280 Page 154280 FULL DEPTH RECLAMATIOIN (FDR)
280.1DESCRIPTION
Full depth reclamation (FDR) will consist of processing and blending the asphalt mix and granular base material and placing, watering, shaping, and compacting the material to the typical section.
280.2MATERIALS
The asphalt mix and granular base material will conform to Section 884.
280.3CONSTRUCTION REQUIREMENTS
A.Equipment: 1.Recycling Equipment: The equipment will be self-propelled and capable of processing and blending the material to the depth specified in the plans. 2.Rollers: Pneumatic tired rollers will have an effective roller weight of at least 250 pounds per inch of roller width or satisfactory vibratory compaction equipment. Tires will be uniformly inflated so their air pressures will not vary by more than 5 psi. Rollers will be operated with tire pressures and wheel loads within the manufacturer’s recommended range for the size and ply of the tire being used. Steel rollers will furnish a minimum rolling weight of 275 pounds per inch of rolling width. B.Processing and Laydown: Asphalt concrete mix and granular base material will be processed in place so that a uniform blend is obtained. The material will be handled to ensure that salvaged material is not lost down the inslope. The processed material will be placed in a minimum of two lifts. The maximum lift thickness will not exceed 4 inches. The depths of the in-place asphalt concrete and granular base material may vary from what is shown in the plans. The Contractor will be responsible for interpreting the depths and including all costs to process the required depth of existing pavement and granular material. Each layer will be compacted to the required density before the next lift is placed and will be rolled until a uniform, stable surface is obtained. The final rolling of the top surface of the granular materials will embed as many loose stones as possible. The finished surface will be smooth and free from waves and the Contractor will finish the surfacing materials to within ±0.5% of the typical section cross slope. The quarter crown within any 12-foot transverse length (or actual lane width paved with a single paver pass) will not exceed 0.04 feet when measured with a straight edge, stringline, or other suitable equipment. The centerline will be finished to a transverse distance within ± 0.25 feet of the plans shown location of centerline. 280 Page 155The Contractor will conduct his operations in such a way that both lanes will be brought up even at the end of each day. C.Compaction and Density Requirements: Compaction and density requirements will be a minimum of 95% of the target dry density established by SD 219 and compacted under the following conditions: 1.Material will have a minimum of 4% moisture uniformly blended throughout the depth of the lift of material. The percent moisture may be adjusted by the Engineer. 2.A minimum of 1 test strip for each lift placed will be completed to determine the target dry density and optimum rolling sequence. The test strips will remain in place as part of the completed work. 3.The depth of the test strip lift will be representative of the project. 4.When there is a significant change in mix proportions, weather conditions, equipment, or other controlling factors the Engineer may require construction of another test strip to check target density.
280.4METHOD OF MEASUREMENT
FDR will be measured to the nearest square yard. Plans quantity will be the basis of payment, unless changes are ordered by the Engineer. Water and materials which are paid under separate items will not be measured under this item.
280.5BASIS OF PAYMENT
FDR will be paid for at the contract price per square yard inclusive of all costs for processing, blending, placing, shaping, compacting, equipment, test strips, labor, and incidentals necessary to satisfactorily complete the work. Plans quantity will be the basis of payment, unless changes are ordered by the Engineer. 320 Page 156PART C ASPHALT CONSTRUCTION 320 ASPHALT CONCRETE, GENERAL
320.1DESCRIPTION
These requirements are applicable to all types of hot mixed asphalt pavements irrespective of class, type, asphalt material, or pavement use. Exceptions to the general requirements are in the specified requirements for each class. The work consists of one or more courses of asphalt concrete mixture constructed on a prepared foundation.
320.2MATERIALS
A.Composition of Mixtures: The asphalt concrete will be composed of a mixture of aggregate, asphalt binder, additives, and approved modifiers. Unless otherwise specified in the plans, no RAP is allowed in the asphalt concrete. Aggregate fractions will be combined in proportions resulting in a mixture meeting the specified requirements. The operation of the plant will not commence until the Department’s Bituminous Engineer has established or verified a job mix formula, in writing, meeting the aggregate and mix design specification requirements for the class and type of asphalt concrete specified. The job mix formula established or verified by the Department’s Bituminous Engineer will fix a single percentage of aggregate passing each required sieve size, a single percentage of asphalt binder to be added to the aggregate, a single asphalt binder application temperature at the mixer, a single temperature at which the mixture is to be discharged from the mixer, and a single temperature at which the mixture is to be delivered to the road. The following table sets forth the tolerances for the job mix formula: Gradation, percent passing, sieve sizes 3/8 inch & larger ........................................................................................... ±7 #4 thru #40................................................................................................... ±5 #200 .......................................................................................................... ±2.0 Percent asphalt binder content ....................................................................... ±0.3 Percent hydrated lime content ...................................................................... ±0.10 Temperature of mixture when emptied from mixer ....................................... ±20°F Temperature of mixture on delivery to the road .............................. -20°F & +30°F Asphalt binder application temperature ........................................................ ±20°F Percent RAP content (if used) ............................................................................ ±5 Job mix formula tolerances for Class Q asphalt concrete will conform to Section 322. The mixture will conform within the range of tolerances established by the job mix formula for that class of asphalt concrete. Should a change in sources of materials be proposed or when unsatisfactory results are obtained, a new job mix formula will be established. Blade laid asphalt concrete mixture will consist of the fine aggregate components of the asphalt concrete class specified on the project. The job mix formula established or verified by the Department’s Bituminous Engineer will set the fines components at approximately the