The purpose of the graduation thesis was to determine the rheological properties and workability of fresh self-compacting concrete, in which stability was ensured through a combination of chemical stabilizer and limestone powder. Tested rheological parameters were plastic viscosity and yield shear stress, and workability parameter slump flow. Rheological parameters, plastic viscosity and yield shear stress have only recently started to be subject of research, after the new testing methods revealed that concrete is actually Bingham liquid. We designed numerous concrete mixtures, which differed in the amount of
limestone powder and contained a chemical stabilizer. Based on the results obtained, we tried to determine whether the stabilizer influences the behaviour of fresh concrete. We also designed the same number of concrete equivalent mortar mixtures and compared the results with the results of concrete mixtures. To obtain the values of plastic viscosity and yield shear stress rheometer Contec Viscometer 5 was used. To determine the workability of fresh concrete the slump flow method was used.