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From page 19... ... 19 Alternatives The steel industry has developed corrosion-resistant steels as an alternative to protective coatings for uncoated use in bridges and other highway structures. Uncoated steel bridge designs are considered cost-effective because the maintenance/replacement of paint coatings is eliminated. Read the entire page →
From page 20... ... 20 Corrosion Prevention for Extending the Service Life of Steel Bridges Stainless Steels Stainless steel refers to a family of ferrous alloys containing a minimum of 10.5% chromium. Alloys containing this minimum amount of chromium tend to form a passive chromium-rich oxide in oxidizing environments (Baddoo 2013; Gedge 2007) Read the entire page →
From page 21... ... Corrosion Control of Uncoated Steel Bridges 21 low-alloy steels. In initial experiences with ASTM A1010 materials during bridge construction, both the Virginia and Oregon DOTs found welding to be a challenge (Seradj 2015; Sharp et al. Read the entire page →
From page 22... ... 22 Corrosion Prevention for Extending the Service Life of Steel Bridges Duplex stainless steels have been used in bridge structures for a wide range of applications. Table 6 shows a list of several bridges constructed between the years 1999 and 2011 with duplex stainless steel structural elements (Baddoo and Kosmac n.d.; Kuchta and Tylek 2013) Read the entire page →
From page 23... ... Corrosion Control of Uncoated Steel Bridges 23 Date Name and Location Type of Bridge Duplex Stainless Steel Components and Grade 1999 Punt da Suransuns Bridge, Switzerland Stress ribbon pedestrian bridge; 131-ft span Four structural ribbons S32205 2001 Millennium Bridge, York, United Kingdom Tilted box girder arch pedestrian bridge; 262-ft main span Arch S32205 2002 Bridge Apatê, Stockholm, Sweden Tied-beam pedestrian bridge Main girder S32205 2003 Kungalv Bridge, Kungalv, Sweden Arch rail bridge, upgrade Replacement of corroded carbon steel deck hangers (after 8 years' service) S32205 2003 Pedro Arrupe Bridge, Bilbao, Spain Box girder pedestrian bridge; total length 459 ft Box girder with carbon steel internal structure S32304 2004 Likholefossen Bridge, Forde, Norway Lightweight pedestrian bridge; 79-ft span All except concrete columns S32101 Continuous prestressed concrete road bridge; length 3,465 ft, 459-ft maximum span 2004 Viaduct Č rni Kal, Slovenia Wind barrier from tubular sections (110 tons) Read the entire page →
From page 24... ... 24 Corrosion Prevention for Extending the Service Life of Steel Bridges the metals to prevent galvanic corrosion (Kulicki et al. Read the entire page →
From page 25... ... Corrosion Control of Uncoated Steel Bridges 25 Figure 15. Typical framing for weathering steel bridges in Iowa. Read the entire page →
From page 26... ... 26 Corrosion Prevention for Extending the Service Life of Steel Bridges Figure 17. Typical detailing for weathering steel bridges in Iowa. Read the entire page →
From page 27... ... Corrosion Control of Uncoated Steel Bridges 27 Figure 19. Typical detailing for weathering steel bridges in Iowa. Read the entire page →
From page 28... ... 28 Corrosion Prevention for Extending the Service Life of Steel Bridges Figure 21. FDOT weathering steel I-girder details (1 of 2) Read the entire page →
From page 29... ... Corrosion Control of Uncoated Steel Bridges 29 The Texas Department of Transportation (TxDOT) requires the use of drip plates on all weathering steel beams and girders to reduce or eliminate staining on concrete substructure. Read the entire page →
From page 30... ... 30 Corrosion Prevention for Extending the Service Life of Steel Bridges of wetness or exposure to high chloride concentrations (Crampton et al. 2013; Albrecht and Naeemi 1984; FHWA 1989) Read the entire page →
From page 31... ... Corrosion Control of Uncoated Steel Bridges 31 Bridge sites in marine coastal areas may contain air with higher-than-normal chloride concentrations that may prevent the protective patina from forming (Crampton et al. Read the entire page →
From page 32... ... 32 Corrosion Prevention for Extending the Service Life of Steel Bridges In heavy industrial areas, the air may contain chemicals such as nitrogen or sulfur compounds that can deposit on and decompose uncoated weathering steel surfaces (FHWA 1989; Albrecht and Naeemi 1984) Read the entire page →
From page 33... ... Corrosion Control of Uncoated Steel Bridges 33 Decision Process for Selecting Corrosion-Resistant Materials Selecting the construction material for a bridge includes considerations for the environmental conditions, service environment, service life, economics (installed cost and LCC) , and aesthetics. Read the entire page →
From page 34... ... 34 Corrosion Prevention for Extending the Service Life of Steel Bridges (Fletcher 2011) Read the entire page →
From page 35... ... Corrosion Control of Uncoated Steel Bridges 35 girders to divert runoff ahead of abutments and piers to control potential staining (Iowa DOT Office of Bridges and Structures 2017) Read the entire page →
From page 36... ... 36 Corrosion Prevention for Extending the Service Life of Steel Bridges Corrosion Maintenance of Uncoated Steel Bridges Proper inspection and maintenance of uncoated steel bridges ensures the bridges meet their expected service life. The FHWA recommends the following maintenance activities (FHWA 1989) Read the entire page →
From page 37... ... Corrosion Control of Uncoated Steel Bridges 37 Inspection Effective inspections should be implemented to evaluate bridge performance and identify potential problem areas. Inspectors should recognize the unique nature of weathering steel and ASTM A1010 stainless steel and differentiate between the possible protective and unprotective oxides (Crampton et al. Read the entire page →
From page 38... ... 38 Corrosion Prevention for Extending the Service Life of Steel Bridges Appearance Index Rating Oxide Layer Thickness Description Rust Flake Size 1 >800 µm (>0.031 in.) Large swelling and laminated flaky layer >25 mm (1 in.) Read the entire page →
From page 39... ... Corrosion Control of Uncoated Steel Bridges 39 Patina Rating Condition Description Example Condition in Field Example Tape Test Specimen 8 Very Good Uniform color pattern, generally dark brown with some lighter reddish-brown, metallic and purple-brown spots. May be difficult to see small rust product clusters. Read the entire page →
From page 40... ... 40 Corrosion Prevention for Extending the Service Life of Steel Bridges Patina Rating Condition Description Example Condition in Field Example Tape Test Specimen 5 Fair Dark brown with black and some color variation. Blotchy with some salty or rusty stains. Read the entire page →
From page 41... ... Corrosion Control of Uncoated Steel Bridges 41 overlap areas and all steel below roadway joints (FHWA 1989) Read the entire page →

From page 19...

... 19 Alternatives The steel industry has developed corrosion-resistant steels as an alternative to protective coatings for uncoated use in bridges and other highway structures. Uncoated steel bridge designs are considered cost-effective because the maintenance/replacement of paint coatings is eliminated.