The objective of this work is to improve the interpretation given to the response of a sensor measuring the drag force exerted on a probe immersed in a concrete during the mixing. The field of operation of such a sensor and its ability to transcribe any change in rheological properties of concrete are studied. Two types of sensors location are tested on a planetary mixer, with a planetary movement and with a simple rotational movement. In addition, the rheological behaviour of concrete is identified using a concrete rheometer. Numerical simulations of the flow of a Bingham fluid in a mixer are also done in addition to experimental analysis. The 2D simulations use the interpretation of experimental measurements and allow studying various configurations of mixing. The results indicate that the structure of the concrete flow in a planetary mixer is divided into two main flows: a plug flow in the vortex and an interaction flow between the scraper and the vortex. The use of Stokes's law adapted to the flow of Bingham fluids allows a satisfactory interpretation of the variations in measured drag forces. The flow curves resulting from this method are compared with those using the rheometer for various concrete formulations. The inline rheometry is accessible in the presence of self compacting concrete.
