Deformations of concrete occur due to the action of external load of environmental infulences, they are divided into two basic groups: volume deformations of concrete and deformations under load. Volume deformations can occur due to changes of hygrotermal conditions and they are devided into deformations due to temperature changes and deformations caused by shrinkage and swelling of concrete. Swelling is manifested by an increase in dimentions of the concrete elements, but it does not cause significant deformations. The types of shrinkage of concrete are: chemical and autogenous shrinkage, plastic shrinkage, drying shrikage, thermal shrinkage and carbonation shrinkage. The parameters that affect the size of shrinkage are the composition of concrete, the environment and the humidity and the geometric shape of concrete elements. Deformations under loads are divided into deformations under short duration loads and long duration loads. By testing concrete samples under the influence of short duration load, we obtain the modulus os elasticity, Poisson`s ratio and shear modulus. Creep occures under the influence od long duration load, it is measured with a device called creep testing machine.