In the article the analysis of the dimensions of the samples used in the test concrete. Identified an opportunity to reduce of the dimensions of the samples. The tests at the same time the standard and small (25х25х100 mm) of the concrete samples. Small samples were obtained by cutting the standard samples. In the process of conducting research measured the density, strength and deformation of the samples standard and small sizes. The results are shown in tables and graphs. The strength of the small samples was below the strength of the standard samples. Revealed a loss of strength of samples when cutting concrete. Average deformation characteristics of concrete remained. Small samples are recommended for use in the evaluation of the stress-strain state of reinforced concrete structures.