ABSTRACT
Rheological properties have been studied with regard to the physical determination of i n i t i a l and f i n a l concrete setting. These time points are very important for a perfect placing of the concrete in building structure. Rheological properties of the mixture vary steadily within the i n i t i a l and f i n a l setting time with consequent progressive decrease in workability, as well as increase of energy consumption at the subsequent compaction. The period from the i n i t i a l setting limits the time interval suitable for the placing of the concrete mix. The period from the f i n a l setting limits approximately the time i n - terval for the mixture compaction. It can be assumed that i n this time period the mixture i s capable to bear the revibration without decreasing i t s quality of further concrete layers.
