HomeLatest ThreadsGreatest ThreadsForums & GroupsMy SubscriptionsMy Posts
DU Home » Latest Threads » Forums & Groups » Main » General Discussion (Forum) » Bay Bridge Will Learn Its... » Reply #12

Response to FarCenter (Reply #10)

Tue May 7, 2013, 02:32 PM

12. The bolts exceded CalTrans specifications - and that may be the problem

Retired Bechtel metallurgist Yun Chung offered up a 32-page report last week stating that Caltrans engineers "were ignorant to the threat of hydrogen embrittlement a process in which high strength metals, such as steel, become brittle and fracture due to hydrogen exposure." The type of steel used in manufacturing the bolts, he said, was more hard on the outside than is required in Caltrans own specifications, and that the state's engineers were only focused on hydrogen exposure during the manufacturing, and not on exposure to the elements, which he believes caused them to become brittle and snap. Chung's findings have been vetted by other experts, who agree.


http://sfist.com/2013/04/28/things_looking_even_worse_with_thos.php

Reply to this post

Back to OP Alert abuse Link to post in-thread

Always highlight: 10 newest replies | Replies posted after I mark a forum
Replies to this discussion thread
Arrow 14 replies Author Time Post
marmar May 2013 OP
burnodo May 2013 #1
Le Taz Hot May 2013 #5
Warren DeMontague May 2013 #8
burnodo May 2013 #13
Warren DeMontague May 2013 #14
dixiegrrrrl May 2013 #2
Brother Buzz May 2013 #3
dixiegrrrrl May 2013 #6
Brother Buzz May 2013 #7
dixiegrrrrl May 2013 #9
eissa May 2013 #4
FarCenter May 2013 #10
LineLineNew Reply The bolts exceded CalTrans specifications - and that may be the problem
Brother Buzz May 2013 #12
Arugula Latte May 2013 #11
Please login to view edit histories.