HM Pacific Northwest Inc. 5/18/2023

I 1 being moved to the HMA plant for processing into the final mixture. Different aggregate 2 sizes shall be kept separated until they have been delivered to the HMA plant. I 3 4 5-04.3(6) Mixing 5 After the required amount of mineral materials, asphalt binder, recycling agent and anti- 6 stripping additives have been introduced into the mixer the HMA shall be mixed until 7 complete and uniform coating of the particles and thorough distribution of the asphalt I 8 binder throughout the mineral materials is ensured. 9 10 When discharged, the temperature of the HMA shall not exceed the optimum mixing 11 temperature by more than 25°F as shown on the reference mix design report or as 12 approved by the Engineer. Also, when a WMA additive is included in the manufacture of 13 HMA, the discharge temperature of the HMA shall not exceed the maximum 14 recommended by the manufacturer of the WMA additive. A maximum water content of 2 15 percent in the mix, at discharge, will be allowed providing the water causes no problems 16 with handling, stripping, or flushing. If the water in the HMA causes any of these 17 problems, the moisture content shall be reduced as directed by the Engineer. I 18 19 Storing or holding of the HMA in approved storage facilities will be permitted with 20 approval of the Engineer, but in no event shall the HMA be held for more than 24 hours. 21 HMA held for more than 24 hours after mixing shall be rejected. Rejected HMA shall be 22 disposed of by the Contractor at no expense to the Contracting Agency. The storage 23 facility shall have an accessible device located at the top of the cone or about the third I 24 point. The device shall indicate the amount of material in storage. No HMA shall be 25 accepted from the storage facility when the HMA in storage is below the top of the cone 26 of the storage facility, except as the storage facility is being emptied at the end of the I 27 working shift. 28 29 Recycled asphalt pavement (RAP) utilized in the production of HMA shall be sized prior I 30 to entering the mixer so that a uniform and thoroughly mixed HMA is produced. If there is 31 evidence of the recycled asphalt pavement not breaking down during the heating and 32 mixing of the HMA, the Contractor shall immediately suspend the use of the RAP until ' 33 changes have been approved by the Engineer. After the required amount of mineral 34 materials, RAP, new asphalt binder and asphalt rejuvenator have been introduced into 35 the mixer the HMA shall be mixed until complete and uniform coating of the particles and 36 thorough distribution of the asphalt binder throughout the mineral materials, and RAP is 37 ensured. 38 I 39 5-04.3(7) Spreading and Finishing 40 The mixture shall be laid upon an approved surface, spread, and struck off to the grade 41 and elevation established. HMA pavers complying with Section 5-04.3(3) shall be used 42 to distribute the mixture. Unless otherwise directed by the Engineer, the nominal 43 compacted depth of any layer of any course shall not exceed the following: 44 I 45 HMA Class 1" 0.35 feet 46 HMA Class 3/4" and HMA Class '/2" I 47 wearing course 0.30 feet I 2023 FEDERAL OVERLAY FEDERAL AID#STBGUL-2715(011) I WO#3788 March 2,2023 SP-80