Non-destructive determination of concrete elastic constants from vibration frequencies of cylinders

Popovics, J. S.; Wang, J.
May 2000
AIP Conference Proceedings;2000, Vol. 509 Issue 1, p1685
Academic Journal
A new method allows accurate and nondestructive determination of the elastic constants (E and v) of standard concrete test cylinders. These standard specimens are solid circular cylinders with a length to diameter ratio (aspect ratio) of approximately 2:1. This new method, based on mechanical vibration resonance measurements in intermediate-length cylinders, is more accurate and easier to apply than existing standardized test methods for concrete. However, the effects of several experimental test parameters on the accuracy of the results have yet to be determined. In this paper, the basis and methodology of the new test method is reviewed. The validity of the new method is first demonstrated: experimental data from concrete cylinders are compared to those obtained by existing standardized tests. Next, the effect of the support/boundary conditions of the concrete specimen on the obtained results of the new method is investigated, wherein it is demonstrated that the nature of the boundary or support conditions have negligible effects on the results. Finally, the effect of specimen size is investigated. Three different specimen sizes (76mm, 102mm and 152mm diameter) are considered; all specimens have an aspect ratio of approximately 2:1 and are comprised of the same concrete. Results from the specimens demonstrate that the size of the specimen has little effect on the obtained results. In summary, the presented results demonstrate the robustness and accuracy of this new nondestructive test technique. © 2000 American Institute of Physics.


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