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RE: Concrete - Cube Strength vs. Cylinder Strength

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This is a summary of what I found.
In general if you test concrete cubes, as is the practice in Europe, and use the cube test results to determine ACI 318 requirements for f'c, accounting for the effect of specimen geometry is required. The lower height to width ratio of standard 6 x 6 in. cubes results in a higher test strength than would be indicated using 6 x 12 in. cylinders.
Cylinder test strengths run between 5% and 25% less than a cube test specimen.  The following web site shows a good representation of the trend.

Regards, Harold Sprague


From: jgetaz(--nospam--at)
To: seaint(--nospam--at)
Date: Fri, 15 Jan 2010 06:20:36 -0500
Subject: Re: Concrete - Cube Strength vs. Cylinder Strength

        “But I have collected enough information to develop acceptance criteria for my Afghan work.”
                Anything you could share with the rest of us?
        Thank you,
        Jim Getaz

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