I watched a TV program about this project recently and it included info about the short time window they have with the concrete pour from when it leaves the plant to being placed. That core tells me those time constraints are causing them to short the time they used the vibrator to remove trapped air. I’d also question the adherence to the aggregate screening specification.
There are many vibrator heads still embedded in pours that cooked off too fast. It can happen in an instant.
If this is the only glitch then they're doing fine. Apparently it isn't and they aren't because the problems go way back to Panama's romantic personality based culture where years ago the Canal's procurement team rejected Bechtel's bid and gave it to the Madrid company's design that the canal pilots now say will never work. Panamanian concrete was always problematic, we always knew the stuff was dodgy but we could work around it. The way contractors would meet Canal specs was simply to say, subcontract 5K psi concrete so they could met the requirements for U.S. 3K psi concrete.
The tech/mechanical problems are easy, just do it over until it's done right. The real problem here is a people problem where them w/ family connections can simply take charge and nobody can stop them. Thing is that family connections don't help much when it comes to physical/mechanical realities.