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46. Slump flow values vs. Bingham parameters for high flowable mortars and concretes



Title: 46. Slump flow values vs. Bingham parameters for high flowable mortars and concretes
Author(s): O. Esping
Paper category : conference
Book title: 5th International RILEM Symposium on Self-Compacting Concrete
Editor(s): G. De Schutter and V. Boel
Print-ISBN: 978-2-35158-047-9
e-ISBN: 978-2-35158-088-2
Publisher: RILEM Publications SARL
Publication year: 2007
Pages: 315 - 322
Total Pages: 8
Nb references: 38
Language: English


Abstract: In the present work, the influence of Bingham rheology parameters on the slump flow values of self-compacting concrete and mortar has been evaluated. The objective was to present experimental results, without any physical validation, addressing the complex connection between the slump flow spread, flow time (T50), yield stress and plastic viscosity.
A large number of more or less self-compacting mortars (~200 mixtures) and concretes (~550 mixtures) with a wide range of consistency have been used for the evaluation.
The mortar rheology was measured using a Bohlin CVO200 rheometer with concentric setup, and the slump flow spread was measured using a mini-cone. For the concrete a ConTec Visco5 rheometer was used together with a traditional Abram´s cone.
The results showed a large scatter and poor correlation, but a clear tendency was found.
The results indicate that the slump flow spread and T50 time are not a unique function of yield stress or viscosity, respectively, but rather a more complex function of both. The spread proved to be more closely connected with the yield stress than with the viscosity, especially at high viscosity, whereas the T50 time was more dependent on both viscosity and yield stress.


Online publication: 2009-06-16
Publication type : full_text
Public price (Euros): 0.00