121 ALASKA 2020 DIVISION 400 –ASPHAL T PAVEMENTS AND SURFACE TREATMENTS SECTION 401 HOT MIX ASPHALT PAVE MENT
401-1.01 DESCRIPTION . Construct one or more courses of plant -produced Hot Mix Asphalt
(HMA) pavement on an approved surface, to the lines, grades, and depths shown on the Plans. MATERIALS
401-2.01 ASPHALT BI NDER . Conform to Subsection 702- 2.01. Asphalt binder may be
conditionally accepted at the source providing a manufacturers certificati on of compliance according to Subsection 106- 1.05, and test results of the applicable requirements of Section 702. Use PG 52 -28 if no Grade is specified.
401-2.02 LIQUID ANT I-STRIP ADDITIVE. Use anti -strip agents in the proportions determined
by ATM 414 and included in the approved Job Mix Design (JMD). At least 90 percent of the aggregate must remain coated when tested according to ATM 414. The following minimum dose (percent) of liquid anti -strip by weight of asphalt binder is required:
401-2.03 JOINT ADHE SIVE. Conform to Subsection 702- 2.05.
401-2.04 JOINT SEAL ANT. Conform to Subsection 702- 2.06.
401-2.05 WARM MIX ASPHALT . Conform to Subsection 702- 2.07.
401-2.06 ASPHALT RE LEASE AGENT . Conform to Subsection 702- 2.08.
401-2.07 AGGREGATES . Conform to Subsection 703- 2.04. Use a minimum of three stockpiles
of crushed aggregate (coarse, intermediate, and fine). Place blend material, if any, in a fourth pile.
401-2.08 RECYCLED A SPHALT PAVEMENT . Recycled asphalt pavement (RAP) may be used
in the production of HMA. The RAP may be from pavements removed under the Contract, or from an existing stockpile. Conform to Subsection 703 -2.16.
401-2.09 JOB MIX DES IGN. Provide target values for gradation that satisfy both the broad band
gradation limits shown in Table 703- 4 and the requirements of Table 401- 1, for the Type and Class of HMA specified. TABLE 401 -1 HMA MARSHALL DESIGN REQUIREMENTS DESIGN PARAMETER CLASS “A” CLASS “B” HMA (Including Asphalt Binder) Stability, Pounds 1800 Min. 1200 Min. Flow, 0.01 Inch 8 – 14 8 - 16 Voids in Total Mix (VTM), % 3.0 – 5.0 3.0 – 5.0 Compaction, Number of Blows Ea ch Side of 75 50 Liquid Anti -strip Type Minimum Dose by Weight of Asphalt Binder, % Amines based 0.30 Phosphate Ester based 0.30 Organo -Silane based 0.05