Concrete Sampling for Compressive Strength
Concrete Sampling for Compressive Strength
(OP)
According to ACI and ASTM new/ revised standards on concrete sampling/ or testing, concrete sampling can be tested by using 4” * 8” cylinders instead of 6” * 12” to find the compressive strength of the concrete. According to my understanding, instead of 6” * 12” with 2 cylinders for 28 days break, we have to sample 3 cylinders with 4“ * 8”.
If this is correct as per the new standard version, I appreciate if someone can let me know the standard number/ or spec.
Thank you
If this is correct as per the new standard version, I appreciate if someone can let me know the standard number/ or spec.
Thank you






RE: Concrete Sampling for Compressive Strength
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RE: Concrete Sampling for Compressive Strength
The ACI 318-05 doesn't mention size of cylinders directly but references:
ASTM C172-04 (Method of Sampling)
ASTM C31-03a (Making test specimens)
ASTM C39-03 (Testing for compressive strength)
With the current IBC 2006 referencing ACI 318-05, and this ACI 318 referencing these earlier standards (which don't allow 4" cylinders), then technically any new ASTM standard allowing 4" diameter cylinders are not approved by the city or other jurisdiction which approved the IBC 2006. Right?
RE: Concrete Sampling for Compressive Strength
i suspect that the supplement to come out this year will adopt the newest version of C31 but there's no telling when that might actually come out (i suspect near spring time but that's purely a guess).
RE: Concrete Sampling for Compressive Strength
According to the changes to expect in the 2008 edition of the ACI building code (ACI 318-08) in chapter 5, the Code has adopted to use of three 4” x 8” cylinders as equivalent to the use of two 6” x 12” cylinders for determining compressive strength.(CI Journal July,2007)
Did anybody knows that this new ACI 318-08 is available in the store?
RE: Concrete Sampling for Compressive Strength
RE: Concrete Sampling for Compressive Strength
http://w
RE: Concrete Sampling for Compressive Strength
RE: Concrete Sampling for Compressive Strength
Thank you so much for your information.