Comparative Evaluation of Nondestructive Test Methods for in-Place Strength Determination


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Title: Comparative Evaluation of Nondestructive Test Methods for in-Place Strength Determination

Author(s): C. H. Yun, K. R. Choi, S. Y. Kim, and Y. C. Song

Publication: Special Publication

Volume: 112


Appears on pages(s): 111-136

Keywords: aggregates; compressive strength; concretes; curing; evaluation; impact hammer tests; nondestructive tests; probes; pullout tests; ultrasonic tests; variability; General

Date: 1/1/1989

Presents an investigation to determine the within-test variability of various nondestructive test methods (NDT) and the correlation between NDT test results and the corresponding compressive strength of cores. The size effects of coarse aggregate on the variability and correlation were also evaluated. The NDT test methods evaluated in the test series include rebound hammer, pulse velocity, probe penetration, pullout, and CAPO (cut and pullout). Companion tests of field-cured standard cylinders and cores were also made at the ages when the NDT tests were made. Results show that the within-test variability of the in situ tests reported (except the pulse velocity test) is two to five times higher than that of the corresponding standard compression test and is affected significantly by the amount of coarse aggregate and its size. There is a good relationship between the results of in situ tests and the compressive strength. In general, the highest degree of correlation is for the pullout test followed by that for the CAPO (cut and pullout) test and rebound test, probe penetration test, and pulse velocity test.