Differences in instantaneous deformability of HS/HPC according to the kind of coarse aggregate

In the analysis of concrete structures the knowledge of real values of modulus of elasticity is of great importance, particularly at displacements or losses of prestressing consideration. For two-dimensional problems the Poisson's ratio is important too. Recommendations from the Standards can inform us roughly about these values but usually in the range of classes of ordinary concrete only. In general, greater the strength of concrete greater the differences in modules of elasticity for similar classes of concrete are. In the first row material factors have to be taken into consideration. To explain the range of variations the results of tests for high-strength/high-performance concrete manufactured with different components, particularly various kinds of coarse aggregates are presented. These results are compared with some other tests and with basic recommendations.