32 1219 Asphalt Overlay, 04-2025.pdf

ALMONT COMMUNITY SCHOOLS

SECTION 32 1219

ASPHALT OVERLAY

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SECTION 32 1219 – ASPHALT OVERLAY

PART 1 - GENERAL

1.1 SUMMARY

A. This Section is a part of the entire set of Contract Documents and shall be coordinated with the applicable provisions of the other parts.

1.2 SCOPE

A. The work under this section of specifications shall include the furnishing of all labor, materials and equipment necessary to produce, place, spread, compact and finish to proper grade and cross section all plant mix bituminous pavement as shown on the drawings and as specified herein.

1.3 QUALITY ASSURANCE

A. Reference Standards:

1. Michigan Department of Transportation

a. All work done under this section of the specifications except as amended herein, shall be in accordance with current edition of the Michigan Department of Transportation Standard

Specifications for Highway Construction, referred to hereafter as the MDOT Specifications.

Where notes in this specification section differ from the MDOT standards, the MDOT standards shall govern.

2. National Asphalt Paving Association (NAPA)

3. Asphalt Institute (AI)

4. National Highway Institute (NHI)

5. American Association of State Highway and Transportation Officials (AASHTO)

6. American Sports Builders Association (ASBA)

7. National Federation of State High School Association (NFSHSA)

B. Manufacturer Qualifications:

1. Manufacturer shall be a paving-mix manufacturer registered with and Prequalified by MDOT.

C. Testing Agency Qualifications:

1. Qualified according to the AASHTO Accreditation Program.

D. Acceptability of the Work:

1. Grade: Grade conformance tests shall be conducted on both the leveling and wearing courses.

The entire surface shall have positive drainage, 1% lateral inclination and 0.1% in running direction.

2. Planarity: After completion of the finish rolling operations on each course, the compacted surface shall be tested with a 10’ straightedge. Measurements shall be made perpendicular to and across all mats at a distance not to exceed 25 feet. The maximum allowable planarity deviation within a pass shall be no more than 1/8” in 10’ when measured in any direction.

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1.4 SUBMITTALS

A. Asphalt Paving Contractor shall submit mix designs for approval prior to placement which includes the exact proportions of bituminous material and mineral filler.

B. Updated mix design shall be provided if changes are made at the asphalt plant prior to or during paving.

C. Mix design submittals shall identify aggregate blend components and sources, any recycled materials, component gradations, aggregate properties, and target job mix formula. Mix design submittals shall identify volumetric properties of compacted mixtures including Gmm, Gmb, Pb, VMA, VFA, and air voids at design asphalt contents.

1.5 MEASURE AND PAVEMENT

A. Pavement courses are measured by the square yard and paid as a part of the lump sum price as per the proposal form.

B. Tack coat courses for overlay of existing and between lifts of new asphalt shall be incidental to the cost of asphalt installation.

PART 2 - PRODUCTS

2.1 PLANT MIX

A. Asphalt Overlay: The bituminous plant mix base course shall meet the requirements of MDOT

Division 5 – Hot Mix Asphalt Specifications. The specific mix and cross sections are as follows:

1. Thickness: Not less than 1 ½ inches when compacted

2. Liquid Asphalt/Bitumen: 4% ~ 6% by weight (+1½%)

3. Asphalt Binder Grade: (PG 58-28)

4. Target Air Void = 3.5%

5. Aggregate Type: Crushed limestone and manufactured sand. Slag, iron pyrites, natural aggregates, and dust balls are unacceptable.

6. No Recycled Asphalt Pavement (RAP), Recycled Asphalt Shingles (RAS), or crushed concrete.

7. MDOT Mix: 5E1

Aggregate Screen Size Percent Passing

1/2” 100

3/8” 90-100

No. 4 ≤90

No. 8 47-67

No. 30 --

No. 200 2.0-10.0

Percent Crushed >10%

B. The Asphalt Paving Contractor shall submit a job mix formula prepared by an independent testing

32 1219 - Page 3 of 6 laboratory, including the exact proportions of bituminous material and mineral filler. The Asphalt

Paving Contractor shall pay for all samples, reports and tests required to develop the job mix.

C. No bituminous surface shall be placed until approval of the job mix design by the Lead Contractor

2.2 BITUMINOUS MATERIAL

A. All materials are to conform to the State Highway Department standard specifications for Surface and Binder Course.

B. The aggregate shall conform to the requirements of 3/8” and down stone size that is one hundred percent (100%) crushed. No sand shall be added. Fine content of not more than twelve percent

(12%). The asphalt cement shall be not less than six percent (6%) by weight of the total mix.

Penetration shall not be less than eighty-five (85) to one hundred (100), or Ac-10.

C. Tack coat shall be applied between each lift of asphalt of ss-1h at the rate of one tenth (0.1) gallon, per square yard.

D. Tolerance of the finished asphalt surface shall conform to the standard of the American Sports

Builders Association and according to the rules of USTA, which are:

“The finished surface of the leveling course shall not vary from the specified grade more than one-eighth inch (1/8”) in ten feet when measured in any direction.”

E. After the asphalt has been completed, this Asphalt Paving Contractor shall notify the Lead

Contractor and Owner for acceptance. The Surface Contractor shall accept this work prior to a start of the final surface application.

