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I Doser Cracked All 356


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I Doser Cracked All 356


The section also has a cracking history that was never previously mentioned. The most recent cracking occurred in 1997, and it is unlikely that the bridge's current cracking was the result of any particular event. The cause, if there is one, is unclear. Al-Zahrani believes that the cracking may have been caused by the movement of the bridge, but it is more likely that such damage occurred gradually, over decades, through ordinary aging processes. The cracking has spread for more than a century along the length of the bridge.


Researching the cracking has been one of the most interesting things I've done in my career, Al-Zahrani says. I'm really concerned that as bridge engineers, there's not enough attention paid to determining what the roots of bridge damage are. How does bridge cracking start Is there something we can do about it


This is not an exceptionally strong bridge or an especially long bridge. It's a typical concrete bridge over a typical freeway, in a part of the country where this kind of cracking has been observed before.


The presence of aluminum and beryllium in a concrete bridge deck is an issue that has been raised repeatedly over the years. But sources of contamination differ: first, in the 1970s, it was thought that beryllium contamination came from a product called soluble beryllium, manufactured by Dow Chemicals, because of the manufacture of beryllium for nuclear research. That's not the case. The root causes are probably twofold. Aluminum causes cracking by its particular chemistry. And beryllium might have contributed to cracking by being on the bridge in the first place. In the 1970s, the deck was tested for beryllium, but many bridges had been built on the site, and remediation may have been incomplete. 3d9ccd7d82






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