Poisson's ratio variations in concrete

This paper presents the results of an investigation relating to the variations in the Poisson's ratio in compression of concrete. An embeddable strain-gage unit has been developed for use in this investigation, and the readings from this gage unit proved quite reliable. With embeddable gage units, and surface-bonded strain gages, concrete test specimens were prepared and tested under uniform load in compression. The test results from this investigation prove that the Poisson's ratio of concrete is minimum at the faces of the test specimens, and it increases as the point moves towards the specimens' axes, where it reaches a value about 56 percent larger than that at the faces of these specimens.