Steel deterioration, including rust-jacking and delamination, has dominated these failure portraits so far, and the trend continues today.
That is amazing. The beam was fully exposed, so the delimitation was able to take place with nothing holding the sheets of rust in place. (And of course, no rust-jacking, since the rust had nothing to push against.)
We assume that rust occupies a volume some 6 to 8 times thicker (in the direction that the delamination is moving) than unsuited steel. In this case, it may be even bigger as the rusts sheets fanned out.
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