The average within-test range is used for estimating the within-test standard deviation. The sample is a is therefore more useful than the standard deviation in com- portion of the population, consisting of a finite amount of data. The min- imum required average strength is established so that non- maintaining appropriate significant figures. The frequency of concrete tests can 5. Skip to main content.

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R Guide to Evaluation of Strength Test Results of Concrete, –

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214.4R-10 Guide for Obtaining Cores and Interpreting Compressive Strength Results (Reapproved 2016)

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