Recent research work of the authors is dealing with preparing, investigation and application of high performance concretes (HPC) produced by the mean of results of modern concrete technology. These special types of concrete have one or more outstanding properties conversely the normal concrete. This article is focusing on the results of the experiments regarding self compacting concrete (SCC). During the investigation, effects of the fine-graded fraction was studied, which is indispensable component of the SCC. The effects of bulk density, consistency, air content, compressive strenght were analysed on fresh and hardened concrete.