321 Page 170321 ASPHALT CONCRETE – CLASS D, E, G
321.1DESCRIPTION
This work consists of constructing one or more courses of asphalt concrete on a prepared surface.
321.2MATERIALS
The materials and their use will conform to Section 320.2 .
321.3CONSTRUCTION REQUIREMENTS
The construction requirements will be as prescribed in Section 320.3 with the following modifications: A.Mix Design Specifications: Unless otherwise specified in the plans, the mix design criteria will conform to the following requirements for the class and type of asphalt concrete specified. MIX DESIGN SPECIFICATIONS MIX DESIGN PARAMETERS Class D Class E Class G % Air Voids 4.0 Min. 4.0 Min. 4.0 Min. % VMA*1 3/4 inch nominal maximum size 13.5 Min. 13.5 Min. 13.5 Min. 1/2 inch nominal maximum size 14.5 Min. 14.5 Min. 14.5 Min. Gyratory Gyrations 40 50 60 Dust/Binder Ratio (based on effective binder) 0.6-1.4 0.6-1.4 0.6-1.4 Moisture Sensitivity*2NA NA 70 Min. *1Evaluated for compliance during the mix design. If the percent passing the 1/2 inch sieve is greater than or equal to 90% the mix will be considered 1/2 inch nominal maximum size. If the percent passing the 1/2 inch sieve is less than 90% the mix will be considered 3/4 inch nominal maximum size. Mixes containing 80% or more limestone ledge rock will meet the VMA requirements of 13.0% Min. for a 3/4 inch nominal maximum size and 14.0% Min. for 1/2 inch nominal maximum size. *2Moisture sensitivity will be tested according to SD 309. Hydrated lime will be used to meet the moisture sensitivity requirement of the mix. Hydrated lime will not be required if the moisture sensitivity requirements are met without the addition of hydrated lime. Hydrated lime will be included in the dust (-#200)/binder ratio. B.Thickness: The compacted thickness of each lift will not exceed 3 inches. C.Density: The lot average minimum density requirement will be 92% of the maximum specific gravity of the test specimens prepared in the field in accordance with SD 312. The lot will contain no more than 2 tests below the specification, no more than 1 test 2% below the specification, and no test 3% or more below the specification. The compacted density of asphalt concrete will be determined according to SD 311.
321.4METHOD OF MEASUREMENT
Measurement as prescribed in Section 320.4 .
321.5BASIS OF PAYMENT
Payment as prescribed in Section 320.5 . 322 Page 171322 ASPHALT CONCRETE – CLASS Q
322.1DESCRIPTION
The work consists of constructing one or more courses of gyratory controlled QC/QA hot mixed asphalt concrete pavement on a prepared foundation.
322.2MATERIALS
Mineral aggregate will conform to the requirements of Section 322.3 . All other materials and their use will conform to Section 320.2 .
322.3CONSTRUCTION REQUIREMENTS
The construction requirements will be as prescribed in Section 320.3 with the following additional requirements: A.Laboratories: 1.Quality Control Laboratory: The Contractor will furnish and maintain a Quality Control (QC) laboratory at the plant site. The laboratory will be furnished with the necessary space, equipment, and supplies to properly perform all specified testing. The laboratory will be equipped with a gyratory compactor meeting the requirements of AASHTO T 312. The laboratory equipment will meet the requirements of the test methods contained in the Department’s Materials Manual and Materials Testing & Inspection Certification Program Manual. A copy of the equipment calibration records will be kept in the QC laboratory. The Contractor's QC laboratory will be equipped with a mechanical convection oven meeting the requirements of Section 600. The Contractor will furnish a cut off saw equipped with a diamond tipped blade. The saw is to separate the core samples to the actual lift thickness. The cores will be sawed by the Contractor to the correct lift line prior to testing the cores for density. 2.Quality Assurance Laboratory: The Contractor will also provide a separate Quality Assurance
requirements of Section 600. B.Quality Control: 1.Contractor Furnished Quality Control Program: QC for the asphalt concrete pavement is the responsibility of the Contractor. The Contractor will provide and maintain a QC program. The program will assure that all asphalt concrete materials and constructed pavement submitted for acceptance conforms to the contract requirements. The Contractor will be responsible for all asphalt concrete materials and constructed pavement, including aggregate process control and handling. The Contractor will provide at least one technician certified in Asphalt Concrete Aggregate Testing and Asphalt Concrete Hot Mix Testing for conducting the QC testing and at least one technician certified in Asphalt Concrete Roadway Inspection for roadway inspection.