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Published online by Cambridge University Press: 11 February 2011
The Intermediate Physics laboratory is a pivotal course of the undergraduate physics curriculum. Besides its intrinsic importance for introducing modern physics experiments, this laboratory also plays an important role in addressing the needs of the future applied scientist and engineer using contemporary equipment for data acquisition and control. This laboratory course has a mix of standard (usually not directly addressing materials science questions) and newer experiments. Among the newer experiments, we have developed a kit for measuring the transverse and longitudinal Young and Shear modulus of a homemade concrete block by analyzing their standing modes of vibrations. The technique is similar to that of the C-215 American Society for Testing Materials (ASTM) Standard, but more appropriate for university educational setting, using ordinary student laboratory equipment and piezoelectric transducers. From these measurements, we also deduce Poisson's ratio. Students start measuring during the curing process of the concrete sample, something that it is not possible with the standard technique. However, our results have a precision comparable to that of the standard. Through the experiment, students learn about the properties of concrete. They make the samples following the C-192 ASTM standardized process, and review several concepts about waves such as wave equations, resonant modes of vibrations, dispersion relations, and standing modes.