7-42 Steel for ancillary bridge products and steel structures shall conform to AASHTO M 270 or one or more of the following: ASTM A 36 ASTM A 572 ASTM A 588 ASTM A 53 ASTM A 500 ASTM A 595 Grade C ASTM A 786 ASTM A 847 ASTM A 992 Ancillary bridge products shall be as described below: (a) bearings (b) drainage components (c) expansion devices (gland seal, compression seal, finger jo int)
d.modular expansion devices (e) steel bridge rail (f) catwalks and inspection walkways 713.02 High Strength Bolts Bolts shall conform to the requirem ents of ASTM F3125, Grade A 325, Type 1 or Type 3. Type 3 bolts shall be supplied for all structures utilizing unpainted AASHTO M 270Mweathering steel. Nuts shall meet the requirement s of AASHTO M 291 or AASHTO M 29 2. Circular and beveled washers shall conform to the requirements of AASHTO M 293. Direct Tension Indicators (DTI’S) shall conform to the requirem ents of ASTM F 959. DTI’s for use with painted steel shall have a plain “as fabrica ted” finish. DTI’s for use with unpainted steel shall be galvanized to the requirements of AASH TO M 298 Class 50, Type I and have a fusion-bonded epoxy coating. DTI’s used with galvan ized steel, metalized steel and steel coated with a zinc-rich primer shall be galvanized to the requirements of AASHTO M 298 Class 50, Type I. “Twist Off” Type Tension Control Structural Bolt/Nut/Washer Ass emblies shall meet the requirements of ASTM F3125, Grade F1852. Bolts, nuts and washers specified to be galvanized may be galva nized by either hot dip galvanizing to the requirements of AASHTO M 232 Class C or mech anically galvanized to the requirements of AASHTO M 298 Class 50, Type I. All fastener (bolts and nuts), whether black or galvanized, sha ll be coated with a suitable lubricant. Galvanized nuts sha ll be lubricated with a lubrican t containing a visible dye. 7-43 Each lot of bolts, nuts, washers and DTI’s shall be tested by t he manufacturer in accordance with the tests tabulated in Table 1 - Test Schedule. The testing frequency for bolts, nuts and washers from each shipping lot of fasteners sha ll be as specified in the applicable AASHTO/ASTM Standar d Specifications. The testing fr equency for each production lot of DTI’s shall be as specified in ASTM F 959. TABLE 1 - Test Schedule* Bolts Tensile Strength (Wedge Test) Proof Load Hardness Coating Thickness ASTM F 606 ASTM F 606 ASTM F 606 AASHTO M 298 Nuts Proof Load Hardness Coating Thickness ASTM F 606 ASTM F 606 AASHTO M 298 Washers Hardness Coating Thickness ASTM F 606 AASHTO M 298 DTI’s Coating Thickness Compression Load AASHTO M 298 ASTM F 959 *The supplier(s) shall submit test reports for all testing requ ired in this Table. Test reports shall contain, in addition to the test results, the name and ad dress of the testing agency, the manufacturer, lot tested, and Mill Test Reports for all steel u sed in the manufacture of the fastener assemblies and DTI’s. The supplier shall perform, or cause to be performed a Rotation al Capacity Test (RCT) for every production lot combination of bolts, washers and nuts . Each combination shall be designated with a unique RCT lot number. The test results shal l be furnished to the Engineer.
713.03 Preformed Pads Preformed pads shall be made with new un vulcanized rubber
and unused fabric fibers and sha ll be approximately ⅛ inch thic k after compression and vulcanizing with a proportion of fiber content sufficient to ma intain strength and stability. The surface hardness shall be 85 to 95 Shore A Durometer. The ultimate breakdown limit of the pad under compressive loading shall be no less than 10,0 00 psi.
713.04 Bronze or Copper-Alloy Bearing and Expansion Plates Br onze bearing and
expansion plates shall conform t o the requirements of AASHTO M 107 (ASTM B 22), Alloy No. 911 and copper alloy bearing and expansion plates sha ll conform to the requirements of AASHTO M 108, (ASTM B 100) Alloy No. 510 or 511 , unless otherwise specified. The bearing surface(s) subject to sliding action sh all be provided with trepanned recesses (not grooves) filled with a lubricating compound. The lubricating compound shall consist of graphite and metallic substances with a lubricating binder capable of withstanding the atmospheric elements. The compound shall be pressed into t he recesses to form dense, non-plastic lubricating inserts. The lubricating area shall comprise between 25 percent and 35 p ercent of the total area of the plate subject to sliding action. The sliding surface(s) shall be planed parallel to the 7-44 prevailing direction of movement of the structure and subsequen tly polished, unless detailed otherwise.
