Abstract
The rheological behaviour of fresh high performance concrete was investigated by use of a coaxial cylinder viscometer (BML Viscometer). After a series of experiments it was observed that the equipment used was not very suitable for concrete mixes with slump values of less than approximately 10 cm. Also, for almost all mixes with a slump of less than 20 cm, plug flow occurred. By use of nonlinear regression analysis, however, a method for the determination of the two Bingham constants is proposed, even when plug flow occurs. Using these Bingham constants, the predicted slump values obtained from a chart established by computer simulation showed good correlation with those observed experimentally. A model for the prediction of plastic viscosity based on Farris' theory is also proposed. With two adjustable parameters the model gave a good description of the various concrete mixes tested.
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