Posted by Billy NY on February 29, 2012 at 06:39:10 from (67.248.100.3):
In Reply to: OT--Concrete Mix posted by Jiles on February 28, 2012 at 21:21:17:
I don't really buy that the plant messed up the mix design, its on the bag, the compressive strength, how much water to use, etc. Its possible, but does not seem likely, that the batching plant mixed and bagged faulty material.
Storage, bags are compromised with moisture, that is more likely. End user screwing up the water cement ratio (too much water)seems more likely, not saying that is the case here though.
Sounds like it never hydrated properly and reached its compressive strength.
My experience with bags, at least from jobs I've managed, is a good one. There is a place south of here in Stormville that pre mixes for contractors, and I think name brands like Quikcrete.
Many large masonry contractors like ones I've awarded contracts to, (multi million dollar contracts to give some scale), would buy tractor trailer loads of pre-mixed material from this supplier and every day to adhere to NYC D.O.B. rules a controlled inspection took place, they filled mortar cubes for compressive strength testing, none ever failed, was 3000 psi. I've used the same material, was always good.
Seems odd, well at least if you have to take any of it up, its soft !
The last time I had any experience with a material that did that, it was a 1000 psi lightweight concrete fill specified on the plans and specs for the job by the A/E, ordered 20 something yards, for various areas on the building, elevator machine room roof deck infill slab in same machine room, and similar, hoisted up in a concrete bucket with crane, took longer to place, none of it set up right, was warm out too, total crap, I'd never use that weak of a mix again and would have the A/E, approve different, was a big waste of time, had an after hours crew, cash, everything set up to go smooth, 'cept that material was not right, even the next morning, you could tell the difference between regular concrete and this material.
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