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Edgewater Creek Bridge Replacement November 2023 106 complete and uniform coating of the particles and thorough distribution of the asphalt 1 binder throughout the mineral materials is ensured. 2 3 When discharged, the temperature of the HMA shall not exceed the optimum mixing 4 temperature by more than 25°F as shown on the reference mix design report or as 5 approved by the Engineer. Also, when a WMA additive is included in the manufacture of 6 HMA, the discharge temperature of the HMA shall not exceed the maximum 7 recommended by the manufacturer of the WMA additive. A maximum water content of 2 8 percent in the mix, at discharge, will be allowed providing the water causes no problems 9 with handling, stripping, or flushing. If the water in the HMA causes any of these 10 problems, the moisture content shall be reduced as directed by the Engineer. 11 12 Storing or holding of the HMA in approved storage facilities will be permitted with 13 approval of the Engineer, but in no event shall the HMA be held for more than 24 hours. 14 HMA held for more than 24 hours after mixing shall be rejected. Rejected HMA shall be 15 disposed of by the Contractor at no expense to the Contracting Agency. The storage 16 facility shall have an accessible device located at the top of the cone or about the third 17 point. The device shall indicate the amount of material in storage. No HMA shall be 18 accepted from the storage facility when the HMA in storage is below the top of the cone 19 of the storage facility, except as the storage facility is being emptied at the end of the 20 working shift. 21 22 Recycled asphalt pavement (RAP) utilized in the production of HMA shall be sized prior 23 to entering the mixer so that a uniform and thoroughly mixed HMA is produced. If there is 24 evidence of the recycled asphalt pavement not breaking down during the heating and 25 mixing of the HMA, the Contractor shall immediately suspend the use of the RAP until 26 changes have been approved by the Engineer. After the required amount of mineral 27 materials, RAP, new asphalt binder and asphalt rejuvenator have been introduced into 28 the mixer the HMA shall be mixed until complete and uniform coating of the particles and 29 thorough distribution of the asphalt binder throughout the mineral materials, and RAP is 30 ensured. 31 32 5-04.3(7) Spreading and Finishing 33 The mixture shall be laid upon an approved surface, spread, and struck off to the grade 34 and elevation established. HMA pavers complying with Section 5-04.3(3) shall be used 35 to distribute the mixture. Unless otherwise directed by the Engineer, the nominal 36 compacted depth of any layer of any course shall not exceed the following: 37 38 HMA Class 1” 0.35 feet 39 HMA Class ¾” and HMA Class ½” 40 wearing course 0.30 feet 41 other courses 0.35 feet 42 HMA Class ⅜” 0.15 feet 43 44 On areas where irregularities or unavoidable obstacles make the use of mechanical 45 spreading and finishing equipment impractical, the paving may be done with other 46 equipment or by hand. 47 48