SECTION 010000 - DP&R SPEC TEMPLATE - Denver



SECTION 32 12 16 ASPHALT PAVEMENT

GENERAL

1. RELATED DOCUMENTS

A. Contract Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 01 Specification Sections, apply to this Section.

B. Related Report Documentation

***Edit list of applicable documents***

1.

2. City and County of Denver - Regulated Asbestos Contaminated Soil Standard Operating Procedure (RACS SOP), Denver Department of Public Health and Environment (DDPHE) – Environmental Quality Division, May 2, 2019 (see Appendix).

3. [City and County of Denver – Standard Materials Management Plan (MMP), Denver Department of Public Health and Environment (DDPHE) – Environmental Quality Division, November 13, 2019 (see Appendix).]

4. City and County of Denver – Guidance for Reuse of Soil on City Projects, Denver Department of Environmental Health – Environmental Quality Division, October 5, 2017 (see Appendix).

2. SUMMARY

A. This Section includes requirements for the following:

1. Constructing one or more surface courses composed of a mixture of aggregate, filler if required, and bituminous material, placed on a prepared base.

2. Asphalt surface treatments.

B. Related Sections: [REMOVE ANY OF THE SECTIONS BELOW THAT DO NOT APPLY]

1. Division 01 Section “Layout of Work and Surveys”.

2. Division 01 Section “Contractor Quality Control”.

3. Division 01 Section “Tree Retention and Protection”.

4. Division 01 Section “Erosion and Sedimentation Control”.

5. Division 01 Section “Material and Equipment”.

6. Division 31 Section “Earth Moving”.

7. Division 31 Section “Excavation and Backfilling of Trenches”.

8. Division 32 Section “Aggregate Base Course”.

9. Division 32 Section “Concrete Walks, Curbs and Miscellaneous Flatwork”.

10. Division 32 Section “Pavement Markings”.

11. Division 32 Section “Irrigation Systems”.

12. Division 32 Section “Soil Preparation”.

13. Division 32 Section "Topsoil”.

14. Division 32 Section “Turfgrass Seeding”.

15. Division 32 Section “Native Seeding”.

16. Division 32 Section “Sodding”.

3. REFERENCES

A. All references below shall be from the most current edition.

B. Colorado Department of Transportation (CDOT) Construction Specifications.

1. Division 400: Pavements, Sections 401 403 406,407,408, 409, 411, and 420.

2. Division 700: Materials, Sections 703 and 712.

C. Colorado Department of Transportation (CDOT) Field Materials Manual for field testing.

D. United States Department of Justice – Americans with Disabilities Act (ADA) Standards for Accessible Design, latest edition.

4. QUALITY CONTROL

A. Pre-Construction Conference: Conduct the conference at the Project site or at a location approved by the Project Manager.

1. Review methods and procedures related to hot-mix asphalt paving, including, but not limited to the following:

a. Proposed sources of paving materials, including capabilities and location of plant that will manufacture hot-mix asphalt.

b. Condition of subgrade and preparatory work.

c. Requirements for protecting paving work, including restriction of traffic during installation period and for remainder of construction period.

d. Finalize construction schedule and verify availability of materials, Installer's personnel, equipment, and facilities needed to make progress and avoid delays.

B. Installer Qualifications: Experience on projects of a similar scope and scale successfully completed within the past five (5) years.

C. Testing: The Contractor is responsible for Quality Control testing, including workmanship and materials furnished by their subcontractors and suppliers.

1. Testing shall be provided through a third-party testing agency.

2. Shall be per Colorado Department of Transportation requirements.

3. Inspection or testing does not relieve the Contractor of his responsibility to perform the Work in accordance with the Contract Documents.

4. Contractor is responsible for proof rolling and or testing of all sub-grade prior to placement of Aggregate Base Course. The Contractor shall verbally or in writing inform the Project Manager the day of any failed or passed tests.

5. The Project Manager shall be notified a minimum of forty-eight (48) hours prior to the dates of asphalt placement and testing.

6. Contractor shall provide written test results within forty-eight (48) hours of receiving results from the testing agency.

7. Should a test result come back as failed, the Contractor is responsible for removal, disposal, and replacement of failed sections until the Specifications have been met. This work shall be completed at no additional cost to the City.

8. City reserves the right to provide Quality Assurance testing at any time during the project.

5. SUBMITTALS

A. See Division 01 Section “Submittals” for submittal requirements.

B. Installer Qualification Data: Submit Installer qualifications and experience on projects, including reference contact information.

