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3.Inspect one hundred percent of all circumferential welds an d the full penetration sections of the longitudinal seam welds by radiographic examina tion (RT). Inspect one hundred percent of tube to plate welds: full penetration by RT, partial penetration and fillet by MT. Inspect twenty five percen t of the partial penetration s ections of the longitudinal seam welds (MT). Ultrasonic testing (UT) may be used on materi al ≥ (5/16 inch) thick and properly qualified UT may be used on thicknesses < 5/16 inch.
504.65 Method of Measurement Unless otherwise specified, struc tural steel will be
measured as one lump sum complete and accepted, consisting of a ll metal and related materials in the fabricated and erected structure as shown on t he Plans, excluding railings and drains. Related materials shall include, but not be limite d to, preformed pads placed under the bearings and, when required, self-lubricating bronze or copper-alloy bearing and expansion plates.
504.66 Basis of Payment Structural steel will be paid for at t he contract lump sum price
for the respective contract items. Payment will be made under: Pay Item Pay Unit
504.70 Structural steel fabricated and delivered, L u m p S u m
504.701 Structural steel fabricated and delivered, roll Lum p Sum 504.702 Structural steel fabricated and delivered, welded Lu mp Sum
504.71 Structural steel erection L u m p S u m
SECTION 505 - STUD WELDED SHEAR CONNECTORS, ANCHORS, & FASTENER S
505.01 Description This work consists of furnishing and instal ling steel stud welded
shear connectors, concrete anchors and threaded fasteners in ac cordance with the AASHTO/AWS D1.5 Bridge Welding Code (D1.5) and these Specificat ions.
505.02 Materials Materials shall meet the requirements of Sect ion 711.06 - Stud Shear
Connectors, Anchors, and Fasteners. The Contractor shall provi de the stud manufacturer’s certification that the studs meet the material requirements pri or to beginning welding.
505.03 Quality of Work The studs shall be free from rust, scal e, oil, and other
contaminants that would adversely affect the welding operation. Weld locations shall be free of scale, rust, oil and other dele terious material. The Contractor may clean the wel d locations by any method that resu lts in satisfactory welds. 5-87 The arc shields, or ferrules, shall be kept dry. Ferrules show ing signs of moisture shall be oven dried at 250 degrees Fahrenheit for two hours prior to use. The longitudinal spacing of shear connectors shall vary no more than ±1 inch from that shown on the Plans. The minimum edge distance shall be 2 inche s. Arc shields or ferrules shall be removed from studs after weldi ng.
505.04 Technique Studs shall be welded with automatically time d stud welding
equipment connected to a suitable direct current, electrode neg ative (DCEN) power source. If more than one stud-welding gun is operated from the same pow er source, they shall be interlocked so that only one gun can operate at one time. Welding shall not be done when the base metal temperature is be low zero degrees Fahrenheit or when the surface is wet or exposed to rain or sno w. Studs may be fillet welded using S MAW with the approval of the Resident.
505.05 Construction Requirements At the beginning of each day or shift and after any
change in set-up, the first tw o studs welded shall be tested. The studs shall be visually inspected for a full 360 degrees weld flash. The studs shall b e bent a minimum of 30 degrees from their original axis with a hammer, pipe or other h ollow device. If either stud fails the visual or bend test, the Contractor shall correct the procedure and weld two more studs to separate material representative of the grade and thic kness of the material being welded in production. This procedure shall continue on separat e plates until the Contractor has successfully welded two consecutive studs. While in operation, the welding gun shall be held in position w ithout movement until the weld metal has solidified. If an unacceptable stud has been removed from an area subject t o tensile stresses or stress reversal, the weld area shall be ground flush. If base metal has been pulled out in the course of stud removal, the pocket shall be filled by welding i n accordance with the field welding requirements of Section 504 - Structural Steel. The we ld shall be ground flush. Base metal repairs in compression areas shall be the same as th e repairs for tension areas except that if the depth of the pocket is less than ⅛ inch it s hall be faired out by grinding. Replacement studs shall be welded no closer than 1 inch from th e repair area. 505.051 Inspection Studs will be visu ally inspected for a full 360 degrees weld flash. Studs not having a full 360 degrees weld collar shall be bent 3 0 degrees from its original position in a direction away from the missing weld flash. Stud s not developing a crack or tear will be considered acceptable. Failing studs shall be rem oved, replaced and weld areas repaired. 5-88
505.06 Method of Measurement Shear connectors shall be measure d as one lump sum,
consisting of all shear connectors required and acceptably inst alled. Stud welded anchors and fasteners will be considered incidental to the pay item for which they are required.
505.07 Basis of Payment The accepted quantity of shear connect ors will be paid for at
the lump sum price. Payment will be made under: P a y I t e m Pay Unit
505.08 Shear Connectors Lump Sum
SECTION 506- SHOP APPLIED PROTECTIVE COATING - STEEL
506.01 Description This work shall consist of applying protect ive coating to steel
substrate in accordance with the Plans and this Specification. The protective coating system shall be as specified on the Plans. ALL REQUIREMENTS IN THIS SPECIFICATION ARE THE RESPONSIBILITY O F THE CONTRACTOR UNLESS NOTED OTHERWISE.
506.02 Materials Materials shall comply with the requirements of the respective
Subsections of this Specification.
506.03 Submittals Submit the following, as applicable:
A.The manufacturer's product data sheet for the specified prot ective coating system(s).
B.Material Safety Data Sheets. C. Facility Certification, Endorsement or other Qualification(s )
D.Quality Control Plan E. Quality Control Inspector (QCI) qualifications
506.04 General Specifications Specifications for the protectiv e coating and/or protective
coating systems are: Zinc Rich Coating System Subsections 506.10 through 506.19 H o t - D i p G a l v a n i z i n g S u b s e c t i o n s 506.20 through 506.29 T h e r m a l S p r a y C o a t i n g S u b s e c t i o n s 506.30 through 506.39 Fusion Bonded Epoxy Coating Subsections 506.40 through 506.49 506.05 Inspection Quality Control (QC) is the responsibility o f the Contractor. Inspect all aspects of the work and supervise all sampling, measurement s and testing. Record measurements and test results in a clear and legible manner in a format acceptable to the Fabrication Engineer. Reject mat erials and workmanship that do not meet Contract
Source: Maine Standard Specifications for Road and Bridge Construction, 2020 Edition. Pages 378–380 of 817.