176 SECTION 258
258.01 Description
This work consists of placing cast-in -place concrete slope protection.
258.02 Equipment
Reserved.
258.03 Materials
Material Section AE-3 Concrete 802 Preformed Expansion Joint Filler 826.02 Joint Seal ant 826.02 A.2 Reinforcing Steel 836.02 Steel Welded Reinforcement, Plain, for Concrete 836.03 B
258.04 Construction Requirements
A.Preparation of Subgrade. Remove vegetation and deleterious material. Compact all loose material. Wet surfaces before placing concrete. Do not place concrete on soft subgrade or in standing water.
B.Placing Concrete. Place and consolidate concrete using methods that prevent segregation and sagging. Place a construction joint at the end of the panel if placement of concrete is stopped for more than 30 minutes.
C.Transverse Grooved Joints. Construct transverse grooved joints in the surface of the plastic concrete. Maintain the transverse grooved joints during finishing operations until the concrete has hardened. Seal the joints after the concrete becomes stiff enough to prevent distortion to the groove or damage to the concrete. Clear the joints of foreign material and water before sealing. Apply the sealer with a caulking gun or other approved device.
D.Finishing Concrete. Finish the surface so there are no ir regularities greater than 0.75 inch in 10 feet.
E.Curing Concrete. Cure concrete as specified in Section 550.04 I, “Curing Concrete” , with the following exception: Cure the concrete for a minimum of 5 days.
258.05 Method of Measurement
The Engineer will measure, completed and in place, as specified in Section 109.01, “Measurement of Quantities”.
258.06 Basis of Payment
Pay Item Pay Unit Concrete Slope Protection Square Yard Remove & Replace Concrete Slope Protection Square Yard Such payment is full compensation for furnishing all materials, earthwork, equipment, labor, and incidentals to complete the work as specified. Section 260 178 SECTION 260 SILT FENCE
260.01 Description
This work consists of furnishing, installing, maintaining, and removing silt fence.
260.02 Equipment
Reserved.
260.03 Materials
A.Posts. Do not use silt fence with posts pre-attached. Use posts that have a minimum length of 4 feet.
1.Wood Posts. Use one of the following wood posts with the minimum dimensions: − 2 inch diameter round wood posts; or − 1.5 × 1.5 inches rectangular wood posts.
2.Steel Posts. Use steel posts that are a minimum of 0.95 pounds per foot and have projections for fastening wire or fabri c.
B.Filter Fabric. Provide filter fabric as specified in AASHTO M 288. Use fabric with a minimum width of 36 inches. Protect the filter fabric from moisture and ultraviolet exposure before placement.
C.Silt Fence Supported. Use wire backing or monofi lament silt fence when installing supported silt fence. If backing for a silt fence is required, use a steel wire fence fabric meeting the following: - A minimum of 32 inches wide; - Has a maximum opening size of 6 × 6 inches; and - Is a minimum of 14 gauge, gr ade 60.
260.04 Construction Requirements
A.Installation. Install continuous silt fences transverse to the flow and follow the contours of the site. Place the fence so water cannot flow around the end of the fence. If joining two sections of filter fabric, overlap at support posts a minimum of 18 inches in such a manner that prevents silt from passing through the fence.
B.Maintenance. Remove sediment when it reaches 1/3 of the exposed height of any section of the silt fence, or as directed by the Engineer. The Engineer may direct the installation of additional silt fence if removing the sediment deposit is not feasible.
Source: North Dakota Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 211–212 of 550.