C. Mix Designs: Submit substantiating data for each asphalt mix design specified for use to the Project Manager not less than four (4) weeks prior to first asphalt placement. Mix design data sheet shall not be more than one (1) year old from the submittal date. Data for each mix shall, as a minimum, include the following:

1. Mix identification designation (unique for each mix submitted).

2. Statement of intended use for each mix.

3. Mix proportions.

4. Aggregates

D. Test Reports: Submit test reports from the third-party testing agency.

E. Record of Work: Submit a final record of asphalt placement as outlined in Part 3 – Execution.

F. [Samples for Verification: For the following products, in manufacturer's standard sizes unless otherwise indicated:] [Remove if not applicable]

***edit required product sample list in subparagraphs below***

1.

2. [Each type and color of preformed traffic-calming device.]

3. [Each pattern and color of imprinted asphalt [ and precut marking material].]

6. PROJECT CONDITIONS

A. Refer to Colorado Department of Transportation (CDOT) Construction Specifications for site requirements for installation.

PRODUCTS

1. ASPHALT MIX

A. Refer to the Denver Right of Way Services approved materials list of pre-approved asphalt mixes at the following website:

1.

B. Refer to the table below for aggregate gradation, minimum lift requirements, and uses.

|Aggregate Gradation |Minimum Lift Thickness |Use |

|[SX (Fines)] |[1”] |[Preventative maintenance, thin lift overlays, surface |

| | |mix] |

|SX (1/2”) |1 ½” |Surface mix |

|S (3/4”) |2 ¼” |Lower mix |

2. AGGREGATE BASE COURSE

A. See Division 32 Section “Aggregate Base Course and Colorado Department of Transportation Construction Specifications, Division 700, Section 703 Aggregate for Bases.

3. [GEOTEXTILE]

A. [See Colorado Department of Transportation Construction Specifications, Division 700, Section 712 for Geosynthetics and Geotextiles.]

4. [AUXILLIARY MATERIALS]

***Retain paragraph below if wheel stops are required. Revise concrete strength or dimensions of wheel stops in first paragraph to suit Project.***

A.

1. [Dowels: Galvanized steel, 3/4-inch diameter, 10-inch minimum length.]

B. [Preformed Traffic Calming Devices:]

***Retain this article if preformed traffic-calming devices are required. Copy paragraph below and re-edit for each product. Insert number to complete drawing designation. Use these designations on Drawings to identify each product***

1.

***Retain one of first two subparagraphs below. Retain first for speed bumps and second for speed humps and speed cushions***

a.

b. [Size: Modular assemblies three-inches (3”) high by twelve feet (12’) in overall width] >, with overall length as dimensioned on Contract Drawings.]

***In first subparagraph below, second hardware option is limited to asphalt where drilling holes is permitted***

c.

EXECUTION

1. EXAMINATION

A. Verify that subgrade is dry and in suitable condition to begin 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.

1. Completely proof-roll subgrade in one direction, repeating proof-rolling in direction perpendicular to first direction. Limit vehicle speed to 3 mph.

2. Proof roll with a loaded 10-wheel, tandem-axle dump truck weighing not less than fifteen (15) tons.

3. Excavate soft spots, unsatisfactory soils, and areas of excessive pumping or rutting, as determined by the Project Manager, and replace with compacted backfill or fill as directed.

C. Proceed with paving only after unsatisfactory conditions have been corrected.

***Retain paragraph below if imprinted asphalt paving is required.***

2.

A. Record of Work: The Contractor shall keep a record listing the time and date of placement of all asphalt materials. Such record shall be kept until the completion of the project and shall be available to the Project Manager for examination at any time.

B. Regulatory Requirements: Comply with materials, workmanship, and other applicable requirements of Colorado Department of Transportation for asphalt paving work.

C. Tolerances: Comply with tolerances in the Contract Drawings and as follows:

1. Elevation and Cross-slope: In conformance with grading plans and Americans with Disabilities Act (ADA).

3. ASPHALT PAVEMENTS

A. Pavement sections shall be installed in accordance to the Project geotechnical report and Colorado Department of Transportation.

1. [Parking Lot Asphalt Pavement:]

a. [Sub-grade shall be reconditioned to a minimum depth of 8-inches (8”) or as required per the geotechnical data, whichever is greater. The sub-grade shall be moisture conditioned and compacted to ninety-five percent (95%) Standard Proctor.]

b. [Base course shall be a minimum of six-inches (6”) thick, moisture conditioned, and compacted to ninety-five percent (95%) Standard Proctor.]

c. [Parking areas shall have a minimum asphalt thickness of five inches (5”).]

d. [Total thickness of pavement section shall be a minimum of eleven inches (11”).]

