C29M-16 - Bulk Density ("Unit Weight") and Voids in Aggregate.

2. C977-10 - Quicklime and Hydrated Lime for Soil Stabilization.

3. D3786/D3786M-13 - Bursting Strength of Textile Fabrics-Diaphragm

Bursting Strength Tester Method.

4. D4355/D4355M-14 - Deterioration of Geotextiles by Exposure to Light, Moisture and Heat in a Xenon Arc Type Apparatus.

5. D4632/D46323M-15a - Grab Breaking Load and Elongation of

Geotextiles.

6. D6390-11 - Draindown Characteristics in Uncompacted Asphalt

Mixtures.

E. National Asphalt Paving Association (NAPA):

1. PS-33 (2009) - Porous Asphalt Pavements.

1.3 PREINSTALLATION MEETINGS

A. Conduct preinstallation meeting at project site minimum 30 days before beginning Work of this section.

1. Required Participants:

a. Contracting Officer's Representative (COR).

b. Contractor.

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c. Installer.

2. Meeting Agenda: Distribute agenda to participants minimum 3 days before meeting.

a. Installation schedule.

b. Installation sequence.

c. Preparatory work.

d. Protection before, during, and after installation.

e. Installation.

f. Terminations.

g. Transitions and connections to other work.

h. Inspecting and testing.

i. Other items affecting successful completion.

3. Document and distribute meeting minutes to participants to record decisions affecting installation.

1.4 SUBMITTALS

A. Submittal Procedures: Section 01 33 23, SHOP DRAWINGS, PRODUCT DATA, AND SAMPLES.

B. Test Reports: Certify products comply with specifications.

1. Aggregate Base Course.

2. Porous Asphalt and Asphalt Base/Surface Course.

3. Job-mix formula.

C. Certificates: Certify products comply with specifications.

1. Asphalt prime and tack coat material.

2. Asphalt cement.

3. Job-mix certification that mix equals or exceeds State Highway

Specification.

D. Qualifications: Substantiate qualifications comply with specifications.

1. Manufacturer with project experience list.

1.5 QUALITY ASSURANCE

A. Manufacturer Qualifications:

1. Regularly manufactures specified products.

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

B. COR to have access to all parts of material producing plants to check mixing operations and materials and adequacy of equipment.

C. Preconstruction Testing:

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1. Engage independent testing laboratory to perform tests and submit reports.

2. Asphalt Base Course:

a. Test sources, gradation, liquid limit, plasticity index, percentage of wear, and other properties typically required by

State Highway Department.

3. Porous Asphalt and Asphalt Base/Surface Course:

a. Test aggregate source, gradation, soundness loss, percentage of wear, and other properties typically required by State Highway

Department.

1.6 FIELD CONDITIONS

A. Environment:

1. Do not begin asphaltic concrete material placement when atmospheric temperature is below 10 degrees C (50 degrees F), nor during fog, rain, or other unsuitable conditions.

1.7 WARRANTY

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

Construction."

PART 2 - PRODUCTS

2.1 ASPHALT PAVING AGGREGATES

A. Aggregates: Crushed stone, gravel, sand, or other sound, durable mineral materials processed and blended, and naturally combined.

B. Subbase Aggregate: Maximum size 38 mm (1-1/2 inches). //

C. Base Aggregate Maximum Size:

1. Base course over 152 mm (6 inches) thick: 38 mm (1-1/2 inches).

2. Other base courses: 19 mm (3/4 inch).

D. Asphaltic Base Course:

1. Maximum Particle Size: 25 mm (1 inch).

2. In conflicts between this specification and requirements in latest version of State Highway Specifications, State Specifications take precedence.

E. Aggregates for Asphaltic Concrete Paving: Mixture of sand, mineral aggregate, and liquid asphalt in proportions with percentage by weight within the following:

Sieve Sizes Percentage Passing

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Sieve Sizes Percentage Passing

19 mm(3/4 inch) 100

9.5 mm(3/8 inch) 67 to 85

6.4 mm(1/4 inch) 50 to 65

2.4 mm(No. 8 mesh) 37 to 50

600 µm(No. 30 mesh) 15 to 25

75 µm(No. 200 mesh) 3 to 8

1. Plus 50/60 penetration liquid asphalt at 5 percent to 6-1/2 percent of combined dry aggregates.

2.2 ASPHALTS

A. Comply with Asphalt Institute Specification SS2:

1. Asphalt cement: Penetration grade 50/60.

2. Prime coat: Cut-back type, grade MC-250.

3. Tack coat: Uniformly emulsified, grade SS-1H.

PART 3 - EXECUTION

3.1 PREPARATION

A. Establish and control pavement (aggregate or asphalt base course and asphalt surface course) alignments, grades, elevations, and cross sections as shown on Drawings.

