ISSN: 0149-6123
CODEN: CCAGPD
Page Count: 8

Results of an Interlaboratory Test Program: Compressive Strength of Concrete
Bickley, J
President, John A. Bickley Associates Ltd., Ontario

Thomas, M
Assistant professor, University of Toronto, Ontario

Detwiler, R
Senior engineer, Construction Technology Laboratories, IL

Kennedy, S
Project coordinator, PCL Constructors, Inc., Ontario

Abstract

Although both ASTM and CSA have had standards for testing the compressive strength of concrete cylinders since the 1920s, neither standard contains a statement of the within- and between-laboratory precision of its test method as prescribed by Practice for use of the Terms Precision and Bias in ASTM Test Methods (ASTM E 177). This paper describes an interlaboratory study performed by 16 CSA-certified Ontario testing laboratories in accordance with Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method (ASTM E 691). The analysis shows that the variability of the test results increases with the mean strength of the concrete. A precision statement based on the results reported here is recommended for inclusion in Test Method for Compressive Strength of Cylindrical Concrete Specimens (ASTM C 39) and CSA A23.2-9C (Compressive Strength of Cylindrical Concrete Specimens).

Keywords:
ASTM C 39, ASTM C 802, ASTM E 177, ASTM E 691, compressive strength, concrete, CSA A23.2, interlaboratory study, precision, reliability, test method, variability

Paper ID: CCA10330J
DOI: 10.1520/CCA10330J
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