305STOCKPILED MATERIAL

305-1.01 DESCRIPTION . Produce and place specified material at designated stockpile locations.

305-2.01 MATERIALS. Meet the materials requirements of the Section indicated in the pay item

on the bid schedule.

305-3.01 CONSTRUCTIO N REQUI REMENTS. Clear and grub the stockpile sites and dispose of

all trees, stumps, brush and debris, as provided in Section 201. Make the floor of each stockpile site uniform in cross section, compacted, and well drained. Construct the stockpiles to occupy the smallest feasible areas. Deposit the material in uniform layers or lifts not exceeding 4 feet in thickness. Avoid segregation of the various sizes of crushed stone or gravel in each stockpile. Place the material in each lift by trucks or other types of ha uling units. Only rubber tired vehicles are allowed on the stockpile. Do not stockpile from a conveyor belt. Make the completed stockpiles neat and regular in form. Make the height of the piles, or their average depth, not less than 20 feet. Make the side slopes 1- 1/2:1 or steeper.

305-4.01 METHOD OF MEASUREMENT. See Section 109, by volume in the stockpile or by

weight. No allowance will be made for settlement, swell, or shrinkage.

305-5.01 BASIS OF PA YMENT. All work involved in preparing the stockpile si te is subsidiary.

Payment will be made under: PAY ITEM Item Number Item Description Unit 305.0001.____ Stockpiled Material Section ___, Grading ___ CY 305.0002.____ Stockpiled Material Section ___, Grading ___ TON 305.0003.____ Stockpiled Material Se ction ___, Grading ___ CYVM 305.0004.____ Stockpiled Material Section ___, Grading ___ LS 114 ALASKA 2020 SECTION 306 ASPHALT TREATED BASE COURSE

306-1.01 DESCRIPTION . Construct a plant -mixed asphalt treated base (ATB) course on an

approved foundation to the lines, gr ades, and depths shown on the Plans.

306-2.01 MATERIALS. Use materials that conform to the following:

Aggregate Subsection 703- 2.03, grading D -1, except change the minimum Degradation Value to 30. Asphalt Section 702, for the type and grade shown on the bid schedule. Use PG

52-28 if no Grade is specified.

Anti-Strip As required by the approved Job Mix Design. CONSTRUCTION REQUIREMENTS

306-3.01 COMPOSITION OF MIXES. At least 15 days in advance of the production of ATB,

submit a representative 300- pound sample of the aggregate proposed for the project. Also submit a representative 3- gallon sample of the asphalt binder and a one- pint sample of the anti -strip additive proposed for use in the mix. From this information the Engineer will establish the Job Mix Design, including the maximum specific gravity (MSG). The MSG will be determined by ATM 209. When changes in the aggregate gradation or aggregate source occur, submit representative samples, in the same manner as above, for a new mix design. Use anti -strip a gents in the proportions determined by ATM 414 and included in the approved Job Mix Design. At least 70 percent of the aggregate must remain coated when tested under ATM 414.

306-3.02 WEATHER LIM ITATIONS. Do not place the asphalt mixture on a wet or frozen surface,

or when weather conditions will prevent proper handling, compacting or finishing of the mixture. Do not place the asphalt mixture unless the air temperature is above 40 °F, as measured in the shade and away from any heat sources.

306-3.03 STOCKP ILING. Aggregates may be stored in a single stockpile. Minimize segregation

and contamination.

306-3.04 Equipment.

401-3.07 or motor grader.

306-3.05 PREPARATION OF ASPHALT. Provide a continuous supply of asphalt binder to the

mixer at a uniform temperature, within the allowable m ixing temperature range.

306-3.06 PREPARATION OF AGGREGATE. Heat and dry the aggregate for the mix to within

±25 °F of the Mix Design temperature. Adjust dryer flames to avoid damage to aggregate and to avoid soot on the aggregate.

306-3.07 MIXING. Mix AT B materials per Subsection 401- 3.10. Aggregates will be accepted

based on samples taken from the combined aggregate cold feed conveyor during ATB production.