3.2 MIXING ASPHALTIC CONCRETE MATERIALS

A. Provide hot plant-mixed asphaltic concrete paving materials.

1. Temperature leaving plant: 143 degrees C (290 degrees F) minimum, 160 degrees C (320 degrees F) maximum.

2. Temperature at time of placing: 138 degrees C (280 degrees F) minimum.

3.3 SUBGRADE

A. Shape to line and grade and compact with self-propelled rollers.

B. Fill depressions developed under rolling with acceptable material and re-roll area.

C. Remove soft areas, fill with acceptable materials and re-roll area.

D. If subgrade becomes rutted or displaced before the placing of subbase, rework subgrade to bring to line and grade.

E. Proof-roll subgrade with maximum 45 tonne (50 ton) gross weight dump truck as directed by COR. If pumping, pushing, or other movement is observed, rework area to provide stable and compacted subgrade.

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3.4 BASE COURSES

A. Subbase:

1. Spread and compact to thickness shown on drawings.

2. Begin rolling at sides, continue toward center, and continue until there is no movement ahead of roller.

3. After completion of subbase rolling, no hauling is permitted over subbase, except top course material delivery.

B. Base:

1. Spread and compact to thickness shown on Drawings.

2. Begin rolling sides, continue toward center, and continue until there is no movement ahead of roller.

3. After completion of base rolling, no hauling is permitted over base except top course material delivery.

C. Thickness Tolerance: Compacted thicknesses shown on Drawings within minus 0.0 mm (0.0 inches) to plus 12.7 mm (0.5 inch).

D. Smoothness Tolerance: Lines and grades shown on Drawings within 5 mm in

3 m (3/16 inch in 10 feet).

E. Moisture Content: Only amount required to achieve specified compaction.

3.5 ASPHALTIC CONCRETE PAVING PLACEMENT

A. Remove all loose materials from compacted base.

B. Apply prime coat, and tack coat where required, and allow to dry according to manufacturer’s instructions as approved by Architect.

C. Receipt of Asphaltic Concrete Materials:

1. Do not accept material unless covered with tarpaulin until unloaded, and unless material is minimum 130 degrees C (280 degrees F).

2. Do not begin asphaltic concrete material placement when atmospheric temperature is below 10 degrees C (50 degrees F), nor during fog, rain, or other unsuitable conditions.

D. Spreading:

1. Spread material with minimal handling.

2. For finished paving 76 mm (3 inches) or less, spread in one layer.

E. Rolling:

1. After material has been spread to proper depth, roll until surface is hard, smooth, unyielding, and true to thickness and elevations shown on drawings.

2. Roll in minimum two directions until no roller marks are visible.

3. Finished paving smoothness tolerance:

a. No depressions which will retain standing water.

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b. Maximum deviation: 3 mm in 1.8 m (1/8 inch in 6 feet).

3.6 PATCHING

A. Hot Mix Asphalt Pavement: Sawcut patch perimeter and excavate existing pavement to sound base. Excavate rectangular or trapezoidal patches, extending 300 mm (12 inches) into adjacent sound pavement, unless otherwise indicated on drawings. Cut excavation faces vertically.

Remove excavated material. Recompact existing aggregate base course to provide new subgrade.

B. Tack Coat: Apply uniformly to vertical and horizontal surfaces abutting area to receive new hot mix asphalt paving at rate of 0.2 to 0.7 L/sq.

m. (0.05 to 0.15 gal./sq.yd).

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

2. Avoid smearing or staining adjoining surfaces, remove spillage and clean affected surfaces.

C. Patching: Fill excavated pavement with hot mix asphalt base mix for full thickness of patch; while still hot, compact flush with adjacent pavement surface.

3.7 CLEANING

A. Remove debris, rubbish, and excess material from project site.

3.8 PROTECTION

A. Protect asphaltic concrete paved areas from traffic until sealer is set and cured and does not pick up under foot or wheeled traffic.

B. Repair damage.

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3. Document and distribute meeting minutes to participants to record decisions affecting installation.

C. Patching: Fill excavated pavement with hot mix asphalt base mix for full thickness of patch; while still hot, compact flush with adjacent pavement surface.