Towne Square at Suitland Federal Center Fine Grading & Infrastructure Construction
Phases 1B/1C/2
SECTION 321216 - ASPHALT PAVING
PART 1 - GENERAL
1.1 SUMMARY
A. Section Includes:
1. Cold milling of existing asphalt pavement.
2. Hot-mix asphalt patching.
3. Hot-mix asphalt paving.
4. Hot-mix asphalt overlay.
5. Asphalt curbs.
B. Related Requirements:
1. Section 312000 "Earth Moving" for subgrade preparation, fill material, unbound-
aggregate subbase and base courses, and aggregate pavement shoulders.
2. Section 321373 "Concrete Paving Joint Sealants" for joint sealants and fillers at
pavement terminations.
1.2 PREINSTALLATION MEETINGS
A. Preinstallation Conference: Conduct conference at Project site.
1.3 ACTION SUBMITTALS
A. Product Data: For each type of product.
B. LEED Submittals:
1. Product Data for Credit MR 4: For products having recycled content, documentation
indicating percentages by weight of postconsumer and preconsumer recycled content.
Include statement indicating cost for each product having recycled content.
1.4 INFORMATIONAL SUBMITTALS
A. Material Certificates: For each paving material. Include statement that mixes containing
recycled materials will perform equal to mixes produced from all new materials.
1.5 QUALITY ASSURANCE
A. Manufacturer Qualifications: A paving-mix manufacturer registered with Maryland State
Highway or Prince George's County Department of Public Works and Transportation
B. Regulatory Requirements: Comply with materials, workmanship, and other applicable
requirements of Maryland State Highway as amended by Prince George's County Department
of Public Works and Transportation.
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Towne Square at Suitland Federal Center Fine Grading & Infrastructure Construction
Phases 1B/1C/2
PART 2 - PRODUCTS
2.1 AGGREGATES
A. Coarse Aggregate: ASTM D 692/D 692M, sound; angular crushed stone, crushed gravel, or
cured, crushed blast-furnace slag.
B. Fine Aggregate: ASTM D 1073, sharp-edged natural sand or sand prepared from stone, gravel,
cured blast-furnace slag, or combinations thereof.
C. Mineral Filler: ASTM D 242/D 242M, rock or slag dust, hydraulic cement, or other inert material.
2.2 ASPHALT MATERIALS
A. Asphalt Binder: PG 64-22 or PG 70-22.
B. Tack Coat: ASTM D 977 emulsified asphalt, or ASTM D 2397 cationic emulsified asphalt, slow
setting, diluted in water, of suitable grade and consistency for application.
2.3 AUXILIARY MATERIALS
A. Recycled Materials for Hot-Mix Asphalt Mixes: Reclaimed asphalt pavement; reclaimed,
unbound-aggregate base material; and recycled tires, asphalt shingles, or glass from sources
and gradations that have performed satisfactorily in previous installations, equal to performance
of required hot-mix asphalt paving produced from all new materials.
B. Herbicide: Commercial chemical for weed control, registered by the EPA, and not classified as
"restricted use" for locations and conditions of application. Provide in granular, liquid, or
wettable powder form.
2.4 MIXES
A. Hot-Mix Asphalt: See requirements of Maryland State Highway as amended by Prince George's
County Department of Public Works and Transportation.
PART 3 - EXECUTION
3.1 COLD MILLING
A. Clean existing pavement surface of loose and deleterious material immediately before cold
milling. Remove existing asphalt pavement by cold milling to grades and cross sections
indicated.
1. Mill to a depth of 2 inches.
2. Patch surface depressions deeper than 1 inch after milling, before wearing course is laid.
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Towne Square at Suitland Federal Center Fine Grading & Infrastructure Construction
Phases 1B/1C/2
3.2 PATCHING
A. Asphalt Pavement: Saw cut perimeter of patch and excavate existing pavement section to
sound base. Excavate rectangular or trapezoidal patches, extending 12 inches into perimeter of
adjacent sound pavement, unless otherwise indicated. Cut excavation faces vertically. Remove
excavated material. Recompact existing unbound-aggregate base course to form new
subgrade.
B. Portland Cement Concrete Pavement: Break cracked slabs and roll as required to reseat
concrete pieces firmly.
