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Simulation based modelling of time- and shear-dependent disperse and rheological properties of cement suspensions

Sponsor: DFG

Contact person: Dimitri Ivanov

Summary of the overall project:

The project “Simulation based modelling of time- and shear-dependent disperse and rheological properties of cement suspensions” is part of the priority program “DFG SPP 2005 – Opus Fluidum Futurum – Rheology of reactive, multiscale, multiphase construction materials” (https://spp2005.de) and aims at modelling the rheology of cement suspensions. The Institute for Building Materials, Concrete Construction and Fire Safety and the Institute for Particle Technology work together to achieve this goal. A deeper understanding of the physical and chemical processes on a microscopic level is necessary to achieve this goal. This understanding is to be gained by means of experiments and coupled CFD-DEM simulations. In the experiments, a laser probe is installed in a rheometer in order to gain an impression of the agglomeration via the current particle size distribution and to be able to compare this with the viscosity. The results are compared with the simulations. After calibration and validation of the simulations, they can be used to vary different parameters and thus extend existing models. An important parameter is the shear history, as this has an influence on particle size distribution, flowability and workability. In order to calibrate the interparticle forces for the simulations, spherical model particles are produced from cement. The forces are then determined using atomic force microscopy.

Goals and tasks of iPAT

  • Definition and production of model particulate systems with clearly defined chemical and physical characteristics for experiments and simulations
  • Implementation of new contact models for the representation of interparticular forces in CFD-DEM simulations
  • Performing of systematic unresolved coupled CFD-DEM simulations of microparticulate suspensions, especially cement suspensions
  • Development of an enhanced constitutive rheological model with consideration for the time- and shear-dependent properties
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    Project partners

  • Institut für Baustoffe, Massivbau und Brandschutz (TU Braunschweig)

  • Team Members

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