Statistics of Concrete Shrinkage Test Data

by Z. P. Bažant, Northwestern Univ, United States,
F. H. Wittmann, Northwestern Univ, United States,
F. Alou, Northwestern Univ, United States,
J. K. Kim, Northwestern Univ, United States,

Abstract: The paper reports a large series of concrete shrinkage tests which can be used for statistical purposes. The series involves two groups of 36 identical cylindrical specimens, with a diameter of 83 mm for group 1 and 160 mm for group 2. Statistical analysis of shrinkage strains and strain rates is presented and the goodness of fit by normal distribution, log-normal distribution, and gamma distribution is analyzed. Correlations between the values at various times are determined. The study reveals only the intrinsic randomness of the shrinkage process (along with measurement errors) and omits the superimposed uncertainties due to randomness of environment and to prediction uncertainties in the influence of material composition, curing and other factors.

Subject Headings: Shrinkage (material) | Strain rates | Data processing | Material tests | Field tests | Statistics | Materials processing

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