ITEM 301 ASPHALT CONCRETE BASE
301.01 Description. This work consists of constructing a base course of aggregate and asphalt
binder, mixed in a central plant and spread and compacted on a prepared surface. The requirements of Items 401, 402, and 403 apply with the additional requirements of this specification. The requirements of Item 440 apply except 440.04 and 440.06 do not apply.
301.02 Composition. Furnish aggregate for the mix that conforms to the following gradation:
Sieve Size Total Percent Passing 2 inch (50 mm) 100 1 inch (25.0 mm) 75 to 100 1/2 inch (12.5 mm) 50 to 85 No. 4 (4.75 mm) 25 to 60 No. 8 (2.36 mm) 15 to 45 No. 16 (1.18 mm) 10 to 35 No. 50 (300 µm) 3 to 18 No. 200 (75 µm) 1 to 7 Submit for OMM’s approval the desired percentage of the aggregate passing the No. 4 (4.75 mm) sieve and blend of individual components. The Contractor may use reclaimed asphalt concrete pavement according to 440.05. OMM will establish the required binder content within a range of 4.7 to 7 percent. Do not make changes in these JMF values due to unsatisfactory results or other conditions except as authorized by OMM. Do not start mix production without a preliminary JMF approval and 48 hour notification to District Testing. Final approval of a JMF will be based upon field verification. The JMF can be rejected for failure to verify in the plant or at the project.
301.03 Placement. Ensure that the maximum compacted depth of any one layer is 6 inches (150
mm). Ensure that the temperature of the mixture when delivered to the paver is a minimum of 250 °F (120 °C). Ensure the temperature of the mixture is sufficient for the roller cover age to be effective in compacting the mixture.
301.04 Acceptance. The Department will base acceptance of the asphalt concrete mix on the
item specified in the Contract item description (i.e., 449).
301.05 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 301. The Department will pay for accepted quantities at the contract prices as follows. Item Unit Description 301 Cubic Yard Asphalt Concrete Base (____) (Cubic Meter)
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