Core Sampling Size in Nondestructive Testing of Concrete Structures

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Title: Core Sampling Size in Nondestructive Testing of Concrete Structures

Author(s): A. Di Leo, G. Pascale, and E. Viola

Publication: Special Publication

Volume: 82

Issue:

Appears on pages(s): 459-478

Keywords: calibrating; compressive strength; concrete cores; evaluation; nondestructive tests; sampling; statistical analysis.

Date: 9/1/1984

Abstract:
In this paper a procedure aimed to assess the characteristic value of actual compressive strength of in-situ concrete is presented. It involves: an evaluation of the homogeneity, which may suggest a subdivision of the structure in parts characterized by different estimated strength levels; a calibration of estimated strength values on the basis of a sample of cores. The experimental values obtained from cores can be utilized to modify the characteristic value of estimated strength: a) by means of an appropriate correcting coefficient; b) statistically through the Bayesian approach, according to which the mean value of the actual strength is considered as a random variable. Consequently, its characteristic value also becomes a random variable. Within the context of the subjectivistic approach to the decision theory, the optimization of the core sampling size is also discussed. Two examples of application of the procedure are reported.