Posted by Billy NY on April 11, 2012 at 10:01:01 from (67.248.100.3):
In Reply to: Re: Pole Barn Posts posted by 641Dave on April 11, 2012 at 08:12:56:
10,000 psi = pounds per square inch-compressive strength, meaning it will take that much and more (safety margin) to reach failure under compression.
They take a test cylinder of the actual mix design, fill it according to ASTM criteria let it cure/hydrate, wait 28 days, then place in a testing machine that will impose compressive forces on it = to the PSI of the design mix, in this case 10,000 PSI, if it shows no failure than that particular mix design proves to be 10,000 PSI, if it fails at or before, it will not perform if those kinds of loads are placed onto it. That is some high strength material, not commonly seen in typical construction. I can't recall how high of a PSI concrete there is, remember reading about developments/increases in concrete strength, abrasion resistance, but don't recall the highest strength developed to date.
The word Nominal in there, throws me off, I would ask what is the actual tested compressive strength of the concrete used to fabricate these, given the shape and size I can kind of visualize why the strength may need to be higher, given the forces at work, and performance required.
Here's their AIA specification for Concrete:
Concrete Column: 10,000 (Nominal) psi pre-cast self consolidating concrete (SCC) with four (4) continuous vertical reinforcing bars of A706 weldable 60 ksi yield strength steel. Number 4 bars are used for the PC6300, PC6400, and PC6600 while number 5 bars are used for the PC8300 and PC8400 models. Superplasticizers and polymer fiber reinforcement are added as well as other admixtures to increase freeze/thaw resistance, rust resistance, flexural and compressive strength as well as optimizing the hydration process.
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