Pumpability of mortar and concrete as related to rheology

The pumpability of concrete was studied in a full scale pumping set-up instrumented to monitor flow trough the rotating pump and rubber hose, pressure over the hose and energy consumption in the pump. The flow out of the pump was fairly constant during 30 second measurements with fairly linear pressure drop over the length of the hose. Over 49 minutes the pump flow was reduced with 13 % whereas concrete pressure in the hose increased 2,5 times. The electric motor current increased 1,3 times to be able to keep the concrete flow through the system quite constant. The work was financed by maxit Group, NTNU and the Research council of Norway through Skattefunn and the COncrete INnovation centre (COIN).