Bingham parameter plastic viscosity is experimentally linked to particle shape. An explanation for the behaviour of particles is sought after experimentally, analytically and numerically. The yield stress level may be decreased by adding superplasticizers, however, the plastic viscosity may not. An increased share of non-spherical particles in concrete increases the level of yield stress, τ0, and plastic viscosity, µ pl.
It is known that aggregate properties such as size, shape and surface roughness as well as its grading curve affect fresh concrete properties. Good correspondence was achieved with a Bingham material model used to simulate concrete laboratory tests (e.g. In this thesis, numerical simulation of concrete flow and particle behaviour is investigated, using both discrete as well as a continuous approach. Predicting flow behavior in the formwork and linking the required rheological parameters to flow tests performed on the site will ensure an optimization of the casting process. The fresh concrete rheology must be compatible with the reinforced formwork geometry to ensure complete and reliable form filling with smooth concrete surfaces. Simulation of fresh concrete flow has spurged with the advent of Self-Compacting Concrete, SCC. 2015 (English) Doctoral thesis, comprehensive summary (Other academic) Abstract
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