713.05 Cold-finished Carbon Steel S hafting Cold-finished carb on steel shafting
shall conform to the requirements of AASHTO M 169. Grade Desig nation 1021-1030 inclusive, cold drawn, either semi-killed or fully-killed, shal l be furnished unless otherwise specified.
713.06 Castings Gray iron castings, for use other than for dr ainage castings,
(Section 712.07) shall conform to the requirements of AASHTO M 105. Class Number 35 shall be furnished unless otherwise specified. Malleable iron castings shall conform to the requirements of A STM A 47. Grade Number 32510 shall be furnished unless otherwise specified. Carbon-Steel Castings for General Applications shall conform t o the requirements of AASHTO M 103. The grade 70-36 of steel shall be used unless ot herwise specified. Castings shall be true to pattern in form and dimensions, free from pouring faults, sponginess, cracks, blow holes and other defects in positions a ffecting their strength and value for the service intended. Castings shall be boldly filleted at angles and the arrises sh all be sharp and perfect. All castings must be sand blasted or otherwise effectively cle aned of scale and sand to present a smooth, clean, and uniform surface.
713.07 Metal Bin Type Retaining W all The metal for bin type r etaining wall
members shall be galvanized and shall conform to the applicable requirements of AASHTO M 36. When fiberglass, aramid or carbon graphite fiber coating is sp ecified, the galvanized metal sheets used to form the retaining wall, except the base p lates and connecting channels, shall additionally be coated on both sides with a layer of fibe rglass, aramid or carbon graphite fibers applied in sheet form by pressing it into the m olten spelter. Immediately after the metallic bond has solidified the fibers shall be thor oughly saturated with a bituminous saturant conforming to the following requirements: Penetration at 77 °F, 3.5 oz, 5 sec. 0.14 - .018 inches Loss on heating at 325°F, 1.75 oz, 5 hrs Not more than 1.5 percent Flash point (open cup) Not less than 440°F Penetration at 77 °F, 3.5 oz, 5 sec., of residue after heating at 325°F, as compared with penetration of asphalt before heating Not less th an 70 percent Insoluble in carbon disulfide Not more than 2 percent 7-45 Testing shall be in accordance with methods specified in AASHTO M 20. Whenever possible in the manufacture of the units, a minimum f orming radius of 1 inch is to be maintained. All units that are formed with less than 1 inch radius shall be hot- dipped galvanized after forming. Bolts shall conform to the requirements of ASTM F 568 Class 4. 6 (ASTM A_307) and galvanized in accordance with AASHTO M 232.
713.08 Steel Extrusions Material for steel extrusions for exp ansion devices shall be
ASTM A 36/A 36M, ASTM A 588/A 588M, or ASTM A 242/A 242M, excep t that ASTM A 242/A 242M shall not be used for e xtrusions that are to be we lded. SECTION 714 - JOINT SEALS
714.01 Elastomer for Seal Elements The preformed elastomeric polychloroprene
joint seal elements, both compression and gland type, shall con form to the requirements of AASHTO M 297.
714.02 Fabric for Seal Elements Fabric used for reinforcement in a seal element
shall be a non-wicking fabric c onforming to the requirement of ASTM D 578.
714.03 Lubricant Adhesive The lubricant-adhesive shall be a 1 part, moisture
curing, polyurethane and aromatic hydrocarbon solvent mixture a nd shall have the following physical properties: Solids content 60-80 percent by weight Service Range 5°F to 120°F minimum Film Strength (ASTM D 412) 1,200 psi minimum Elongation at Break 250 percent minimum Each lot of lubricant-adhesive shall be delivered in sealed co ntainers plainly marked with the manufacturer's name or trademark and the date of manuf acture. Maximum shelf life shall not exceed 6 months.
714.04 Sealant The sealant shall be a one part, moisture curin g, polyurethane base, non-
sag, elastomeric product, conformi ng to the requirements of Fed eral Specification TT-S- 0023OC(2), Type II, Class A or A STM C920, Type S, Grade NS, Cla ss 25. Each lot of sealant shall be delivered in sealed containers pl ainly marked with the manufacturer's name or trademark and the date of manufacture. Maximum shelf life shall be as recommended by the manufacturer.
Source: Maine Standard Specifications for Road and Bridge Construction, 2020 Edition. Pages 747–750 of 817.