montreal roadway collapse, 2006
 

montreal roadway collapse, 2006
a report on the sept 2006 roadway collapse in montreal has been issued .many worked together to cause it !!
oh yea.. read the original thread at the time. salt liberally applied, especially to bridge decks which freeze much faster. crooked construction, you bet-ya the supreme court of canada ruled recently that due to the problems in the quebec construction industry, unions are required there. seems to me also that johnson the individual that lead this inquiry is some how connected to the ready-mix suppliers? its scary driving through montreal. a chloride case book.
see also the following links
montreal gazette report:
the johnson commission report is very interesting.
here's a photo of the lab test where the type of shear failure (through an non-shear reinforced cantilever slab failed) - simulating what happened:
and here is a photo of the actual failure (pretty close to the same thing):
and an end view looking head-on at a 3d recreation of the failure surface: