Abstract
Concrete has been traditionally modeled as a linear elastic material when subjected to low stresses, and non-linear for higher compressive stress, showing a softening trend. Conversely to the traditional model, recent research has shown that even under small compressive stress levels, concrete behaves nonlinearly following a hardening behavior. This behavior can be modeled in 1D by adding a “non-linear” parameter ?G. This ongoing investigation has the objective of characterizing the ?G parameter for concrete specimens subjected to low compressive stresses using vibration phenomena. Three prisms of different concrete mixture designs are studied. The prisms are subjected to four loading and unloading cycles in steps of approximately 1 MPa, up to 6 MPa. The fundamental torsional frequency is measured at each loading/unloading step. The parameter ?G is computed for every loading/unloading cycle of each prism. The experimental results agree with the theoretical model. For all specimens, parameter ?G was found to be lower for the first loading cycle, between 90 and 110, and between 120 to 170 for the remaining loading/unloading cycles.
How to Cite:
Spalvier, A. ., Domenech, L. ., Cetrangolo, G. . & Popovics, J. S., (2019) “Acoustoelastic characterization of concrete prisms via torsional vibration phenomena”, Review of Progress in Quantitative Nondestructive Evaluation .
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