Section 600 INCIDENTAL CONSTRUCTION Section 601.-MOBILIZATION Description 601.01 Mobilization. Mobilization shall consist of preparatory work and operations, including, but not limited to, those necessary to the movement of personnel, equipment, supplies and incidentals to the Project site; and for all other work and operations which must be performed or costs incurred prior to beginning work on the various items on the Project site. Basis of Payment 601.02 Partial Payments will be made as follows: (1) When 5 percent of the original contract amount is earned from other bid items, 50 percent of the amount of mobilization, or 5 percent of the original contract amount, whichever is lesser, will be paid. (2) When 10 percent of the original contract amount is earned from other bid items, 100 percent of the amount for mobilization, or 10 percent of the original contract amount, whichever is lesser, will be paid. (3) Upon completion of all work on the Project, payment of any amount bid for Mobilization in excess of 10% of the original contract amount, will be paid. (4) The total sum of all payments shall not exceed the original contract amount bid for the Item, regardless of the fact that the Contractor may have, for any reason, shut down his work on the Project or moved equipment away from the Project and then back again. Payment will be made under: Pay item. 601(1) Mobilization Pay unit Lump sum. Section 602.-MINOR CONCRETE STRUCTURES Description 602.01 Scope. This work shall consist of reinforced concrete headwalls, inlet basins, and other minor concrete structures constructed in conformity with the lines, grades, and dimensions shown on the plans or as ordered in writing by the engineer, and in accordance with this and other specification sections involved. Materials 602.02 Materials. Materials shall meet the requirements specified in the following subsections. Method A-The concrete shall contain 5 ± 1 percent of entrained air, as determined by AASHTO T 152. Concrete shall have a slump of not more than 4 inches (102 mm), as determined by AASHTO T 119. The concrete shall develop a minimum compressive strength of 3000 psi (20.7 MPa) in 28 days as determined by test cylinders made in accordance with AASHTO T 23 and tested in accordance with AASHTO T 22. Failure of two out of three cylinders for any pour shall require the removal of the concrete and its replacement at the contractor's expense. The Engineer may take test cylinders for accelerated strength determinations in accordance with ASTM C 684. If the strength level of the concrete as determined by the accelerated 1 or 2-day tests indicates that the 28-day strength potential will meet or exceed the requirements, the Engineer may waive the 28-day requirements and accept the concrete on the basis of the accelerated strength. Method B-Certification. If specified in the special provisions, the Engineer may approve the use of portland cement concrete on the basis of a certification. The contractor shall submit for approval the following statement. (a) The type and sources of aggregates. (b) Type and source of cement. (c) Scale weights of each aggregate proposed as pounds per cubic yard of concrete. (d) Quantity of water proposed as pounds per cubic yard of concrete. (e) Quantity of cement proposed as pounds per cubic yard of concrete. The concrete shall contain not less than 517 pounds (235 kg) of cement per cubic yard (0.765 m3). The concrete shall be subject to acceptance or rejection by visual inspection at the job site. Retempering concrete will not be permitted. When a commercial supplier is used the contractor shall furnish a certification with each truck load of concrete certifying that the material and mix proportions used are in conformance with the approved mixture. Concrete meeting the material and proportioning requirements of Class A(AE) concrete will be acceptable as an approved mixture and may be certified to as such. Construction Requirements 602.04 Forms. Forms shall be so designed and constructed that they may be removed without injuring the concrete. They shall be free of bulge and warp, and constructed in such manner that the finished concrete shall be of the form and dimensions shown on the plans, and true to line and grade. 602.05 Placing Concrete. Concrete shall be placed in such manner as to avoid segregation. High-frequency internal vibrators shall be used for compacting concrete in the forms. Vibrators shall be so manipulated as to produce concrete free of voids, but shall not be held so long in one place as to result in segregation or formation of laitance on the surface. 602.06 Curing Concrete. All concrete will be cured a minimum of 7 days, or, if high early strength cement is used, a minimum of 3 days. The concrete shall be adequately cured. Method of Measurement 602.07 Concrete. The quantity of concrete to be paid for on this contract shall be the final quantity in accordance with subsection 109.01. 602.08 Other Items. Reinforcing steel, anchor bolts or other approved fastenings and any other incidental items included in the completed and accepted structure shall not be measured for payment, but shall be considered incidental to other work performed under this section. Basis of Payment 602.09 The quantities, determined as provided above, will be paid for at the contract price per unit per measurement for the pay item listed below, which price and payment shall be full compensation for furnishing and placing all materials, including all labor, equipment, tools, and incidentals necessary to complete the work prescribed in this section. Excavation and backfill will be measured and paid for as provided in Section 206. Payment will be made under: 602 (1) Concrete Pay Unit Section 603.-PIPE CULVERTS AND STORM DRAINS Description 603.01 This work shall consist of the construction or reconstruction of pipe culverts and storm drains, hereinafter referred to as "conduit" in accordance with these specifications and in reasonably close conformity with the lines and grades shown on the plans or established by the Engineer. Reinforced Concrete Arch Culvert, Storm Drain and Sewer 706.14 Reinforced Concrete Elliptical Culvert, Storm Drain, and Sewer Pipe--- 706.15 Reinforced Concrete D-Load Culvert Storm Drain and 706.16 Corrugated Iron or Steel Pipe and Pipe Arches 707.02 Bituminous Coated Corrugated Iron or Steel Pipe and Pipe 707.03 Corrugated Aluminum Alloy Culvert Pipe . 707.06 Bituminous Coated Corrugated Aluminum Alloy Culvert Pipe 707.08 Structural Plate for Pipe, Pipe Arch and Arches 707.10 Full Bituminous Coated Structural Plate Pipe, Pipe Arch and 707.11 Aluminum Alloy Structural Plate for Pipe, Pipe Arch and 707.12 Full Bituminous Coated Aluminum Alloy Structural Plate 707.13 Cast Iron Culvert Pipe. 707.01 Poly Vinyl Chloride (PVC) Sewer and Drain Pipe 706.17 Vitrified Clay Pipe..... 706.08 Bedding material shall conform to the requirements of subsection 603.04. Backfill materials shall conform to the requirements of subsection 603.08. When the location of manufacturing plants allows, the plants will be inspected periodically for compliance with specified manufacturing methods, and material samples will be obtained for laboratory testing for compliance with materials quality requirements. This can be the basis for acceptance of manufacturing lots as to quality. Prior to and during incorporation of materials in the work, these materials will be subject to the latest practicable inspections and checks by the Engineer. End sections shall be constructed of the same material as the main section of the culvert. Bituminous coated end sections shall be coated in conformity with AASHTO M 243 or AASHTO M 190. Construction Requirements 603.03 Excavation. Trenches shall be excavated in accordance with the requirements of Section 206-Structure Excavation, to a width sufficient to allow for proper jointing of the conduit and thorough compaction of the bedding and backfill material under and around the conduit. Where feasible, trench walls shall be vertical. The completed trench bottom shall be firm for its full length and width. Where required, in the case of cross drains, the trench shall have a longitudinal camber of the magnitude specified. When so specified on the plans, the excavation for conduits placed in embankment fill, shall be made after the embankment has been completed to the specified or directed height above the designed grade of the conduit. |