Use of Simultaneous Nondestructive Tests to Predict the Compressive Strength of Concrete


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Title: Use of Simultaneous Nondestructive Tests to Predict the Compressive Strength of Concrete

Author(s): G. V. Teodoru

Publication: Special Publication

Volume: 112


Appears on pages(s): 137-152

Keywords: attenuation; compressive strength; computer programs; impact hammer tests; nondestructive tests; precast concrete; quality control; ultrasonic tests; General

Date: 1/1/1989

Aim is to analyze the correlations between several nondestructive measured values (ultrasonic velocity and attenuation, rebound number) and the compressive strength of concrete. A computational program performs a step-by-step analysis. First, isolated linear correlations are established for each one of the three nondestructive tests. Then the results are compared with each other in the sense of a general multiple correlation of the values. Since the results obtained from the nondestructive tests are equally scattered, the program determines interactively, in a second step, the multiple coefficients of correlation and restarts the analysis several times by tentatively disregarding the presumably bad experimental results. Since the measured values also comprise a large spectrum of magnitude, limits of validity of the assumed correlations are investigated concomitantly with the process of analysis. A last step is performed to identify a tendency of deviation of the single and multiple correlations from the basic linear ones.