447 SECTION 854
854.01 Galvanizing
Galvanize iron and steel products to meet AASHTO M 111. Galvanize Iron and Steel Hardware to meet AASHTO M 232.
854.02 Damaged Galvanized Coatings
Repair damaged galvanized coatings to meet ASTM A 780. Section 856 448 SECTION 856 EROSION CONTROL BLANKET AND TURF REINFORCEMENT MAT
856.01 Erosion Control Blanket (Ecb)
A.General. Provide erosion control blanket (ECB) of organic biodegradable mulch material such as straw, curled wood excelsior, coconut fiber, or any combination of these materials. Provide ECB that has a consistent thickness of mulch material evenly distributed over the entire area. Secure the ECB materials on at least one side with netting. Use netting of photodegradable polypropylene or other plastic material fused to the strand intersections. Provide ECB that has a minimum width of 48 inches and is weed and pest free. Provide ECB that meets the requirements of Tables 856-01 and 856-02 for the type specified in the contract. The requirements in Tables 856-01 and 856-02 are derived from information obtained from the Erosion Control Technology Council. All values must be within 10 percent of the values shown on the table. Table 856 -01 ECB Type 1 and 2 TYPE ECB 1 ECB 2 Straw Wood Straw Wood Material 100% Straw 100% Excelsior Fibers 100% Straw 100% Excelsior Fibers Fiber Length 80% Must Be Greater Than 3 inches 80% > 6 inches 3 inches 6 inches Min Thickness ASTM D 6525 0.25 inch 0.25 inch 0.25 inch 0.25 inch Net Opening Minimum (inch) 0.5 × 0.5 0.75 × 0.75 0.5 × 0.5 0.75 × 0.75 Max Shear Stress @ 0.50 inches soil loss ASTM D 6460 N/A 1.50 lbs/sf 1.50 lbs/sf 1.75 lbs/sf Slope Gradient Application ≤ 3H:1V < 3H:1V - 2H:1V ≤ 2H:1V < 2H:1 - 1.5H:1V Net Backing Type Rapid Photodegradable Polypropylene Polypropylene Functional Longevity ≤ 3 months ≤ 12 months Min Machine Direction Tensile Strength ASTM D 6818 50 lbs/ft 75 lbs/ft
Referenced in this section
GALVANIZING in other states
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Source: North Dakota Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 482–482 of 550. View official source ↗