Testing and Modeling of Fresh Concrete Rheology.
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.
Building and Fire Research Laboratory
National Institute of Standards and Technology
Gaithersburg, MD 20899