Variation of the Dynamic Young's Modulus of Elasticity with Size and Shape of Concrete Samples When Using Standard Resonant Longitudinal and Flexural Frequency Tests
The dynamic modulus of elasticity (E) is one of concrete's most important characteristics. It is used in axial stress and bending moment resistance calculations, as well as to monitor damage development. E, as a material property, should remain constant for a material regardless of the size and shape of the sample. Nevertheless, when using the Standard Test method developed by the American Society for Testing and Materials, errors in the measurement of E occur. In this study, different shapes, sizes, and vibration modes are used to identify variations in E. The modulus of elasticity is measured in six concrete cylinders and six concrete beams. These measurements are compared with an accurate value for E, measured using the Vibrational Resonant Frequencies Test method, selected for its high accuracy in determining E for concrete cylinders. After collecting data, the longitudinal mode proved to be the most accurate vibration mode, while the small cylinders and the big beams provided the most accurate results in terms of size and shape.
School:
University of Puerto Rico at Mayagüez
Department:
Civil Engineering
Research Advisor:
John S. Popovics
Department of Research Advisor:
Civil and Environmental Engineering
Year of Publication:
2006