looks like not enough rebar, which should have been A706 (more flexible type), I could not see any additional larger bars or sheer studs over the columns to resist moment stress of punching and sheer (doesnt mean they werent there just saw none), I also noticed the lack of bonding to the rebar wich could be beacuase the concrete was not mature, before the concrete gets strong it just falls away from the bar when demo'd, or could be contamination by form oil or road dust if was stored in a dirty place and not washed off which would require a third party inspector to enforce, (theres no way most contractors would care, workers just spray form oil all over bar if not called out)
concrete fractured as if it was immature. It seems highly unlikely to me that any concrete could reach enough strength in 5 days to resist that much flexural stress. They would have had to import a huge amount of rare Type 5 cement and bring in some strong rock used in a high proportion of the mix design in order to get that kind of true high-early strength, I somehow doubt any of that happened and even then it should have remained re-shored for at least 30 days, there is no excuse for that they could have closed a few lanes to accomodate shoring. I would guess local rock is non-existent in Florida and it gets shipped in on trains, but there sure is a lot of sand which the ready mix plants probably push the limits with. I suppose MCM has done this before and got lucky.
Is it normal to do these sets without stopping traffic under the bridge?
Cracks were spotted Email was not received until after the fall