The effect of mix proportions and method of testing on Poisson's ratio for mortars and concretes

Abstract

Summary Following recent studies of concrete as a composite material, this paper examines whether there is a relation between the mix proportions and properties of the constituents and the over-all Poisson's ratio for mortars and concretes. From an examination of available and new data, it is apparent that Poisson's ratio is affected by the method of testing, the mix proportions, and the moisture condition and temperature of the specimens. Approximate expressions are proposed for the static and dynamic Poisson's ratios of saturated mortars and concretes made with gravel aggregates in terms of the volume fractions and Poisson's ratios of the constituent aggregate and cement paste phases. Static and dynamic tests do not measure the same properties of concrete, and suggestions are made for the differences between them.