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Rheologie du Beton Frais Remanie. I: Plan Experimental et Depouillement des Resultats
Published
Author(s)
F Larrard, Chiara C. Ferraris
Abstract
Part III of a French language version of **Testing and Modeling of Fresh Concrete Rheology,** NIST Interagency Report NISTIR 6094, February 1998.This report presents the results of an experimental program dealing with the rheology of fresh concrete. The three main goals were: 1) Obtain rheological data on concretes produced with various mixture compositions; 2) Establish models to link mixture composition with rheological properties; 3) Develop a new simple field test that will determine rheological parameters. Approximately 80 mixtures (mortars and concretes, with and without superplasticizer) were formulated and tested using a BTHREOM rheometer, with parallel tests on the slump cone. It appears that the relationship stress and strain rate for concrete is non-linear. A description of the behavior of the material that is better than the usual linear Bingham approach is provided by the Herschel-Bulkley model. Using the data obtained, the rheological characteristics of the mixtures as a function of their composition were modeled. A physical interpretation of the results is proposed. Finally, the development of a simple job-site test for estimating yield stress and viscosity is described. The results of this test for all mixtures used in the program were analyzed. Semi-empirical models are proposed for the yield stress and for the plastic viscosity.
Citation
Bulletin des Laboratoires des Ponts et Chaussees
Volume
213
Issue
No. 4176
Pub Type
Journals
Keywords
building technology, field test, fresh concrete, modelling, rheology, slump
Larrard, F.
and Ferraris, C.
(1998),
Rheologie du Beton Frais Remanie. I: Plan Experimental et Depouillement des Resultats, Bulletin des Laboratoires des Ponts et Chaussees
(Accessed October 5, 2024)