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18TH STREET PEDESTRIAN IMPROVEMENTS 3741 RMT July 03, 2024 47 1 5-04.3(4)C Pavement Repair 2 The Contractor shall excavate pavement repair areas and shall backfill these with HMA 3 in accordance with the details shown in the Plans and as marked in the field. The 4 Contractor shall conduct the excavation operations in a manner that will protect the 5 pavement that is to remain. Pavement not designated to be removed that is damaged as 6 a result of the Contractor’s operations shall be repaired by the Contractor to the 7 satisfaction of the Engineer at no cost to the Contracting Agency. The Contractor shall 8 excavate only within one lane at a time unless approved otherwise by the Engineer. The 9 Contractor shall not excavate more area than can be completely finished during the 10 same shift, unless approved by the Engineer. 11 12 Unless otherwise shown in the Plans or determined by the Engineer, excavate to a depth 13 of 1.0 feet. The Engineer will make the final determination of the excavation depth 14 required. The minimum width of any pavement repair area shall be 40 inches unless 15 shown otherwise in the Plans. Before any excavation, the existing pavement shall be 16 sawcut or shall be removed by a pavement grinder. Excavated materials will become the 17 property of the Contractor and shall be disposed of in a Contractor provided site off the 18 Right of Way or used in accordance with Sections 2-02.3(3) or 9-03.21. 19 20 Asphalt for tack coat shall be required as specified in Section 5-04.3(4). A heavy 21 application of tack coat shall be applied to all surfaces of existing pavement in the 22 pavement repair area. 23 24 Placement of the HMA backfill shall be accomplished in lifts not to exceed 0.35-foot 25 compacted depth. Lifts that exceed 0.35-foot of compacted depth may be accomplished 26 with the approval of the Engineer. Each lift shall be thoroughly compacted by a 27 mechanical tamper or a roller. 28 29 5-04.3(5) Producing/Stockpiling Aggregates and RAP 30 Aggregates and RAP shall be stockpiled according to the requirements of Section 3-02. 31 Sufficient storage space shall be provided for each size of aggregate and RAP. Materials 32 shall be removed from stockpile(s) in a manner to ensure minimal segregation when 33 being moved to the HMA plant for processing into the final mixture. Different aggregate 34 sizes shall be kept separated until they have been delivered to the HMA plant. 35 36 5-04.3(6) Mixing 37 After the required amount of mineral materials, asphalt binder, recycling agent and anti-38 stripping additives have been introduced into the mixer the HMA shall be mixed until 39 complete and uniform coating of the particles and thorough distribution of the asphalt 40 binder throughout the mineral materials is ensured. 41 42 When discharged, the temperature of the HMA shall not exceed the optimum mixing 43 temperature by more than 25°F as shown on the reference mix design report or as 44 approved by the Engineer. Also, when a WMA additive is included in the manufacture of 45 HMA, the discharge temperature of the HMA shall not exceed the maximum 46 recommended by the manufacturer of the WMA additive. A maximum water content of 2 47 percent in the mix, at discharge, will be allowed providing the water causes no problems 48