1. Remove disintegrated or badly cracked pavement. Excavate rectangular or trapezoidal
patches, extending into perimeter of adjacent sound pavement, unless otherwise
indicated. Cut excavation faces vertically. Recompact existing unbound-aggregate base
course to form new subgrade.
C. Tack Coat: Before placing patch material, apply tack coat uniformly to vertical asphalt surfaces
abutting the patch. Apply at a rate of 0.05 to 0.15 gal./sq. yd.
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.
D. Placing Patch Material: Fill excavated pavement areas with hot-mix asphalt base mix for full
thickness of patch and, while still hot, compact flush with adjacent surface.
3.3 SURFACE PREPARATION
A. General: Immediately before placing asphalt materials, remove loose and deleterious material
from substrate surfaces. Ensure that prepared subgrade is ready to receive paving.
B. Proof-roll subgrade below pavements with heavy pneumatic-tired equipment to identify soft
pockets and areas of excess yielding. Do not proof-roll wet or saturated subgrades.
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.
D. Tack Coat: Apply uniformly to surfaces of existing pavement at a rate of 0.05 to 0.15 gal./sq. yd.
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.
3.4 PLACING HOT-MIX ASPHALT
A. Machine place hot-mix asphalt on prepared surface, spread uniformly, and strike off. Place
asphalt mix by hand in areas inaccessible to equipment in a manner that prevents segregation
of mix. Place each course to required grade, cross section, and thickness when compacted.
1. Spread mix at a minimum temperature of 250 deg F.
2. Regulate paver machine speed to obtain smooth, continuous surface free of pulls and
tears in asphalt-paving mat.
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Towne Square at Suitland Federal Center Fine Grading & Infrastructure Construction
Phases 1B/1C/2
B. Place paving in consecutive strips not less than 10 feet 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.
3.5 JOINTS
A. Construct joints to ensure a continuous bond between adjoining paving sections. Construct
joints free of depressions, with same texture and smoothness as other sections of hot-mix
asphalt course.
1. Clean contact surfaces and apply tack coat to joints.
2. Offset longitudinal joints, in successive courses, a minimum of 6 inches.
3. Offset transverse joints, in successive courses, a minimum of 24 inches.
4. Construct transverse joints at each point where paver ends a day's work and resumes
work at a subsequent time. Construct these joints using either "bulkhead" or "papered"
method according to AI MS-22, for both "Ending a Lane" and "Resumption of Paving
Operations."
3.6 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 with vibratory-plate
compactors in areas inaccessible to rollers.
1. Complete compaction before mix temperature cools to 185 deg F.
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 or greater than 96 percent.
D. Finish Rolling: Finish roll paved surfaces to remove roller marks while hot-mix asphalt is still
warm.
E. Edge Shaping: While surface is being compacted and finished, trim edges of pavement to
proper alignment. Bevel edges while asphalt is still hot; compact thoroughly.
F. Protection: After final rolling, do not permit vehicular traffic on pavement until it has cooled and
hardened.
G. Erect barricades to protect paving from traffic until mixture has cooled enough not to become
marked.
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Phases 1B/1C/2
3.7 INSTALLATION TOLERANCES
A. Pavement Thickness: Compact each course to produce the thickness indicated within the
following tolerances:
1. Base Course: Plus or minus 1/2 inch.
2. Surface Course: Plus 1/4 inch.
B. Pavement Surface Smoothness: Compact each course to produce a surface smoothness within
the following tolerances as determined by using a 10-foot straightedge applied transversely or
longitudinally to paved areas:
1. Base Course: 1/4 inch.
2. Surface Course: 1/8 inch.
3. Crowned Surfaces: Test with crowned template centered and at right angle to crown.
Maximum allowable variance from template is 1/4 inch.
3.8 FIELD QUALITY CONTROL
A. Testing Agency: Contractor will engage a qualified testing agency to perform tests and
inspections.
B. Replace and compact hot-mix asphalt where core tests were taken.
C. Remove and replace or install additional hot-mix asphalt where test results or measurements
indicate that it does not comply with specified requirements.
3.9 WASTE HANDLING
A. General: Handle asphalt-paving waste according to approved waste management plan.
END OF SECTION
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