Statistical analysis of strength of concrete

Abstract Data on tests of compressive strength of 150 mm concrete cubes collected during the last 10 yr period for characteristic concretes of 150 kg/cm 2 , 250 kg/cm 2 and 350 kg/cm 2 is analysed. The statistical analysis indicates that the strength of the most of the groups of the concrete follow normal distribution with one percent significance level except for a small group of 150 kg/cm 2 concrete. The mean value and variance of the strength of the concrete in any group show a random variation. The most probable value of the failure of concrete cubes is found to be 5·5%. This value checks closely with that recommended by the CEB-FIP committee for international code of practice.