Pumping of concrete: Understanding a common placement method with lots of challenges

Several million cubic meters of concrete are pumped daily, as this technique permits fast placement. Fundamental research has been performed and practical guidelines have developed to increase the knowledge behavior in pipes. However, pumping process not fully understood. This paper gives an overview current pumping. At first, known physics governing flow pipes introduced. A series experimental techniques characterizing near a smooth wall predict pressure-flow rate relationships discussed, followed by recent developments use numerical simulations The influence on rheology air-void system is reviewed, first active control for last section open questions challenges.