Abstract
The aim of this paper is to indicate solutions which fulfil the conditions for laying concrete mix before it starts setting. Using models M/M/N/-/N, for organization I for the so-called delivery directly after unloading, with automatic transfer of information using the RFID system, and M/M/1/FIFO/N/F, for organisation II with transportation units working in closed cycle. Of example, organisation I, with RFID system is more advisable as it is characterised by a shorter waiting time on construction sites; and longer at the concrete-mixing plant. At the same time, it increases the efficiency of working units compared with organisation II which has self-regulating transportation units running in closed cycle.