487 ALASKA 2020 SECTION 710
710-2.01 BARBED WIRE . Meet AASHTO M 280, 12.5 gage wire, with 4- point round 14- gage
barbs, spaced at 5 inches, Class 1 coating.
710-2.02 WOVEN WIRE. Meet AASHTO M 279, Grade 60, Class 1 coating.
710-2.03 CHAIN LINK FABRIC. Meet AASHTO M 181, Type I (Class C or D coating), Type II, or
Type III, including fittings and hardware. Use 9- gage fabric wire, 2- inch mesh.
710-2.04 Metal Beam Rail.
1.W-Beam and Thrie Beam Guardrail. Meet AASHTO M 180, Class A, Type II.
2.Box-Beam Guardrail. Meet:
a.ASTM A500 Grade B , or
b.ASTM A501. Galvanize the rail per AASHTO M 111 after fabrication.
710-2.05 FENCE POSTS. Meet AASHTO M 181, Grade 1 or Grade 2, including rails and braces.
710-2.06 GUARDRAIL POSTS AN D BLOCKOUTS . Furnish posts and blockouts, as specified,
meeting the following requirements.
1.Wood Posts and Blockouts . Use timber with a stress grade of 1200 psi or more. Testing must meet the standards of the West Coast Lumber Inspecti on Bureau. Use timber for posts and blockouts that is either rough sawn (unplaned) or S4S with nominal dimensions indicated. Allowable size tolerance of rough sawn blockouts in the direction of the bolt holes is ±1/4 inch. Only one combination of post and blockout finish may be used for any one continuous length of guardrail. Treat all timber to meet Section 714.
2.Steel Posts and Blockouts . Meet the section and length specified or shown on the Plans. Use copper bearing steel when so specified. Use steel meet ing the requirements of ASTM A36 and galvanized per ASTM A123/A.
3.Synthetic Blockouts . Products made from alternate materials may be used if accepted by the FHWA for use on the National Highway System.
710-2.07 GUARDRAIL H ARDWARE. Meet AASHTO M 180. Galvan ize after fabrication fittings,
bolts, washers, and accessories meeting AASHTO M 111 or AASHTO M 232, whichever applies. Guardrail cable anchor assembly must conform to TF13 Guide to Standardized Roadside Hardware, designator FCA01, with the cable meeting AASHTO M 30, Type II, Class A.
710-2.08 WIRE MESH. Galvanized 2- inch mesh (poultry netting), 20 gage wire.
710-2.09 ANCHOR WIRE . Galvanized 9 gage steel wire.
710-2.10 PIPE COUPLI NGS. Galvanized nonrecessed, taper tapped, extra heavy couplings.
710-2.11 GUARDRAIL TERMINALS. W-beam shall meet requirements of AASHTO M 180,
Class A, Type II. Galvanize after fabrication. Components made from rolled pressed and forged shapes, castings, plates, bars, and strips shall meet the coating requirements of AASHTO M 111. Galvanize after fabrication. 488 ALASKA 2020 All hardware or fasteners supplied shall meet the coating requirements of AASHTO M 232. Provide one of the following terminal types, as shown on the plans, for single- rail W -beam guardrail. Design requirements: 31- inch top of rail height, 8- inch blockouts, W6 x 8.5 steel posts, 12ft-6in w -beam panels, and mid- span splice connection to run of rail.
1.Parallel Terminals :
a.Provide terminals meeting the following:
1.Crashworthiness: MASH -compliant Test Level 3 terminals
2.Length: 50 feet nominal effective length
3.End Offset: 0 to 2 feet (25:1 or flatter straight taper) Offset end as shown on the plans.
2.Buried in Backslope Terminal : Provide MASH -compliant Test Level 3 terminals. 489 ALASKA 2020 SECTION 711 CONCRETE CURING MATE RIALS AND ADMIXTURES
711-2.01 Curing Mate Rials.
Burlap Cloth made from Jute or Kenaf AASHTO M 182, Class 4 Sheet Materials for Curing Concrete ASTM C171 Liquid Membrane- Forming Compounds for Curing Concrete ASTM C309, Type 1- D Class B, except do not use compounds containing linseed oil.
711-2.02 Chemical Ad Mixtures.
Air-Entraining Admixtures AASHTO M 154 Water -Reducing Admixtures AASHTO M 194, Type A Set-Retarding Admixtures AASHTO M 194, Type B Set-Accelerating Admixtures AASHTO M 194, Type C Water -Reducing and Set -Retarding Admixtures AASHTO M 194, Type D Water -Reducing and Set -Accelerating Admixtures AASHTO M 194, Type E Water -Reducing Admixtures AASHTO M 194, Type F High Range Water -Reducing and Set -Retarding Admixtures AASHTO M 194, Type G Specific Performance Admixtures ASTM C494, Type S
Referenced in this section
Sections that cite this one
FENCE AND GUARDRAIL in other states
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Source: Alaska Standard Specifications for Highway Construction, 2020 Edition. Pages 515–516 of 584. View official source ↗