Statistical Properties of Techniques for Predicting Concrete Strength and Examples of Their Use

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Title: Statistical Properties of Techniques for Predicting Concrete Strength and Examples of Their Use

Author(s): John K. Moore and Michael A. Taylor

Publication: Special Publication

Volume: 56

Issue:

Appears on pages(s): 259-284

Keywords: accelerated tests; calibrating; compressive strength; com-puter programs; quality control; regression analysis; statistical analysis.

Date: 10/1/1978

Abstract:
This paper contrasts the statistical properties of two statistical techniques for predicting the ultimate strength of concrete, using data from two preliminary calibration experiments. The techniques are: (1) prediction from the mean early strength by the usual regression line; (2) prediction from a conservative estimate of early strength by a conservative relationship of early strength to ultimate strength. It is shown that the latter method guarantees (for almost all calibration experiments) a, high percentage of conservative predictions of ultimate strength -- as concrete users desire -- and that the former method, which is commonly used, does not. The use of the techniques is illustrated by predictions of 28-day cylinder strength from the strength of cylinders autogenously cured for 48 hours.