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RE: Concrete Compression Tests

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According to PCA's "Design and Control of Concrete Mixtures" (1988), 4x8
cylinders "tend to break slightly higher than 6-inch diameter cylinders" but
"the difference is usually insignificant". The 4-inch cylinders may be used
with aggregate up to 1-inch maximum size. 

> -----Original Message-----
> From: Lutz, James [mailto:JLUTZ(--nospam--at)earthtech.com]
> Sent: Wednesday, January 10, 2001 2:30 PM
> To: seaint(--nospam--at)seaint.org
> Subject: Concrete Compression Tests
> 
> 
> The ASTM default standard for compression test cylinder molds (for
> acceptance testing) has been 6 inch diameter x 12 inches for 
> as long as I
> can remember, but the test labs tell me that about half the 
> tests they run
> these days are on 4 inch diameter x 8 inch specimens. Has 
> anybody out there
> had problems with the reliability of the tests done with the smaller
> specimen size. The tests are a little cheaper with the 
> smaller size, and I'm
> getting asked if it's ok to use them.I don't know whether I 
> should go with
> the flow or insist on the old standby.
> 
> Jim Lutz
> Earth Tech, Inc.
> 
> 10800 NE 8th Street - 7th Floor
> Bellevue, WA 98004
> (425) 455-9494
> (425) 453-9470 FAX
> 
> 
> 
>