Acta Scientiarum Polonorum

Abstract: Strength of concrete play fundamental role in design engineering, construction, and development of reinforced concrete buildings. High quality of test results in investigations to estimate research material accurate is very important. The paper contains an analysis of calculation procedure for uncertainty of results and medium strength for cubical samples concrete. Expression of uncertainty in measurements gives possibility to compare test results obtained from different laboratory. The paper is addressed to engineers who carry on concrete compression tests and interpreted the results.