PART 3 - EXECUTION

3.1 LIMITATIONS OF OPERATIONS

A. Bituminous tack coat shall be applied only when surface and weather conditions are favorable.

B. Bituminous plant mix shall be placed only during daylight hours when the temperature of a shaded portion of the base is 40F. or higher and when the surface upon which it is to be constructed is dry.

C. The entire wearing course shall be installed in a single day to avoid cold joints. If rain is expected, contractor shall reschedule installation

3.2 SUB-GRADE AND BASE COURSE PREPARATION

A. Prepare sub-grade and aggregate base course in accordance with these specifications.

B. At the time of applying bituminous material, the sub-grade surface shall be dry and clean, and all necessary repairs or reconditioning work shall have been completed.

C. All objectionable foreign matter on the surface shall be removed and disposed by the Asphalt

Paving Contractor.

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3.3 BITUMINOUS TACK COAT

A. Bituminous tack coat shall be applied at a rate of 0.1 gallons per square yard to existing bituminous surfaces and to successive plant mix surfaces. The tack coat may be waived by the Landscape

Architect when successive plant mix courses are to be placed during one day's operation.

B. The bituminous tack coat shall be applied uniformly to the clean, dry surface with a pressure distributor. Pools of bituminous material shall not be allowed to remain on the surface. The tack coat material shall be applied far enough ahead of the paving operation to allow it to cure before placing the subsequent plant mix bituminous material.

3.4 TEMPERATURE

A. The temperature of bituminous material at the time of application shall be as approved by the

Landscape Architect within the limits specified below.

SS-1h 105-180 degrees F.

Plant Mix 270-300 degrees F.

B. The Lead Contractor may reject any load of plant mix bituminous material whose temperature is outside the temperature limits identified in 3.4A

3.5 PLACEMENT AND COMPACTION

A. Paving operations shall provide a mat that is smooth, dense and of the proper thickness, slope and planarity. The plant mix bituminous material shall be compacted to 92 - 98% of Theoretical

Maximum Density (Gmm).

B. Transverse joints shall be off set a minimum of 24”.

C. In placing each succeeding pass after the initial one, the screed of the paver should be set so that it overlaps the preceding pass by 2” and be sufficiently high so that when compacted, a smooth joint is produced. Prior to pinching the joint, the excess material shall be pushed onto the edge of the new pass with a lute. Excess material shall be removed from the pass.

D. Skin patching of the wearing course shall only be done with materials acceptable to the surfacing contractor.

E. 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. Surface Course: 1/8 inch

2. Crowned Surfaces: Test with crowned template centered and at a right angle to crown.

Maximum allowable variance from template is ¼ inch.

3.6 BITUMINOUS PAVING

A. After preparation of the surface, install 1 ½” of wearing asphalt materials.

B. Each asphalt lift shall be installed using automated laser grade control, self-propelled paving equipment, with dual-slope capabilities.

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C. Edge Shaping: While surface is being compacted and finished, trim edges of pavement for proper alignment, bevel edges of asphalt and compact thoroughly.

D. The plant mix bituminous material shall be compacted to 92- 98% of Theoretical Maximum Density

(Gmm).

E. Plant mix shall be placed and compacted in accordance with current MDOT Guidelines, Division

No. 5 - Hot-Mix Asphalt Pavements and Surface Treatments. The initial contact with the hot mixture leveling course shall be made by the power or driving roll of the steel roller, weighing not less than six (6) tons. The finish surface of the leveling course shall not vary more than 1/4” in 10 feet when measured in any direction. The finish surface of the wearing course shall not vary more than 1/8” in 10 feet when measured in any direction.

F. HMA mixtures shall be produced to test as closely as possible to the job mix formula identified on the approved mix design submittal for each mixture and shall meet the Uniformity Tolerance

Limits identified in Table 1. Mixtures tested that fall outside of Range 1 tolerances shall be adjusted as necessary to comply with Range 1 tolerances. Mixtures tested that fall outside of

Range 2 tolerances shall be subject to rejected at the discretion of the Architect.

3.7 TESTS AND SAMPLES

A. At the direction of the Lead Contractor, the Asphalt Paving Contractor shall cut samples from any course or finished pavement not to exceed five (5) in number from any days run for tests of density and composition. These samples shall be taken at points designated by the Lead Contractor by sawing with a power driven masonry saw or diamond core drill. Samples shall be sufficiently large to meet the needs of the testing laboratory.

B. The Owner will hire an independent testing laboratory to perform field density testing with a nuclear density gage, a Correlated Pavement Quality Indicator, or PaveTracker (non-nuclear) to verify that the specified density requirements are being met.

C. The surface from which samples are taken shall be restored by the Asphalt Paving Contractor not later than the next succeeding day of plant operation.

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D. All test results will be available to the Contractor.

E. All testing samples will be paid for in accordance with these specifications.

F. Asphalt paving contractor shall power-wash asphalt prior to installation of tennis court or all weather track surface. Contractor shall flood the asphalt to identify all potential “Bird Bath” areas prior to surface application. Bird bath areas will be repaired as directed by the Landscape Architect.

END OF SECTION 32 1219