Analysis of Maturity/Pullout Testing Data


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Title: Analysis of Maturity/Pullout Testing Data

Author(s): R. L. Dilly, V. Beizai, and W. L. Vogt

Publication: Special Publication

Volume: 101


Appears on pages(s): 27-46

Keywords: age-strength relation; coefficient of variation; concretes; computer programs; evaluation; nondestructive tests; pullout tests; regression analysis; standard deviation; statistical analysis.

Date: 9/1/1987

Pullout testing provides a measurement of in-place strength of concrete, and maturity can be used to estimate strength development. Test statistics are useful tools for interpreting the significance of the data. Maturity may correlate to pullout strength by regression analysis. The simplest correlation would be linear using the logarithm of maturity. Linear relationships may be compared using test statistics to determine if slopes and/or intercepts are significantly different. Statistical analysis techniques are used to evaluate pullout strength and maturity data. Some limitations associated with these techniques are discussed. A programmable calculator was used to develop the programs to illustrate the application of these analysis techniques.