ITEM 441 MARSHALL ASPHALT CONCRETE
441.01 Description. This work consists of design, production, placement, compaction and testing of
one or more courses of Marshall asphalt concrete, on a prepared foundation. The Marshall asphalt concrete consists of a mixture of graded aggregate and specified type and grad e of asphalt binder that is designed using Marshall mix design procedures and a Marshall hammer. The aggregate and asphalt binder are mixed in a central plant then spread and compacted on the prepared surface. The requirements of Items 401, 402, 403, and 440 apply with the additional requirements of this specification.
441.02 Composition. Use a PG 64-22 asphalt binder for a Type 1 Intermediate course unless RAP,
RAS, or both used according to 440.03 require a virgin binder grade change. Use a PG 64 -22 asphalt binder for a Type 2 intermediate course unless RAP and/or RAS used according to 440.03 require a virgin binder grade change. Use a PG 64 -22 asphalt binder and Type 1 surface gradation for asphalt concrete for driveways and under guardrails. TABLE 441.02-1 Asphalt Mixture Composition Property Type 1 Surface Type 1 Intermediate Type 2 Intermediate 1 1/2 inch (37.5 mm)[1] 100 1 inch (25.0 mm)[1] 95 to 100 3/4 inch (19.0 mm)[1] 85 to 100 1/2 inch (12.5 mm)[1] 100 100 65 to 85 3/8 inch (9.5 mm)[1] 90 to 100 90 to 100 No. 4 (4.75 mm)[1] 45 to 57 50 to 72 35 to 60 No. 8 (2.36 mm)[1] 30 to 45 30 to 55 25 to 48 No. 16 (1.18 mm)[1] 17 to 35 17 to 40 16 to 36 No. 30 (600 m)[1] 12 to 25 12 to 30 12 to 30 No. 50 (300 m)[1] 5 to 18 5 to 20 5 to 18 No. 100 (150 m)[1] 2 to 10 2 to 12 2 to 10 No. 200 (75 m)[1] Asphalt Binder[2] 5.8 to 10.0 5.8 to 10.0 4.6 to 9.0 F/A Ratio, max.[3] 1.2 1.2 1.2 F-T Value[4] +2 +2 Blows[5] 50 50 50 Stability, min., pounds[5] (N) 1200 (5338) 1200 (5338) 1200 (5338) Flow, 0.25 mm[5] 8 - 16 8 - 16 8 - 16 Design Air Voids[6] 3.5 3.5 4.0 VMA, min.[7] 15.5 15.5 12.5 CTIndex, min. [8] Report Report Report [1] Sieve, percent passing [2] Percent of total mix [3] Using effective asphalt binder content [4] Percentage points maximum [5] AASHTO T 245 [6] Percent, Supplement 1036 [7] Percent, Supplement 1037 [8] Perform the IDEAL-CT and report results according to Supplement 1033
441.03 Acceptance. The Department will base acceptance of the asphalt concrete mix on the
item specified in the Contract item description. (i.e., 446, 447, 448, 449).
441.04 Basis of Payment . Include the cost of asphalt material to coat vertical faces and seal
joints and gutters in the contract unit price for Item 441. The Department will pay for accepted quantities at the contract prices as follows. Item Unit Description 441 Cubic Yard Asphalt Concrete Surface Course, (Cubic Meter) Type ___, (___), PG64-22 441 Cubic Yard Asphalt Concrete Surface Course, (Cubic Meter) Type ___, (___), PG70-22M 441 Cubic Yard Asphalt Concrete Intermediate Course, (Cubic Meter) Type 1, (___) 441 Cubic Yard Asphalt Concrete Intermediate Course, (Cubic Meter) Type 2, (___) 441 Cubic Yard Anti-Segregation Equipment (Cubic Meter)
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