Extending the Interpretation of Concrete Strength Data


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Title: Extending the Interpretation of Concrete Strength Data

Author(s): Robert G. Sexsmith

Publication: Journal Proceedings

Volume: 66

Issue: 2

Appears on pages(s): 115-117

Keywords: compressive strength; concretes; plain concrete; probability theory; quality control;reliability; sampling; statistics.

Date: 2/1/1969

The method used at present for interpreting concrete strength data (ACI 318-63, Section 504 ) is briefly examined, attention being restricted to the case where strength is a basis for acceptance, and where mix proportioning, quality control, job inspection, etc., are consistent with accepted good practice. The present method focuses on the proportion of understrength test outcomes. A generalization of this method, using the same underlying assumptions, yields a probability function on the proportion of understrength concrete in the work, which is the variable of real interest. This probability function provides a basis for rational decisions regarding acceptance of the work.