SECTION 815 – GEOGRI D REINFORCEMENT
815.01 DESCRIPTION. This section describes geogrid physical requirements for
reinforcement of subgrad e and aggregate bases.
815.02 GENERAL. Furnish geogrid, formed by a punch and drawn method, composed of
polypropylene or high-density polyethylene resins.
815.03 PHYSICAL REQUIREMENTS. Furnish geogrid conforming to the Required
Geogrid Properties Table. Required Geogrid Properties1, 2, 3 Property Test Method Required Value English Metric Strength at 2% Strain ASTM D 6637 410 lb/ft 6.0 kN/m Strength at 5% Strain ASTM D 6637 810 lb/ft 11.8 kN/m Ultimate Tensile Strength ASTM D 6637 1310 lb/ft 19.2 kN/m Minimum Opening Size4 Direct Measure 0.5 in 12.7 mm Maximum Opening Size5 Direct Measure 3.0 in 76.2 mm Junction Strength GASTM 7737-11 93% Ultimate tensile strength Ultraviolet Stability AS TM D 4355 70% at 500 hrs Separation ASTM D 422 D15 of aggregate above geogrid < 5 x D85 subgrade and D50 of aggregate ≤ 25 x D50 of subgrade. Otherwise use a separation geotextile with geogrid NOTES:
1.Acceptance of geogrid material shall be based on ASTM D 4759.
2.Acceptance shall be based upon testing of either conformance sample obtained using Procedure A of ASTM D 4354, or based on manu facturer's certificat ions and testing of quality assurance sample obtained us ing Procedure B of ASTM D 4354.
3.Minimum use value in weaker principal di rection. All numerical values represent minimum average roll value (i.e., test results from any sampled roll in a lot shall meet or exceed the minimum values in the table). Lot samples according to ASTM D 4354.
4.Minimum opening size must be ≥ D50 of aggregate above geogrid to provide interlock.
5.Maximum opening size must be ≤ 2 x D85 of aggregate above geogrid to prevent aggregate from penetrating into the subgrade 815-1 SECTION 816 WOVEN-WIRE FENCING MATERIALS
816.01 DESCRIPTION. This section covers the materials for use in construction of
woven-wire fences.
816.02 GENERAL. Galvanize all ferrous materials used in a complete installation of
fence, except aluminum coated fabric, aluminum coated posts and braces, or aluminum coated barbed wire. Galvanize all iron and steel hardware according to AASHTO M 232. Galvanize other components as designated. Where it is not practical to secure a specimen of measurable area or uniform thickness for determining the weight of zinc coating, ensure that all such galvanizing withstands 4 dips of the Preece Test as set out in ASTM A 239. Ensure that post caps and socket type brace connections are galvanized malleable iron, or other approved type, and designed to exclude moisture from inside posts or rails.
816.03 WOVEN WIRE FABRIC. Ensure that the woven wire fabric is either zinc-
coated steel or aluminum-coated steel. Provide the size and style of fabric specified in the Contract. Use zinc-coated steel fabric that conforms to ASTM A 116 and that has a Class 3 coating. Use aluminum-coated steel fabric that conforms to ASTM A 116.
816.04 BARBED WIRE. Use either zinc-coated steel, aluminum-coated steel, or
aluminum alloy. Use barbs of 4-point pattern spaced at intervals of 5 inches. The wire for barbs may be either round or half-round.
816.04.01 Zinc-Coated Steel. Conform to ASTM A 121. Use size 0.099-inch
diameter or heavier with Class 3 coating. The Department will allow high tensile strength barbed wire provided it conforms to ASTM A 121, and the following exceptions: (1) nominal diameter of 0.067 inch for the coated line wires and 0.057 inch for the coated barbs; (2) minimum weight of zinc coating of 0.75 ounces per square foot for line wires and 0.70 ounces per square foot for barbs; and (3) minimum tensile strength of 475 pounds for each individual strand of the line wire.
816.04.02 Aluminum-Coated Steel. Use either Type I or Type II conforming to
ASTM A 121. Use size 0.099 inch diameter or heavier.
816.04.03 Aluminum Alloy. Use 2 strands of 0.110 inch nominal diameter or heavier
wire strands having minimum tensile strength of 42,000 psi, minimum yield strength of 35,000 psi and minimum elongation of 10 percent.
816.05 BRACE WIRE. Conform to ASTM A 824 except provide a minimum weight of
coating of 0.6 ounce per square foot. Use size 0.148-inch nominal diameter or larger.
816.06 FABRIC TIES. Use either a minimum 0.109-inch nominal diameter galvanized
steel conforming to ASTM F 626, except ensure that the minimum weight of coating is 0.6 ounces per square foot, or 0.148-inch nominal diameter aluminum alloy.
816.07 Fence Posts and Braces.
816.07.01 Steel Posts and Braces. Conform to ASTM F 1043, ASTM F 1083, and
the Standard Drawings. When the Contract specifies a thermoplastic acrylic coating, apply a chromate conversion coating at the manufacturer’s recommended rate. Ensure that the coating is designed for pretreatment of galvanized coatings. After pretreating, electrostatically apply the thermoplastic acrylic coating with a minimum dry film thickness of 0.3 mils. 816-1
Source: Kentucky Standard Specifications for Road and Bridge Construction, 2019 Edition. Pages 601–601 of 718.