Title: Statistical Study of the Correlation Between Field Penetration Strength and Field Cylinder Strength

Author(s): C. J. Turkstra, P. Zoltanetzky, Jr., H. P. Lim, and C. Gordon

Publication: Symposium Paper

Volume: 112

Issue:

Appears on pages(s): 165-180

Keywords: compressive strength; concretes; cylinders; nondestructive tests; penetration tests; probes; statistical analysis; variability; General

DOI: 10.14359/3736

Date: 1/1/1989

Abstract:
Presents a comparison of 28 day concrete strength as measured by field probe penetration tests and standard laboratory cylinders. Over a period of 11 months, 318 matched sets of tests were performed on 4000-psi concrete at four major projects. Primary field variables include the project location, operators, test guns, and the element type on which the field tests were made. Corrections to account for temperature variations are considered. Results include statistical analysis of the effects of test parameters and the correlation between field and laboratory results. Based on standard statistical tests, it is concluded that the variability of field probe results is similar to that of the corresponding laboratory cylinder tests. Results did not depend significantly on operators or the particular equipment used. However, results did depend significantly on the type of structural element tested and on the range setting of the firing gun. It is concluded that the calibration charts provided with the equipment should be reviewed.