Drainage Units
1016.01 Concrete Pipe and Precast Drainage Units.
Concrete drainage units include box culverts, three-sided structures, manholes, junction boxes, catch basins, and safety ends. Use concrete pipe and precast drainage units that are on the Approved Materials List and are from Certified Plants. All shop drawings must be approved by the Project Engineer before fabrication can begin. Cementitious materials shall comply with Section 1001. Substitutions for cement are allowed in accordance with 901.07. Admixtures shall comply with 1011.02, except that chloride-type accelerators are not allowed. Class A1 concrete shall comply with Section 901. The addition of synthetic fibers will only be allowed upon approval of the Construction Fabrication Engineer.
1016.01.1 Joint Systems and Gaskets: Joint systems shall
comply with 1018.03. A Type 2 or 3 joint system may be substituted for a Type 1 joint system; a Type 3 joint system may be substituted for a Type 2 joint system. Use gaskets from the Approved Materials List. Rubber gaskets for pipe joints shall comply with ASTM C443. Each rubber gasket shall be identified with a batch or lot number. Flexible sealants for pipe joints shall comply with ASTM C990.
1016.01.2 Curing: Concrete pipe and box culverts shall be cured by
one of the methods listed in ASTM C76 or ASTM C1577, as applicable. No other combination or methods will be allowed. Precast manholes, catch basins, junction boxes, and safety ends shall be cured in accordance with 805.06 or 805.09.4. For curing concrete three-sided structures that are wet-cast products, keep forms in place for one curing day in accordance with 805.07. When structures are manufactur ed using the dry -cast method, follow curing procedures in ASTM C1504.
1016.01.3 Lots: A lot is one day’s production.
1016.01.4 Compressive Strength: Compressive strength shall
comply with the applicable ASTM specification for the product. For each lot, five compressive strength cylinders shall be made and field- cured in accordance with DOTD TR 227 and broken in accordance with DOTD TR 230. The ASTM C497 core test may be used in lieu of cylinder tests, with approval of the Construction Fabrication Engineer. For pipe, the ASTM C497 three -edge bearing test (3EB) may be used in lieu of cylinders. The Department reserves the right to have any concrete pipe tested at no cost to the Department to ultimate load using 3EB. The 3EB test is required yearly to retain plant certification. Compressive strength must be verified by cylinders, cores or 3EB before shipping.
1016.01.5 Precast Unit Markings: Identifying information shall
be indented into the concrete or painted thereon with waterproof paint on each unit on the inside and outside of the unit in such a manner as to be legible at time of delivery. Information shall include the name or trademark of the manufacturer, the date of casting, and the structure number or the station number as shown on the plans.
1016.01.6 Pipe Connections to Precast Units: For concrete
pipe connections, use resilient connectors conforming to ASTM C923 or use grout connection. For grout connections each opening shall be 4±1/2 inches larger than the outside diameter of the pipe for which it is provided. For connecting plasti c and metal pipe to precast units use resilient connectors conforming to ASTM C923.
1016.02 REINFORCED CONCRETE PIPE (RCP). Comply with
ASTM C76, amended as follows:
1.Unless otherwise specified, use Class III, Wall A, B, or C pipe.
2.When extra strength pipe is r equired, use either Class IV or Class V as specified. Use Wall A, B, or C.
3.For pipe sizes not included in ASTM C76, the area of reinforcement shall be designed in accordance with ASTM C655. Provide fabrication drawings and design calculations reflecting compliance with these specifications prior to pipe fabrication.
4.If allowed, modified designs require review and approval from the DOTD Hydraulics and Construction Fabrication Units. Minor modifications to facilitate fabrication processes may be used with t he Construction Fabrication Engineer’s approval.
1016.03 Reinforced Concrete Pipe Arch, (Rcpa).
Comply with ASTM C506, amended as follows:
1.Unless otherwise specified, use Class III pipe arch.
2.For pipe arch sizes not included in ASTM C506, the area of reinforcement shall be designed in accordance with ASTM C655. Provide fabrication drawings and design calculations reflecting compliance with these specifications prior to pipe fabrication.
3.If allowed, modified designs require review and approval from the DOTD Hydraulics and Construction Fabrication Units. Minor modifications to facilitate fabrication processes may be used with the Construction Fabrication Engineer’s approval.
1016.04 Precast Reinforced Concrete Box Culverts.
Comply with ASTM C1577 amended as follows:
1.Use Table 1.
2.Provide concrete with a Surface Resistivity at 28 days of 22 (kΩ-cm).
3.If allowed, modified designs require review and approval from the DOTD Hydraulics and Construction Fabrication Units. Minor modifications to facilitate fabrication p rocesses may be used with the Construction Fabrication Engineer’s approval.
4.When approved, minor surface cavities or irregularities which do not impair the service value of the unit and which can be corrected without marring its appearance shall be pointed with patching material from the Approved Materials List as soon as forms are removed.
1016.05 CONCRETE THREE-SIDED STRUCTURES. Comply with
ASTM C1504.
1016.06 Precast Reinforced Concrete Manholes,
CATCH BASINS, JUNCTION BOXES, AND SAFETY ENDS. Comply with the dimensions shown on the plans, and the following: Circular precast concrete manholes shall comply with ASTM C478, except that Class A1 concrete shall be used. Square or rectangular precast concrete catch basins, junction boxes and drain manholes shall compl y with ASTM C858, except that Class A1 concrete shall be used. Precast safety ends shall comply with 702.04.3. Portland cement concrete shall attain a minimum compressive strength of 4500 psi before shipping of the units. Castings for frames, grates and covers shall comply with 1013.05 for steel and shall comply with 1013.06 for gray iron or malleable iron castings. Galvanization shall conform to ASTM A123.
1016.06.1 Casting Concrete: When multiple castings are to be
made using the same forms, the use of metal non-panel forms are required. Concrete shall be placed into each sectional unit without interruption and shall be consolidated to force the concrete into the corners of forms and prevent formation of stone pockets or cleavage planes.
1016.06.2 Reinforcement: Reinforcement shall be as shown on the
plans, and shall not vary more than 1/4 inch from the positions shown, except at pipe connections. Cover on reinforcement shall not be less than that shown on the plans.
Referenced in this section
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Source: Standard Specifications for Roads and Bridges, 2016 Edition. Pages 1099–1102 of 1,145. View official source ↗