Concrete Q & A: Number of 4 x 8 in. Cylinders Required for a Test Result

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Title: Concrete Q & A: Number of 4 x 8 in. Cylinders Required for a Test Result

Author(s):

Publication: Concrete International

Volume: 31

Issue: 11

Appears on pages(s): 76

Keywords:

Date: 11/1/2009

Abstract:
We’re building a multistory reinforced concrete frame building and using 4 x 8 in. (100 x 200 mm) cylinders for acceptance testing at 28 days. The engineer of record says we need to average three cylinders for a test result instead of the two cylinders per test we were planning on. What is the standard number of cylinders that comprises a valid test? And if it is three, when did the requirement change from two to three cylinders?