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Originally Posted by jollyburger
That guy who seemed to have a lot of inside information on Burrard Place said it was an engineering decision so it might have not been a "value" change per se? I mean wouldn't they have known the costs of the concrete and not change mid-construction if it was just to save money? He does say it was exponentially more expensive + didn't fit with their pour cycle.
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It is a "value"-related change, however you choose to characterize or word it.
It may have been the initial proposal - even with the Engineers' go-ahead and blessing to have it done in white concrete, because at the time they, (the engineers) - much like everyone else - were not aware of what the construction schedule would be like and when the pouring and curing for the concrete would occur.
Once it became clear that it would occur over the summer with high summer heat and all the cost increases and engineering deficiencies that would occur, and that that would entail, a decision was made to switch to grey concrete which cures better under those conditions, but more importantly which would be less costly from the perspective of fixing the errors that occur as a result of curing white concrete in the summer heat with all the problems that occur in the weeks that follow.
i.e...... a "value"-based engineering change decision.
Should they have known better ahead of time that this was a likelihood and anticipated it?
Probably.
This is where experience comes into play, but even then you can't possibly anticipate everything that a project will encounter in its lifecycle.
Not so obvious but still significant is the fact that the type of concrete they proposed to use would take longer to cure and set - adding significantly to the construction schedule time, which,......as is well known...,more time added to a project on top of what wa scheduled is more money being spent that wasn't budgeted.
But ultimately this is what it comes down to right here in black and white:-
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"3. The white concrete is exponentially expensive. The costs difference between changing to "gray" concrete with white elastomeric and traffic coating, vs pure white concrete is substantial and is a benefit to the developers. Obviously, the redesign presented new set challenges but thats for another discussion."
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I'm sure it looked great in the initial project proposal, but like I said, once real-world costs and considerations come into play, so do these cuts too.
Whether you refer to them as value-based engineering or not.
Again, perhaps someone should have mentioned that,
"white concrete is exponentially expensive" at the outset and saved them all this trouble, but thing is, people rarely ever think about costs that early on in a project proposal and the truth is for most projects if you did, they'd never proceed beyond that point.
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