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3" DIA x 6" CONCRETE TEST CYLINDERS

3" DIA x 6" CONCRETE TEST CYLINDERS

3" DIA x 6" CONCRETE TEST CYLINDERS

(OP)
I am seeing these smaller concrete test cylinders being used to mold concrete for compressive strength vs the traditional 6" dia x 12" high test cylinder molds

Is this permitted by ACI

RE: 3" DIA x 6" CONCRETE TEST CYLINDERS

4x8's are now permitted by aci and ibc. you should read the documentation though since it requires more specimens and possibly different equipment.

RE: 3" DIA x 6" CONCRETE TEST CYLINDERS

I would guess you are seeing 4"x8" cylinders rather than the 3"x6" in the thread title.  As msucog pointed out, ACI standard strength acceptance is based on 2 - 6"x12" cylinders or 3 - 4"x8" cylinders at 28-days.  No matter what, you are still limited to 3x the maximum aggregate size of the aggregate in the concrete per ASTM C 31, and the consolidation procedure is 2-lifts with a 3/8" diameter rod.  The 4"x8" cylinders can only be used for concrete containing aggregates up to 1 1/4" maximum size.

Greg

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