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Testing and Modeling of Fresh Concrete Rheology.


pdf icon Testing and Modeling of Fresh Concrete Rheology. (5994 K)
Ferraris, C. F.; deLarrard, F.

NISTIR 6094; 69 p. February 1998.

Available from:

National Technical Information Service
Order number: PB98-133507

Keywords:

concretes; building technology; field test; slump; fresh concrete; rheology; modeling

Abstract:

This report presents the results of an experimental program dealing with the rheology of fresh concrete. The three main goals were to: 1) Obtain rheological data on concretes of various mixture compositions, 2) Establish models to link mixture composition with rheological parameters, and 3) Develop a simple field test for determination of rheological parameters. Approximately 80 mixtures [mortars and concretes, with and without High-Range-Water Reducer Admixtures (HRWRA)] were formulated and tested. The rheological characteristics of the mixtures were measured using a rheometer, developed at the Laboratoire Central des Ponts et Chaussees (Paris, France) named BTRHEOM, with parallel tests using the slump cone. The relationship between the torque and rotational speed of the rheometer is not linear, implying a non-linear relationship between stress and strain rate for concrete.