SPP 2005:  Opus Fluidum Futurum - Rheology of reactive, multiscale, multiphase construction materials

• Subject Area: Construction Engineering and Architecture
• Term: since 2017
• Website: Homepage
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 313773090

The processing of cement-based building materials is the technological core in construction and maintenance of structures. However, there is still lack of a scientific framework for mastering rheology-based processes. This leads to faults in structures and low efficiency of construction, but it is also a major obstacle for developing novel construction technologies, such as 3D printing with concrete. The main reason behind the shortcomings of the rheological framework is the extremely high complexity of the cementitious systems. The high chemical reactivity of mineral binders induces rapid changes in the particle morphology, the dissolution of larger and formation of new nanoscale particles, and severe alteration of the carrier liquid. Furthermore, cementitious suspensions are always complex multi-phase systems which contain organic admixtures and air pores in addition to water and various mineral particles including granular raw materials up to several centimetres in size (multiscale). Finally, casting and processing of cementitious materials are carried out under an enormous range of deformation rates, which result in extremely high demands of characterisation and simulation methods. The goal of the SPP 2005 is to ascertain and describe the scientific fundamentals for understanding and consecutively designing rheology-based construction processes as well as for developing innovative, sustainable building materials and associated pioneering processing technologies.

• DFG Programme: Priority Programmes
• International Connection: China, Iraq, Luxembourg

Projects

• Analysis of Time-variant Nano- and Microscopic Mechanisms for Modelling the Meso- and Macroscopic Segregation Stability of Concrete Subject to Vibration (Applicant Bigall, Nadja-Carola )
• Component additive approach to predict cement paste rheology considering mineral and particle heterogeneity on different scales (CONCERT) (Applicants Haist, Michael ;  Ludwig, Horst-Michael ;  Schäfer, Ph.D., Thorsten )
• Component additive approach to predict Cement paste Rheology considering Secondary Cementitious Materials and their special effect on thixotropy and concrete de-airing behaviour (Applicants Haist, Michael ;  Ludwig, Horst-Michael ;  Schäfer, Ph.D., Thorsten )
• Coordination Funds (Applicant Mechtcherine, Viktor )
• Direct numerical simulation of dynamic aggregate migration in fresh concrete using multi-scale Smoothed-Particle Hydrodynamics (Applicant Steeb, Holger )
• Effects of steel and polymer fiber on the rheological behavior and processing parameters of cement-based materials in the context of 3D-printing by layered extrusion – printFRC (Applicant Mechtcherine, Viktor )
• Flow-induced particle migration in cement-based materials at high shear rates (Applicant Mechtcherine, Viktor )
• Form filling ability of fresh concrete: A time and hydration dependent approach (Applicants Gehlen, Christoph ;  Koenders, Ph.D., Eduardus )
• From micro to macro – fundamental concrete modelling considering local shear rate and microstructure inhomogeneities due to processing using a scale-bridging approach (Applicants Mai, Inka ;  Schilde, Carsten )
• Influence of superplasticizers on the structure-property relationship of fresh cement pastes analyzed by novel rheological combined techniques (Applicant Wilhelm, Manfred )
• Internal dynamics in concrete and model systems of concrete: 3D particle tracking, flow and concentration profiles. (Applicant Auernhammer, Günter K. )
• Investigating the Rheological Behavior of Low Water-to-Cement Concretes Admixed With Superplasticizers and Co-Dispersants and the Underlying Dispersion Mechanism (Applicant Plank, Johann )
• Multiphase granular suspension flow during pumping in complex geometries - FLOWcomplex (Applicants Mechtcherine, Viktor ;  Schwarze, Rüdiger )
• Open channel flow behaviour of concrete in the presence of obstacles and mechanisms of flow blockage (OCF-Blockage) (Applicant Haist, Michael )
• Rheology of low clinker concretes with tailored superplasticizer polymers - Control and modelling of viscosity and thixotropic structural build-up (Applicants Jansen, Daniel ;  Lowke, Dirk )
• Shear-Dependent Rheological Behavior of Ecologically Improved Cements Containing Calcined Clays as Clinker Substitute (Applicant Plank, Johann )
• Simulation based modelling of time- and shear-dependent disperse and rheological properties of cement suspensions (Applicants Budelmann, Harald ;  Krauss, Hans-Werner ;  Kwade, Arno ;  Schilde, Carsten )
• Stability of concrete subjected to vibration – Analysis of the nano- and microscopic structural build-up and structural breakdown behavior of cementitious suspensions (Applicant Lohaus, Ludger )
• Superposing particle interactions and hydration effects on the rheology of cementitious systems in the presence of different ions in the aqueous phase – (SPHERE DOS) (Applicants von Klitzing, Regine ;  Schmidt, Wolfram ;  Stephan, Dietmar )
• Tailored yield stress for 3D printing using Low clinker cement - Low-Clinker-Cement-3D-Printing (LCC3D) (Applicants Neubauer, Jürgen ;  Stephan, Dietmar )
• The characterization of the rheological properties of suspension, mortar and concrete under the influence of hydration, temperature, pressure and vibration (Applicant Garrecht, Harald )
• Understanding fresh concrete flow by advanced rheological characterization (Applicant Schmid, Hans-Joachim )
• “Viscoelasticity related deformability and structural build-up of fresh concrete” Effects of carrier liquid chemistry on particle interactions (Applicants Kränkel, Thomas ;  Schmidt, Wolfram ;  Ukrainczyk, Ph.D., Neven )

• Spokesperson: Professor Dr.-Ing. Viktor Mechtcherine