HomeMy Public PortalAbout110_032_Jones Paving Exhibit - OGI Spec Section 415 5 2011 (2) Revised:May 17,2011
DEPARTMENT OF TRANSPORTATION
STATE OF GEORGIA
Section 415—Asphaltic Concrete Open Graded Interlayer
415.1 General Description
This work includes constructing a bituminous plant produced Asphaltic Concrete Open Interlayer over the existing roadway
surface. The mixture shall serve as asphaltic concrete leveling over irregular surfaces and provide mitigation for reflective
cracking prior to the placement of the final surface pavement. The mixture shall conform to the lines, grades, thicknesses,
typical sections and cross sections shown on the Plans or established by the Engineer.
This section includes the requirements for Asphaltic Concrete Open Graded Interlayer mixtures regardless of the gradation of
the aggregates, type and amount of bituminous material, or pavement use. Follow the requirements in Section 400, and
Section 828 for production and placement, materials, equipment, and acceptance plans except as noted or modified in this
Specification.
Acceptance of work is on a lot-to-lot basis according to the requirements of this Section, Section 400 and Section 106.
415.1.01 Definitions
Asphaltic Concrete Open Graded Interlayer: an open graded mixture placed at a lift thickness that yields stone on stone
contact that provides in-place air void content in excess of 20% to mitigate existing cracking within asphaltic concrete
pavements.
415.1.02 Related References
A. Standard Specifications
Section 400–Hot Mix Asphaltic Concrete Construction
Section 800-Coarse Aggregate
Section 802–Aggregate for Asphaltic Concrete
Section 820–Asphalt Cement
Section 828-Hot Mix Asphaltic Concrete Mixtures
A. Standard Specifications
Section 106—Control of Materials
Section 109 Measurement and Payment
Section 152—Field Laboratory Building
Section 413—Bituminous Tack Coat
Section 802—Coarse Aggregate for Asphaltic Concrete
Section 828—Hot Mix Asphaltic Concrete Mixtures
B. Referenced Documents
AASHTO T 209
AASHTO T 202
AASHTO T 49
AASHTO T 315
Department of Transportation Standard Operating Procedure(SOP)27,"Quality Assurance for Hot Mix Asphaltic
Concrete Plants in Georgia"
Department of Transportation Standard Operating Procedure(SOP) 15
Department of Transportation Standard Operation Procedure(SOP)40
GDT 38
GDT 73
GDT 83
GDT 119
GDT 125
GDT 126
GSP 15
GSP 21
QPL 1
QPL 2
QPL 7
QPL 26
QPL 39
QPL 41
QPL 45
415.1.03 Submittals
A. Invoices
Furnish formal written invoices from a supplier for all materials used in production of HMA when requested by
Department. Show the following on the Bill of Lading:
• Date shipped
• Quantity in tons(megagrams)
• Included with or without additives(for asphalt cement)
Purchase asphaltic cement directly from a supplier listed on Qualified Products List 7 and provide copies of Bill of
Lading at the Department's request.
B. Paving Plan
Before starting asphaltic concrete construction,submit a written paving plan to the Engineer for approval.Include the
following on the paving plan:
• Proposed starting date
• Location of plant(s)
• Rate of production
• Average haul distance(s)
• Number of haul trucks
• Paver speed feet(meter)/minute for each placement operation
• Mat width for each placement operation
• Number and type of rollers for each placement operation
• Sketch of the typical section showing the paving sequence for each placement operation
• Electronic controls used for each placement operation
• Temporary pavement marking plan
If staged construction is designated in the Plans or contract,provide a paving plan for each construction stage.
If segregation is detected,submit a written plan of measures and actions to prevent segregation. Work will not continue
until the plan is submitted to and approved by the Department.
