Acta Scientiarum Polonorum

Abstract: In constructional practice there is a must to verify: strength of designed concrete, quality control of industrial produced concrete and quality control of prefabricated elements during production. The next topic is estimation of strength concrete used in structure diagnostics. Evaluation of measurement result coming from contemporary metrology is another than in traditional statistical analysis. The theory of uncertainty applied now is based on probabilistic estimation sources of uncertainty related to investigation of measurand. This paper contains an analysis of calculation procedure for uncertainty of results and medium strength for cubical samples concrete. The results of laboratory strength f_cm and their uncertainty are presented. Expression of uncertainty in measurements gives possibility to compare test results obtained from different laboratory on the higher level.