Section 722 — Anchor Material

722.01Anchorage Devices. Galvanize anchorage device components according to AASHTO M 232 .

722.02Anchor Tendons. Provide material conforming to the following:

(a)Prestressing steel. Conform to one of the following:

(1)Wire, uncoated stress -relieved for prestressed concrete ASTM A421

(2)Steel strand, uncoated seven -wire stress- relieved for prestressed concrete AASHTO M 203

(3)Steel strand, uncoated, seven- wire, compacted, stress- relieved for prestressed concrete ASTM A779

(4)Uncoated high- strength steel bar for prestressed concrete AASHTO M 275

(b)Couplers. Provide couplers that can develop 95 percent of the minimum specified ultimate tensile strength of the tendon.

(c)Sheathing. Conform to one of the following:

(1)Free- stressing length.

(a)Polyethylene plastic tubing. Conform to ASTM D1248, Types II, III, or IV with a minimum wall thickness of 60 mils.

(b)Hot-melt extruded polypropylene tubing. Conform to ASTM D4101, cell classification PP 210 B5554211 with a minimum wall thickness of 60 mil s.

(c)Hot-melt extruded polyethylene tubing. Conform to ASTM D3350 and ASTM D1248 Type III high -density with a minimum wall thickness of 60 mils.

(d)Steel tubing. Conform to ASTM A500 with a minimum wall thickness of 0.20 inch.

(e)Steel pipe. Conform to ASTM A53, Schedule 40 minimum.

(f)Plastic pipe. Conform to ASTM D1785, Schedule 40 minimum.

(2)Bonded length.

(a)High -density corrugated polyethylene tubing. Conform to AASHTO M 252 with a minimum wall thickness of 30 mils.

(b)Corrugated, polyvinyl chloride tubes. Conform to ASTM D1784, Class 13464- B.

(c)Fusion- bonded epoxy. Conform to ASTM A775 with a minimum film thickness of 15 mils. 863 (d) Corrosion inhibiting compounds. Use grease conforming to PTI, Recommendations for Prestressed Rock and Soil Anchors.

(e)Centralizers and spacers. Fabricate centralizers and spacers from material, except wood, that are not deleterious to the prestressing steel.

(f)Anchorages. Provide material conforming to PTI, Recommendations for Prestressed Rock and Soil Anchors . For strand tendons, provide anchorages that allow lift -off testing without the jack engaging the strand. Provide steel plates conforming to ASTM A36 or ASTM A588 for bearing plate s. Provide grout tube holes in the bearing plates.

722.03Rock Bolts and Rock Dowels.

(a)Bars. Provide continuously threaded steel reinforcement bars that conform to ASTM A615 Grade 75 deformed bars. The bending requirements of ASTM A615 do not apply. Provide rock dowels with a minimum No. 7 bar size. For rock bolts, Grade 150 threaded steel reinforcement bars meeting the requirements of ASTM A722 Type II, or AASHTO M 275 Type II that can be post- tensioned to the design loads, performance test loads, and proof loads specified are also allowed.

(b)Hardware. Provide the following:

(1)Bearing plates. Provide bearing plates that conform to PTI, Recommendations for Prestressed Rock and Soil Anchors for the respective application.

(2)Nuts and couplers. Provide nuts and couplers that exceed 100 percent of the MUTS of the bar. Provide nuts and couplers meeting ASTM A563, AASHTO M 169 or ASTM A108, ASTM A536, or ASTM A29.

(3)Washers. Provide washers conforming to ASTM F436. Provide spherical and beveled washers conforming to ASTM A536 and ASTM A47.

(4)Centralizers. Fabricate centralizers from materials that are not deleterious to steel bars. Do not use wood.

(c)Corrosion protection. Provide anchor bars and hardware with hot -dip galvanizing for corrosion protection as applicable. Use hot -dip galvanizing conforming to AASHTO M 232, ASTM A153 , or ASTM F2329 with a minimum thickness of 3.4 mils. Provide corrosion protection for steel anchor bars and hardware, from delivery of materials through complete installation, repairing damaged galvanizing according to Section 563.

