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The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
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:
DOI:
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?
Electronic Concrete International