2. [Main Drive Aisles Asphalt Pavement:]

a. [Sub-grade shall be reconditioned to a minimum depth of 8-inches (8”) or as required per the geotechnical data, whichever is greater. The sub-grade shall be moisture conditioned and compacted to ninety-five percent (95%) Standard Proctor.]

***check geotech report to verify base course requirement.***

b.

c. [Main drive aisles shall have a minimum asphalt thickness of six inches (6”).]

d. [Total thickness of pavement section shall be a minimum of twelve inches (12”).]

3. [Pedestrian Walk Asphalt Pavement:]

a. [Sub-grade shall be reconditioned to a minimum depth of eight-inches (8”) or as required per the geotechnical data, whichever is greater. The sub-grade shall be moisture conditioned and compacted to ninety-five percent (95%) Standard Proctor.]

b. [If required by Geotech and shown on Contract Drawings.] [Base course shall be a minimum six-inches (6”) thick, moisture conditioned and compacted to ninety-five percent (95%) Standard Proctor.]

c. [Asphalt pedestrian walkways shall have a minimum asphalt thickness of four-inches (4”), installed in two (2) equal lifts.]

***Revise if no base course.***

d.

B. Pavement shall be installed to have positive drainage.

4. [PAVING GEOTEXTILE INSTALLATION]

***Retain this article if using paving geotextile over existing hot-mix asphalt pavement. Retain embedment material from three options in first paragraph below.***

A.

B. [Place paving geotextile promptly according to manufacturer's written instructions. Broom or roll geotextile smooth and free of wrinkles and folds. Overlap longitudinal joints four inches (4”) and transverse joints six inches (6”).]

1. [Protect paving geotextile from traffic and other damage and place hot-mix asphalt paving overlay the same day.]

5. [ASPHALT TRAFFIC-CALMING DEVICES]

***Retain this article only for site-formed, asphalt traffic-calming devices. Retain tolerance or revise to suit Project***

A.

1. [Tack Coat Application: Apply uniformly to surfaces of existing pavement at a rate of five one-hundredths (0.05) to fifteen one-hundredths (0.15) gal./sq. yd.]

***Revise first subparagraph below to insert designations of state or local DOT if mixes are different***

2.

3. [Before installation, mill pavement that will be in contact with bottom of traffic-calming device. Mill to a depth of one inch (1”) from top of pavement to a clean, rough profile.]

B. [Place hot-mix asphalt to cross section indicated, by machine or by hand in wood or metal forms. Tamp hand-placed materials and screed to smooth finish. Remove forms after hot-mix asphalt has cooled.]

6. [WHEEL STOPS]

***Retain this article if wheel stops are required.***

A.

B. [Securely attach wheel stops to pavement with not less than two (2) 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.]

7. [PREFORMED TRAFFIC-CALMING DEVICES]

***Retain this article if preformed traffic-calming devices are required.***

A.

B. [Securely attach preformed speed [bumps] [humps] [cushions] to pavement with hardware spaced as recommended by manufacturer for heavy traffic. Recess head of hardware beneath top surface.]

8. ASPHALT EDGE TREATMENT AND BACKFILLING

A. See Division 32 Section “Soil Preparation”.

9. CLEANING

A. Perform cleaning during installation of the Work and upon completion of the Work. Remove all excess materials, debris, and equipment from site. Repair any damage resulting from installation of asphalt pavement.

B. Sweep and wash paving not more than two (2) days prior to the date scheduled for Substantial Completion inspections.

10. PROTECTION

A. Restrict vehicular and pedestrian traffic from asphalt pavement until it has been fully cured. Erect temporary fencing or barricades and warning signs as required or directed by the Project Manager at no additional cost to the City.

11. ACCEPTANCE

A. Asphalt work shall meet the requirements of this specification.

MEASUREMENT AND PAYMENT

1. MEASURMENT [Consultant to select A or B]

A. Measurement will be based on the percentage complete for the lump sum contract amount for Asphalt Pavement.

A. Measurement will be made by the contract unit specified for Asphalt Pavement.  Measurement shall include the actual number of units of specified material(s) placed and accepted at the locations shown on the Contract Drawings, or as directed by the Project Manager, and in accordance with the Specifications.

2. PAYMENT

B. Payment will be made at the [contract unit] [lump sum contract] price, and shall include required materials, transportation, equipment, labor, excavation, sub-grade preparation, base course placement, asphalt compaction, testing, stockpiling, disposing, hauling off, watering, dust control, erosion and sediment control, as required in accordance with the Contract Drawings and Specifications.

***REVISE AS NEEDED, AND AS DIRECTED BY THE PROJECT MANAGER. ***

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