Granite Construction 5/14/2020 - Laserfiche WebLink

1 1 Unless otherwise shown in the Plans or determined by the Engineer, excavate to a depth of 1 2 1.0 feet. The Engineer will make the final determination of the excavation depth required. 3 The minimum width of any pavement repair area shall be 40 inches unless shown otherwise 4 in the Plans. Before any excavation, the existing pavement shall be sawcut or shall be I 5 removed by a pavement grinder. Excavated materials will become the property of the 6 Contractor and shall be disposed of in a Contractor provided site off the Right of Way or 7 used in accordance with Sections 2-02.3(3) or 9-03.21. I 8 9 Asphalt for tack coat shall be required as specified in Section 5-04.3(4). A heavy application 10 of tack coat shall be applied to all surfaces of existing pavement in the pavement repair I11 area. 12 13 Placement of the HMA backfill shall be accomplished in lifts not to exceed 0.35-foot 14 compacted depth. Lifts that exceed 0.35-foot of compacted depth may be accomplished with 15 the approval of the Engineer. Each lift shall be thoroughly compacted by a mechanical 16 tamper or a roller. 17 18 5-04.3(5) Producing/Stockpiling Aggregates and RAP I 19 Aggregates and RAP shall be stockpiled according to the requirements of Section 3-02. 20 Sufficient storage space shall be provided for each size of aggregate and RAP. Materials 21 shall be removed from stockpile(s) in a manner to ensure minimal segregation when being I 22 moved to the HMA plant for processing into the final mixture. Different aggregate sizes shall 23 be kept separated until they have been delivered to the HMA plant. 24 I 25 5-04.3(6) Mixing 26 After the required amount of mineral materials, asphalt binder, recycling agent and anti- 27 stripping additives have been introduced into the mixer the HMA shall be mixed until I 28 complete and uniform coating of the particles and thorough distribution of the asphalt binder 29 throughout the mineral materials is ensured. 30 31 When discharged, the temperature of the HMA shall not exceed the optimum mixing 32 temperature by more than 25°F as shown on the reference mix design report or as approved 33 by the Engineer. Also, when a WMA additive is included in the manufacture of HMA, the 111 34 discharge temperature of the HMA shall not exceed the maximum recommended by the 35 manufacturer of the WMA additive. A maximum water content of 2 percent in the mix, at 36 discharge, will be allowed providing the water causes no problems with handling, stripping, I 37 38 or flushing. If the water in the HMA causes any of these problems, the moisture content shall be reduced as directed by the Engineer. 39 40 Storing or holding of the HMA in approved storage facilities will be permitted with approval of 41 the Engineer, but in no event shall the HMA be held for more than 24 hours. HMA held for 42 more than 24 hours after mixing shall be rejected. Rejected HMA shall be disposed of by the I 43 Contractor at no expense to the Contracting Agency. The storage facility shall have an 44 accessible device located at the top of the cone or about the third point. The device shall 45 indicate the amount of material in storage. No HMA shall be accepted from the storage I 46 facility when the HMA in storage is below the top of the cone of the storage facility, except 47 as the storage facility is being emptied at the end of the working shift. 48 I 49 Recycled asphalt pavement (RAP) utilized in the production of HMA shall be sized prior to 50 entering the mixer so that a uniform and thoroughly mixed HMA is produced. If there is I 2020 PAVEMENT MAINTENANCE OVERLAY PAGE 51 OF 79 SPECIAL RYV0SION 02S WORK ORDER 3727