Title:
Determination of Concrete Strengths with Break-Off Tester
Author(s):
Michael G. Barker and Julio A. Ramirez
Publication:
Materials Journal
Volume:
85
Issue:
4
Appears on pages(s):
221-228
Keywords:
aggregate size; compressive strength; concretes; variations; nondestructive tests; water-cement ratio; Materials Research
DOI:
10.14359/2050
Date:
7/1/1988
Abstract:
The correlations of the break-off test results with those of the ASTM compression cylinder and the ASTM modulus of rupture beam tests were examined. The variables investigated were the water-cement ratio, the aggregate type, and the maximum aggregate size. In this study, the uncertainties associated with the 75 compression cylinders, 59 modulus of rupture beams, and 99 break-off tests were evaluated. Results indicate the break-off test is less influenced by aggregate effects than the modulus of rupture beam. The inherent variability of the beam test is not evident in the break-off test. The break-off test better correlates with the compression cylinder. The results show that estimating in situ compressive strengths using the break-off tester seems promising for aggregate sizes up to at least one-half in. (13 mm) maximum. Furthermore, previous studies suggest that the relationship is adequate for larger size aggregates.