Prediction of Concrete Rheology Based on Analytical Mix Design Model

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Title: Prediction of Concrete Rheology Based on Analytical Mix Design Model

Author(s): T.T. Roshavelov

Publication: Special Publication

Volume: 228

Issue:

Appears on pages(s): 97-110

Keywords: fresh concrete; mixture proportioning; rheology; self-consolidating concrete

Date: 6/1/2005

Abstract:
A large number of models have been developed recently in an attempt to link the parameters of the Bingham equation to concrete composition [1]. On the other hand, concrete mixture proportioning methods based on a rheological approach usually do not provide direct input of measurable rheological parameter(s) into the proportioning ex-pression. The theories underlying the design methodologies are usually based on a rheological model, but the parameter associated with the rheology of the system (for instance, the magnitude of the relative viscosity) is an adjustable (arbitrary) constant. Consequently, in a broad sense, a universal method for concrete mixture proportioning based on rheological characteristics has not been proposed until now. In this paper, an attempt has been made to associate the rheological quantity involved in an analytical model for mixture proportioning with a measurable rheological characteristic. To do this, the results from evaluation of concrete rheology using a newly developed capillary viscometer are compared with calculated apparent viscosities by the model on a series of concrete mixtures (conventional and self-consolidated). The agreement of the experi-mental results with the theoretical prediction of the model proved to be encouraging. The application of the approach and a new viscometer for self-consolidating concrete technology is believed to be innovative.