Site work and paving for a mixed-use development in Lincoln, Nebraska. Completed plans call for site work for a road / highway; for paving for a road / highway; bridge / tunnel; sidewalk / parking lot; and sidewalk / parking lot.

Location: 56th St, Spruce - Van Dorn, Lincoln In County: Lancaster Start Date: 03/31/2025 32C alendar Days: 187 Price Range: $0.00 to $5,000,000.00 This Project Contains a Dbe Goal of 3.50% This project is funded under the Federal-Aid Highway Act, all appropriate Federal requirements will apply. The Department reserves the right to change these quantities without notice. The last day to submit acceptable prequalification statements for this letting is by 5:00 P.M. on Saturday September 28, 2024. If you have any questions as you are using our Website, please contact us at: Nebraska Department of Transportation Contract Lettings Section P.O. Box 94759 Lincoln, NE 68509-4759 Phone (402) 479-4525 FAX (402) 479-3803 Email: DOT.ContractLettings@nebraska.gov NE DOT - 120 - Concrete Pavement, Bituminous, General (All Classes) - 56th St This work shall consist of repairing Portland Cement Concrete (PCC) base with Portland cement concrete (PCC) at the locations shown in the contract or as designated by the Engineer. The work shall include removing deteriorated concrete base, disposing of the old concrete, stabilization of the underlying subgrade, preparation of the repair area, and furnishing, placing, finishing and curing of the PCC. Base repairs shall be constructed on a prepared subgrade or foundation course as prescribed herein. The thickness of the new concrete base shall match the existing base thickness or as shown on the plans. The average depth of the existing concrete base is 7.3 inches. B. MATERIALS 1. CONCRETE Repairs shall be made with Class 47B-3500. All concrete materials furnished by the Contractor shall conform to the requirements set forth in Section 1002 - Portland Cement Concrete of the current Standard Specifications. 2. ACCEPTANCE REQUIREMENTS All materials used for concrete base repairs and joint repairs, otherwise not listed here shall conform to those requirements in the contract and or the Standard Specifications. C. REMOVALS GENERAL REQUIREMENTS Following milling operations, the Contractor shall remove the concrete base and curbs, if applicable, without damaging the adjacent concrete pavement and curbs. Repair of any damage caused by the operation is at the Contractor's expense. The Contractor shall remove and dispose of all old pavement, reinforcing steel, and all other materials. If reinforcing fabric is encountered, it shall not be replaced. Project No. LCLC-5241(7) Addendum No. 1 Page 2 The Contractor shall cut around the perimeter of the repair area as shown in the plans. All repairs shall be cut so the edges are parallel or perpendicular to the traveled way. Saw overcuts shall be kept to a minimum. The Contractor shall use hand or pneumatic tools to remove the concrete pavement. For larger areas a drop hammer may be used to remove the concrete. D. PREPARATION The repair sections shall be removed to the lines designated in the plans and or by the Engineer, including reinforcement that interferes with the operations. The final subgrade shall be reworked and compacted immediately prior to pavement construction. The subgrade should then be proof rolled, and any unstable areas should be stabilized or excavated and replaced to create a uniform and stable subgrade. Stabilization of subgrade may include moisture conditioning (drying) of soils prior to re-compaction, or removal and replacement with suitable material. The use of geogrid, aggregate, or chemical stabilization as a means of soil stabilization shall only be allowed with the approval of the Engineer. For concrete pavements, the upper 12 inches of the subgrade shall be compacted to a minimum of 90 percent of the maximum dry density at a moisture content between -3 and +4 percent of optimum (ASTM D1557, Modified Proctor). Subgrade preparation should extend a minimum of 2 feet laterally beyond the edge of the pavement where possible. A bond breaker shall be used as shown in the contract. Where the repair area is not bordered by existing concrete pavement, a form shall be used as the pavement edge to provide the same surface elevation and edge alignment as the existing pavement. The form shall be supported or braced in position to prevent movement during the placement and finishing of the concrete. Dowel bars or tie bars shall be anchored into the faces of the existing concrete as designated in the contract. The dowel bar holes shall be drilled at the same plane +- 1/8" and at the spacing shown in the contract. The tie bar holes can be drilled independently. The drilled holes shall be thoroughly cleaned with compressed air to remove all dust, dirt, loose material and moisture. After cleaning and prior to dowel or tie bar insertion, an application of grout or Type IV, Grade 3 epoxy shall be made at the back of the hole. The grout or epoxy shall be from NDOT Approved Products List. Twist the dowel or tie bar one full turn during insertion to completely surround it with the grout or epoxy. The furnishing and installation of dowel and tie bars will not be paid for directly but shall be considered subsidiary to the concrete pavement or base repair work being performed. Project No. LCLC-5241(7) Addendum No. 1 Page 3 E. PLACING AND FINISHING The Contractor shall furnish and place the concrete. The concrete shall be handled and consolidated so there will be no separation of the aggregate and the mortar. An internal vibrator shall be used to consolidate the concrete. A vibrating screed shall be used on a full depth concrete repair that is a full panel width and two or more panels in length, to finish the concrete to the final elevation. The concrete shall be floated with a magnesium bull float and then given a drag finish with wet burlap, carpet, or canvas. The Contractor shall apply curing compound to all concrete pavement repairs. The cure compound shall be applied immediately after each patch is completed. When pavement is to be overlaid with asphaltic concrete, the curing method shall be with tack coat. An approved asphalt emulsion or bituminous based compound may be used with approval of the Engineer. Class 47B-3500 concrete pavement repairs shall not be opened to traffic until the compressive strength reaches 3,000 psi as determined by the Maturity Method or cylinders, at the discretion of the Engineer. Concrete shall not be placed when ambient air temperature is expected to drop below 40F (4C) during the cure period. Following the appropriate curing period, the base repair will be overlaid with a 3.5" hot-mix asphalt (HMA) overlay. The HMA overlay will be paid for separately under other contract items. F. BASIS OF PAYMENT The removal of existing pavement, subgrade stabilization, and placement of new concrete base pavement as called for on the plans, completed in conformance to these Standard Specifications and accepted by the Engineer, shall be counted and paid for at the contract unit price bid per square yard for BASE REPAIR. No classifications shall be made as to the depth of pavement. Such payment shall be full compensation for all excavation, removal to the lines indicated, subgrade stabilization, new PCC base, materials, equipment, tools, labor, and incidentals necessary to complete the work. *The value for this project is based on a financial range. The value is listed as the highest possible cost from the range provided by a stakeholder or official project document.