Hydrogen Embrittlement

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Preliminary 2010 Bolt Results No bolts have broken after more than a month of tensioning. Preliminary test results for 2010 bolts, including full sized destructive testing, show more ductile material properties and no hydrogen embrittlement. Additional testing results are anticipated, including surface hardness, toughness, microscopic examination, and corrosion testing 22
ASTM Requirements D>2 ½” 2008 E2 Bottom Average 2010 E2 Bottom Average E2 Shear Key Top Average ASTM Requirements D = ¼” to 2 ½” E2 Bearing Top Average E2 Bearing Assembly Average E2 Retaining Ring Average Tensile (KSI) Yield (KSI) Elongation (%) Reduction of Area (ROA) Hardness (HRC) Charpy Toughness (ft-lb) 140 (min) 115 (min) 14 (min) 40 (min) 31-39 N/A 164 142 14 48 37 @40° - 13.5 @70° - 16.2 159 139 16 51 34 @40° - 37.2 @70° - 37.7 159 141 16 46 35 N/A 150 (min) 130 (min) 14 (min) 40 (min) 33-39 N/A 161 135 16 54 35 N/A 166 154 18 56 36 N/A 166 148 16 50 35 N/A Post Heat Treatment QC/QA Mechanical Tests at E2 23
Page 1 and 2: Briefing on E2 Anchor Bolts - May 8
Page 3 and 4: Pier E2 3
Page 5 and 6: Toll Bridge Program Oversight Commi
Page 7 and 8: FHWA Independent Review The TBPOC
Page 9 and 10: B1 S1 B2 S3 S4 B3 S2 B4 • Bearing
Page 11 and 12: Tension Hydrogen Embrittlement Hydr
Page 13 and 14: Report Recommendation Procurement
Page 15 and 16: 2. What retrofit strategy should be
Page 17 and 18: Option 2 - Steel Saddle 17
Page 19 and 20: Selection of Option 2 - Saddle Bot
Page 21: B1 S1 B2 S3 S4 B3 S2 B4 • 96 bolt
Page 25 and 26: Long term stress corrosion suscepti
Page 27 and 28: • Visual inspections of similar b
Page 29 and 30: Other Toll Bridges As part of this

Hydrogen Embrittlement

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