C. Job Mix Formula
Submit to the Engineer a written job mix formula proposed for each mixture type to be used based on an approved mix
design.Furnish the following information for each mix:
• Specific project for which the mixture will be used
• Source and description of the materials to be used
• Mixture I.D.Number
• Proportions of the raw materials to be combined in the paving mixture
• Single percentage of the combined mineral aggregates passing each specified sieve
• Single percentage of asphalt by weight of the total mix to be incorporated in the completed mixture
• Single temperature at which to discharge the mixture from the plant
• Theoretical specific gravity of the mixture at the designated asphalt content
• Name of the person or agency responsible for quality control of the mixture during production
Do the following to have the formulas approved in accordance with SOP 40"Approval of Contractor Job Mix Formulas"
and to ensure their quality:
1. Submit proposed job mix formulas for review at least two weeks before beginning the mixing operations.
2. Do not start hot mix asphaltic concrete work until the Engineer has approved a job mix formula for the mixture to be
used.No mixture will be accepted until the Engineer has given approval.
3. Provide mix designs for all SMA, Superpave and 4.75 mm mixes to be used.The Depaitment will provide mix
design results for other mixes to be used.
4. After a job mix formula has been approved,assume responsibility for the quality control of the mixtures supplied to
the Department according to Subsection 106.01,"Source of Supply and Quantity of Materials."
D. Quality Control Program
Submit a Quality Control Plan to the Office of Materials and Research for approval. The Quality Control Program will
be included as part of the certification in the annual plant inspection report.
415.2 Materials
The requirements established in Section 400 are to be followed for Asphaltic Concrete Open Interlayer production and
placement,materials,equipment,and acceptance plans except as noted or modified in this Specification.
Ensure that materials comply with the specifications listed in Table 1.
Table 1—Materials Specifications
Material Subsection
Asphalt Cement, Grade Specified 820.2
Coarse Aggregates for Asphaltic Concrete 802.2.02
Fine Aggregates for Asphaltic Concrete 802.2.01
Mineral Filler 883.1
Heat Stable Anti-Stripping Additive 831.2.04
Hydrated Lime 882.2.03
Silicone Fluid (When approved by the Office of Materials and Research) 831.2.05
Bituminous Tack Coat: PG 58-22, PG 64-22, PG 67-22 820.2
Hot Mix Asphaltic Concrete Mixtures 828
415.2.01 Mix Design Requirements
The Open Graded Mixture shall be formulated to contain approximately 20 to 25 percent in-place air voids after compaction.
Use approved mixtures that meet the following mixture control tolerances and design criteria:
Table 1 — Asphaltic Concrete Open Graded Interlayer Mixture Design and Control
Mixture Design Gradation Limits, % Passing
Sieve Size Control
Tolerance, % Open Graded Interlayer
3/4 in (19 mm)sieve ±0.0 100
1/2 in (12.5 mm)sieve ±6.1 80- 100
3/8 in (9.5 mm)sieve ±5.6 40-65
No.4 (4.75 mm)sieve ±5.7 10-25
No. 8 (2.36 mm)sieve ±4.6 2-8
No. 200 (75 pm)sieve ±2.0 1 -4
Range for%AC ±0.4 4.00—5.00
Class of stone (Section 800) "A"only
Drain-down (AASHTO T305), % <0.3
Design optimum air voids (%) 22%±1
Control Sieves used in Acceptance Schedule 3/8 in., No. 8(9.5 mm, 2.36 mm )and Asphalt Cement
Notes:
1. Use only PG 67-22 asphalt cement(specified in Section 820).
2. Use no less than 1.0% hydrated lime regardless of aggregates group or source(s) used.
The Department will design the Open Graded Interlayer mixture. All materials and appropriate related
information (material sources, gradation and project for use) shall be furnished to the Office of Materials and
Research. Once the materials and related information has been provided, the Department shall have four
weeks to design the mixture. The Department will establish the mix design Asphalt Cement content for the mix.
415.3 Construction Requirements
The requirements established in Section 400 are to be followed for warm mix asphaltic concrete production and placement,
materials,equipment,and acceptance plans except as noted or modified in this Specification.
