Abstract
The results of a statistical analysis on steam-cured, plant-produced high-strength concrete in compression based on about 2,200 cylinders obtained from several concrete producers in the United States is summarized. The statistical analysis considers the actual-to-specified concrete strength ratio, coefficient of variation, and probability distribution function. The seasonal effect on the statistical properties of the strength is also included. The results of the analysis showed that both the mean-to-nominal and the coefficient of variation are higher for normal strength concrete than for high-strength concrete. The mean-to-nominal ratio varies between 1.078 and 1.255, whereas the coefficient of variation is in the range of 0.06528-0.1353, depending on the specified 28-day concrete strength. Also, the analysis showed that the mean-to-nominal ratio and the coefficient of variation for concrete produced in the cold season are both lower than the corresponding statistics for concrete produced in the warm season. The study will help code developers in generating probabilistic resistance models for concrete structures that can be used in the development of load resistance factor design codes.
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