N eutroN I magINg of H ydrogeN IN a354 g rade Bd S teel a NcHor r odS - PowerPoint PPT Presentation

N eutroN I magINg of H ydrogeN IN a354 g rade Bd S teel a NcHor r odS by Lisa Thomas, P .E. Metallurgist, Berkeley Research Company

m eaSure H ydrogeN c oNceNtratIoN To assess the risk of environmental hydrogen embrittlement cracking to other A354 Grade BD anchor rods do this... Measure H concentration in the failed rods, near the fracture and in the top ends

NIST Center for Neutron Research Neutron Tomography Gamma-Ray Activation generate 3D maps of hydrogen concentration across the entire rod cross-section Dr. Daniel Hussey NIST scientists: Dr. Thomas H. Gnaeupel-Herold Dr. Rick L. Paul Dr. Richard M. Lindstrom Dr. David L. Jacobson

a ll t Hat IS r equIred : specimens from both ends of the S1 & S2 rods & from any other rods that are available 3-millimeter thick discs

“W a s HE c r ac k i n g E xc lu s i v E to co r ro s i o n o f b ot to m t H r E a d s ?” H gradIeNt IN top eNdS vs. H gradIeNt IN Bottom eNdS informs tHE managEmEnt stratEgy of otHEr rods

In Closing... These studies using neutron imaging to measure hydrogen content in A354 Grade BD steel fasteners of this size have not been done! It will be invaluable, not only for the SAS Bay Bridge but for infrastructure projects around the world! Thank You.