Casting of T-beam using the PFI material model – influence of thixotropy and structural breakdown

Author(s): Jon Elvar Wallevik
Paper category: Proceedings of the International RILEM Conference Materials, Systems and Structures in Civil Engineering 2016 Segment on Fresh Concrete
Editor(s): Lars N. Thrane, Claus Pade, Oldrich Svec and Nicolas Roussel
ISBN: 978-2-35158-184-1
e-ISBN: 978-2-35158-185-8
Publisher: RILEM Publications SARL
Publication year: 2016
Pages: 218-226
Total Pages: 9
Language : English

Abstract: The Particle Flow Interaction theory is an example of a complex rheological model for cement paste. It combines concepts proposed by Hattori, Izumi, Tattersall and Banfill. More precisely, time dependence is assumed to be governed by a combination of thixotropic behavior (i.e. flocculation and de-flocculation) and structural breakdown (i.e. hydration effects). In [1], the PFI theory was presented as an analysis tool, in which flow was calculated inside a coaxial cylinders viscometer using the software VVPF (Viscometric-ViscoPlastic-Flow). The objective was to verify the model as well as to extract its material parameters for several HRWRA cases. In the current work, the PFI theory is programmed into the OpenFOAM framework, in which the flow of a PFI-fluid is calculated inside a T-beam. The objective now is to calculate the flow to observe the consequence of thixotropy and structural breakdown during casting. Although the PFI is for cement paste, it can serve as a tool to identify potential flow problems of a binder rich thixotropic concrete, like the SCC

Online publication : 2016
Publication type : full_text
Public price (Euros) : 0.00