620.01 Description.
paid for at the contract unit price bid for the end treatment. Such price shall be full compensation for the furnishing of all materials and the installation and construction thereof, except for the items of Structure Excavation and Foundation Backfill, necessary for the complete construction of the end treatment, and for all labor, tools, equipment, and incidentals necessary to complete the work.
b.Payment will be made under Item No .: 619-A ___ inch {mm} * Pipe End Treatment, Class ____ - per each 619-B ___ inch {mm} Span, ___ inch {mm} Rise * Pipe End Treatment, Class ____ - per each * Specify Roadway or Side Drain. MINOR STRUCTURE CONC RETE
620.01 Description.
This Section shall cover the work of constructing minor concrete structures such as pipe culvert headwalls, inlets and junction boxes, concrete steps, coping walls, and other miscellaneous items. All of which shall be constructed in accordance with the details shown on the plans and these specifications to the lines and grades established by the plans or directed.
620.02 Materials.
All materials furnished for use shall conform to the requirements o f Division 800, Materials, and the following: Section 501 Structure Concrete Section 502 Reinforcing Steel
620.03 Construction Requirements.
a.General . The concrete mix used for minor structure work shall be Class A concrete unless otherwise provided by plan details, all in accordance with the appropriate provisions of Section 501.
b.Excavation and Backfill . Excavation and backfill shall be in accordance with the provisions of Sections 210 and 214.
c.Forming and Placing of Concrete . Construction, forming, placing, etc. of the structures shall be in accordance with the requirements given in Section 501 .
d.Finishing and Curing . Attention is directed to the requirement given in Section 501 that all surfaces receive a Class 1 surface finish and that all exposed surfaces receive a Class 2 surface finish, unless otherwise specified in the proposal or by plan requirements. In order to permit proper surface finishing, forms may be removed as soon as the concrete has set sufficiently that for m removal will not damage the green concrete, but in no event less than 12 hours after completion of the placing. Immediately after the pouring operations, surfaces not covered by forms shall be covered with one of the curing materials specified in Section 830. Immediately after the removal of the forms, the surface finishing operations noted in S ection 501 shall commence, and the curing operations continued for at least 72 hours after the finishing operation, using one of the curing materials specified in Section 830 and the related curing method required with the material used. Failure to apply the initial surface finish or perform the curing operation as noted herein shall be just cause for rejection of the concrete. Removal and replacement of rejected co ncrete shall be at no additional cost to the Department.
e.Concrete Surface Tolerances. The finished concrete shall be within reasonably close conformity to the lines, grades, and dimensions shown on the plans or directed, and free from objectionable cav ities or projections.
621.02 Materials.
620.04 Method of Measurement.
The volume of accepted concrete within the neat lines of the structure as shown on the plans or revised at the written direction of the Engineer will be computed in cubic yards {cubic meters}. The method of average end areas will not be used where results obtained differ from those obtained by more accurate mathematical computation. No deduction will be made for the volume of concrete displaced by steel reinforcement, weep holes, conduits, anchor bolts, or for chamfers of less than 3 inch {75 mm} leg measurements. Attention is directed to Section 502 for Reinforcing Steel, and Sections 210 and 214 for Excavation and Foundation Backfill.
620.05 Basis of Payment.
a.Unit Price Coverage . The accepted Minor St ructure Concrete, measured as noted above, will be paid for at the contract unit price bid which shall be full compensation for the concrete complete in place including furnishing all materials (except reinforcing steel), form work, finishing and for all e quipment, tools, labor, and incidentals necessary to complete the item in accordance with plan details and these specifications. In case of modification to an existing structure, the breaking away of the concrete to the approximate lines shown on the plans and the disposal of the broken concrete and the preparation of the retained steel reinforcement for splicing as required shall be considered incidental to the work and the cost thereof absorbed in the unit price bid.
b.Payment will be made under Item No .: 620-A Minor Structure Concrete - per cubic yard {cubic meter} SECTION 621 INLETS, JUNCTION BOXES, MANHOLES, AND MISCELLANEOUS DRAINAGE STRUCTURES
621.01 Description.
This Section shall cover the work of furnishing and installing miscellaneous drainage structures including necessary metal frames, grates, covers, etc. in accordance with the plan details and these specifications at the locations and to the grades shown on the plans or directed by the Engineer. The various units will be further designated by type to distinguish shape, size, etc. by plan details. Certain units or portions of units may be constructed of cast -in-place concrete, precast concrete, and/or masonry as specified by plan details. This Section shall also include the furnishing and installing of grates on new or existing structures when the Item of 621 -G is provided on the plans, otherwise, inlet grates are classified as an integral part of the inlet or catch basin. This Section shall also include the furnishing and installing of stilling basins when the Item of 621 -I is provided on the plans.
621.02 Materials.
a.Concrete, Reinforcing Steel and Masonry . Concrete and reinforcing steel for cast -in-place units and for precast units or parts of units not covered by other requirements shall conform to the requirements of Sections 620 and 502. Precast concrete units or portions of units shall conform to the appropriate requ irements of ASTM C 478, and Section 831 unless otherwise provided by plan details or by Department approval. Masonry materials shall conform to the requirements of Section 613 utilizing brick or block meeting the following requirements: Clay or Shale - ASTM C 32 Grade SS, MS, or MM. Concrete brick - ASTM C 55, Type I, Grade N. Concrete block - ASTM C 90, Type I or II, Grade N.
Source: Alabama Standard Specifications for Highway Construction, 2022 Edition. Pages 503–503 of 934.