415.3. 01 Personnel
General Provisions 101 through 150.
415.3.02 Construction
Asphaltic concrete plants that produce mix for Department use are governed by Quality Assurance for Hot Mix Asphaltic
Concrete Plants in Georgia,Laboratory Standard Operating Procedure No. 27.
Follow requirements established in Section 400 for production and placement, materials,equipment,acceptance plans and
adjustments except as noted or modified in this Specification.
A. Apply the bituminous tack coat according to Section 413.The Engineer will determine the application rate,which
must be within the limits of 0.03 gal/yd2 to 0.05 gal/yd2.
B. The mix shall be produced and placed at a temperature of 250°F with a tolerance of±20°F.
C. Place the mix to a compacted lift thickness of 1-inch.For construction purposes,the target thickness will be
converted to spread rate based on the bulk specific gravity of the asphaltic concrete mixture being used as shown in
the following equation:
Spread rate(lbs/yd2)=t*Gmb*46.8
Where: t=Compacted lift thickness(inches)
Gmb=bulk specific gravity of the mix from the approved mix design
The spread rate shall be controlled within 10 lbs/yd2(6 kg/m2).
D. Do not place mix at air temperatures below 50°F.
E. The mix shall be compacted in a manner to achieve 20%-25%in-place air voids. Steel wheel rollers operating in
static mode only will be used to seat the lift of Asphaltic Concrete Open Graded mixture.Pneumatic tire rollers shall
not be allowed on the Asphaltic Concrete Open Graded mat.
415.4. Measurement
If the spread rate exceeds the upper limits outlined in Subsection 415.3.02.0,the mix in excess will not be paid for.If the
rate of the spread is less than the lower limit,the deficient course is subject to correction by overlaying the entire lot. The
mixture used for correcting deficient areas is paid for at the Contract Unit Price of the course being corrected and is subject to
mixture control requirements established in Table 1 —Asphaltic Concrete Open Graded Crack Relief Interlayer Mixture
Design and Control.
415.5 Payment
Asphaltic Concrete Open Graded Crack Relief Layer mix is paid for at the Contract Unit Price per ton(megagram). Payment
is full compensation for furnishing and placing materials including asphalt cement,hydrated lime,approved additives,and
for cleaning and repairing,preparing surfaces,hauling,mixing, spreading,rolling,and performing other operations to
complete the Contract Item.
Payment will be made under:
Item No.415 Asphaltic Concrete Open Graded Crack Relief Interlayer, group-blend, Per ton (megagram)
Including bituminous materials and hydrated lime
415.5.01 Adjustments
A. Materials Produced and Placed During the Adjustment Period
Follow requirements established in Section 400 for production and placement,materials,equipment,acceptance plans and
adjustments except as noted or modified in this Specification.
Asphaltic Concrete Open Graded Crack Relief Interlayer shall be granted an adjustment period for the first Lot or day,
whichever is less, produced for the Contract. A new adjustment period shall not be granted for a change of producer, mix
design or asphalt plant location. The adjustment period is provided to adjust or correct the mix and to establish the
construction procedures and sequence of operations. Test the mixture in accordance with Section 400.3.06. Maintain the
asphalt cement content and gradation within the limits provided in Table 1 — Asphaltic Concrete Open Graded Interlayer
Mixture Design and Control. The Engineer will not used these test results in the acceptance for payment decision but
production and placement operations shall cease for failure to meet mixture control tolerances established in Table 1 —
Asphaltic Concrete Open Graded Interlayer Mixture Design and Control.
415.5.02 Determine Lot Acceptance
The Engineer will accept the mixture based on visual inspection.The mixture shall be inspected for texture,segregation,
bleeding,fat spots,raveling,delamination,tearing,targeted in-place air void content and slippage areas.Remove and replace
and areas determined to be unacceptable to the Engineer.