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RE: Concrete Compression Tests

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Using a smaller specimen would results in a higher strength recorded, and
thus need to be caution when interpreting the result. 

-----Original Message-----
From: Michael Bryson [mailto:bryson(--nospam--at)]
Sent: Thursday, January 11, 2001 9:11 AM
To: seaint(--nospam--at)
Subject: Re: Concrete Compression Tests

I know they've used 4x8s in Vancouver regularly for the last three or
four years.

On Wed, 10 Jan 2001, Lutz, James wrote:

> 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
> 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
> 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