(d)Rock bolt bond breakers. Provide a grease that conforms to PTI, Recommendations for Prestressed Rock and Soil Anchors. Provide sleeved bond breakers for rock bolts fabricated from plastic tube or pipe having the following properties:

(1)Resistant to chemical attack from aggressive environment, grout, or corrosion inhibiting compound;

(2)Resistant to aging by ultra- violet light;

(3)Non-detrimental to rock bolts;

(4)Resistant to damage caused by abrasion, impact, crushing, and bending during handling and installation;

(5)Enables rock bolts to elongate during testing; and

(6)Resistant to distortion caused by heat generated by the curing of the grout. Table 722-1 Wall Thickness Requirements for Sleeved Bond Breakers

Type Nominal , inch Minimum , inch

HDPE and

Polypropylene 0.060 0.050 PVC 0.040 0.035

722.04Soil Nails.

(a)Tendon. Provide deformed bars conforming to one of the following:

(1)Deformed bars, Grade 60 or Grade 75 ASTM A615

(2)Deformed bars ASTM A722 Provide new, straight, continuous, undamaged bars. Provide, bare, epoxy- coated, or encapsulated bars.

(b)Coupler. Provide couplers that can develop the full, ultimate tensile strength of t he tendon as certified by the manufacturer.

(c)Fusion bonded epoxy coating. Apply epoxy coating conforming to ASTM A775, except for the bend test requirements. Electrostatically apply the coating to a minimum thickness of 12 mils. The coating at the wall anch orage end of epoxy- coated bars may be omitted over the length provided for threading the nut against the bearing plate. (d) Encapsulation. Provide corrugated polyethylene pipe conforming to AASHTO M 252 or corrugated polyvinyl chloride pipe conforming to ASTM D1784, Class 13464.

722.05Anchor Nails. Provide 1¼- inch diameter, high strength steel, hollow -core, self -drilling, anchor nails with corrosion protection that conforming to ASTM A615 and come supplied with a 3- inch diameter sacrificial bit. Provide nails with corrosion protection conforming to ASTM A153 for hot -dip galvanizing. Provide nails that are groutable and can be post tensioned to a design load of at least 10,000 pounds and an ultimate strength of at least 55,000 pounds. 865 722.06 Micropile Materials.

(a)Tendon. Provide deformed bars conforming to one of the following:

(1)Deformed bars, Grade 60 and Grade 80 AASHTO M 31

(2)Deformed bars AASHTO M 275 Provide new, straight, continuous, and undamaged bars.

(b)Coupler. Provide couplers that can develop the full, ultimate tensile strength of the tendon as certified by the manufacturer.

(c)Fusion bonded epoxy coating. Apply epoxy coating conforming to ASTM A775, except for the bend test requirements. Electrostatically apply the coating to a minimum thickness of 12 mils. Do not epoxy coat bearing plates and nuts encased in the concrete footing unless footing reinforcement is epoxy coated.

(d)Encapsulation. Provide corrugated polyethylene pipe conforming to AASHTO M 252 or corrugated polyvinyl chloride pipe conforming to ASTM D1784, Class 13464. (e) Sheathing. Provide watertight smooth polyvinyl chloride sheathing conforming to ASTM D1784, Class 13464- B.

722.07Rockfall Protection Anchor Materials .

(a)Hollow -core self -drilling anchors. Provide 1.25-inch hollow -core, threaded, deformed steel bar, self-drilling anchors conforming to ASTM A513 and A519. Include a sacrificial drill bit at least 3-inch diameter.

(b)Wire rope anchors. Provide ASTM A1023 galvanized, stranded carbon steel wire ropes. Provide double- legged wire rope anchors in the sizes and with minimum breaking strengths to provide the working loads specified. Provide 6x19 classification IWRC made from EIP steel with a factory -installed swage- eye terminal on the distal end of the wire rope, possessing ferrules, thimbles, or wire clips as required by the manufacturer.

(c)Threaded bar ground anchors. Provide 1- inch diameter deformed continuously threaded bars. Provide a minimum Grade 60 steel deformed continuously threaded bars and couplers conforming to ASTM A615 and ASTM A775 or AASHTO M 111.