Statistical Methods to Evaluate in-Place Test Results


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Title: Statistical Methods to Evaluate in-Place Test Results

Author(s): Nicholas J. Carino

Publication: Special Publication

Volume: 141


Appears on pages(s): 39-64

Keywords: compressive strength; construction; loads (forces); pullout tests; regression analysis; safety; statistical analysis; strength; tests; General

Date: 12/1/1993

In-place testing is used to estimate the compressive strength of concrete in a structure by measuring another related property. A strength relationship is used to convert the in-place test results to an estimate of the compressive strength. Statistical methods are needed for reliable estimates of in-place strength. Such methods should account for the uncertainties in the measured property, the uncertainty of the strength relationship, and the variability of the in-place concrete. Standard statistical procedures for dealing with these uncertainties have not yet been adopted in North American practice. Recommendations are provided for developing the strength relationship, and a reliable, easy-to-use approach is presented to estimate in-place characteristic strength.