Title: Evaluation of fresh high performance concretes behavior by rheometer assistance

Author(s): Alessandra Lorenzetti Castro, Jefferson Liborio, Victor Carlos Pandolfelli

Publication: IBRACON

Volume: 2

Issue: 4

Appears on pages(s): 282-293

Keywords: high performance concrete; workability; rheology; rheometer

DOI:

Date: 12/4/2009

Abstract:
To study the behavior of fresh concrete, nothing is more appropriate than applying the concepts of rheology. It is known that this material behaves as a Bingham fluid and two rheological parameters are needed to describe it: yield stress and plastic viscosity. In recent years, rheology of fresh concrete has been studied with the aid of the slump test or with rheometers. As the slump test does not seem to describe its rheological behavior correctly, this paper presents an evaluation of fresh high performance concrete behavior using a rheometer. Based on the flow curves, their rheological nature and parameters that describe their behavior can be observed. Moreover, the influence of composition and the mixing procedure can be observed as well as the workability evolution over time.