ISSN: 0149-6123
Page Count: 5

Strength Evaluation of In-Situ Concrete by Rebound Hammer and Core Testing
Ward, MA
Professor emeritus and associate professor, University of Calgary, Alberta

Langan, BW
Professor emeritus and associate professor, University of Calgary, Alberta

Abstract

This paper describes the results of an extensive field investigation where the quality of in-place concrete flatwork was evaluated. Nondestructive testing (NDT) was carried out using ultrasonic pulse velocity and rebound hammer techniques to establish a correlation with compressive strengths of core tests. The rebound hammer/core correlation formed the basis of a recommendation on the acceptance or rejection of the in-situ concrete. The ultrasonic pulse velocity UPV testing was primarily used to establish concrete uniformity. Limited freeze-thaw testing was carried out to determine the potential long-term durability performance. In order to minimize the effects of surface preparation on the test results, considerable time was spent to determine the optimum grinding procedure.

Keywords:
concrete, strength, nondestructive testing (NDT), flatwork, in place-testing, rebound hammer, ultrasonic pulse velocity, core testing

Paper ID: CCA10297J
DOI: 10.1520/CCA10297J
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