ITEM 424 FINE GRADED POLYMER ASPHALT CONCRETE
424.01 Description. This work consists of constructing a surface course of aggregate and
polymer modified asphalt binder mixed in a central plant and spread and compacted on a prepared surface. The requirements of Items 401, 402, 403, and 440 apply with the additional requirements of this specification.
424.02 Composition.
A.Type A. Use 8.5 percent modified asphalt binder by total mix weight.
B.Type B. Submit a proposed JMF according to Item 440 to the Laboratory that meets the requirements of a Type 1 surface course, except as follows:
1.Minimum VMA, 15.0 percent
2.Minimum total binder content, 6.7 percent
3.Design air voids, 4.0 percent
4.For projects with less than 1500 trucks use 50 blows, for projects with greater than or equal to 1500 trucks use 75 blows. If multiple sections with differing traffic counts occur on a project use 75 blows for the project. Trucks = Current ADT × T24 Where: Current ADT = current average daily traffic count from the plans T24 = percent trucks per day from the plans
D.RAP and RAS. Do not use RAS. Ten percent RAP may be used in a Type B mix if all requirements of footnote [3] in Table 424.02-1 are met by the RAP. Do not use RAP in a Type A mix.
E.Aggregate. Furnish clean, uncoated aggregate conforming to the applicable requirements of Table
424.02 1 and quality requirements of 703.05.
TABLE 424.02-1 - MIX GRADATION Sieve Size Total Percent Passing Type A [1][2] Type B [1][3][4] 1/2 inch (12.5 mm) 100 3/8 inch (9.5 mm) 100 95 to 100 No. 4 (4.75 mm) 95 to 100 85 to 95 No. 8 (2.36 mm) 90 to 100 53 to 63 No. 16 (1.18 mm) 80 to 100 37 to 47 No. 30 (600 µm) 60 to 90 25 to 35 No. 50 (300 µm) 30 to 65 9 to 19 No. 100 (150 µm) 10 to 30 -- No. 200 (75 µm) 3 to 10 3 to 8 [1] Gradation includes any baghouse fines and mineral filler and is specified in percent passing. [2] Use natural sand with at least 50 percent silicon dioxide by weight according to 703.05.D. [3] Fine Aggregate - Use natural sand with at least 50 percent silicon dioxide by weight according to
703.05 D. For 50 blow mixes, use no more than 20 percent limestone sand, No. 10 limestone, or
combination of both by weight of total aggregate. For 75 blow mixes, use 20 percent limestone sand, No. 10 limestone, air cooled slag sand or combination thereof by weig ht of total aggregate. Baghouse fines and mineral filler percentages used will be included with the percentages for limestone sand, No. 10 limestone, and air cooled slag sand and not for natural sand. If 10 percent RAP is used the silicon dioxide content of the total natural sand blend must be at least 50 percent. Contact OMM for guidance on submitting RAP aggregate silicon dioxide data. [4] Coarse Aggregate - For 50 blow mixes, for the final blend of all coarse aggregate use a minimum 10 percent two or more fractured faces aggregate. For 75 blow mixes, use 100 percent two or more fractured faces aggregate. Meet the two or more fractured faces aggregate criteria of ASTM D5821- 13.
424.03 Mixing. Discharge the mix from the plant at temperatures from 335 °F to 370 °F (168 °C
to 188 °C) for hot mix asphalt or 300 °F to 340 °F (149 °C to 171 °C) for warm mix asphalt
424.04 Acceptance. The Department will base acceptance of the asphalt concrete mix on the
item specified in the Contract item description. (i.e., 448, 449). For Type A mixes comply with acceptance requirements of 449.
424.05 Method of Measurement. For Type A mixes use a unit weight conversion of 1.75
tons/cubic yard (2.08 metric tons/cubic meter).
424.06 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 424.The Department will pay for accepted quantities at the contract prices as follows: Item Unit Description 424 Cubic Yard Fine Graded Polymer (Cubic Meter) Asphalt Concrete, Type A, (449) 424 Cubic Yard Fine Graded Polymer (Cubic Meter) Asphalt Concrete, Type B, (___) ITEM 440 ASPHALT CONCRETE MIX DESIGN — GENERAL
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Source: Construction and Material Specifications, 2023 (rev. 7/17/2026) Edition. Pages 226–228 of 892. View official source ↗