Comparison of normal and lognormal frequency distribution for representing variations of concrete compressive strength

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Abstract

The ACI 318-89 specifications and the ACI Committee 214 recommendations used to determine the strength of concrete are based on the assumption that variation of concrete strengths follow normal distribution. In this article the validity of this assumption is evaluated with the use of 100 different sets of data collected in the field. The objective of the study is to evaluate whether the number of low tests can be predicted accurately using normal or lognormal distribution rather than checking whether the distributions provide an overall good fit. The efficiency of the chi-square test in improving the accuracy of low test prediction is also studied. For purposes of comparison, the performance of lognormal distribution is also evaluated.

Original languageEnglish (US)
Pages (from-to)191-199
Number of pages9
JournalACI Materials Journal
Volume92
Issue number2
StatePublished - Mar 1 1995

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Building and Construction
  • Materials Science(all)

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