Title:
Why Rheology Matters
Author(s):
Francois De Larrard
Publication:
Concrete International
Volume:
21
Issue:
8
Appears on pages(s):
79-81
Keywords:
Bingham model; high-performance concrete; materials science; mix proportioning; plastic viscosity; rheology
DOI:
Date:
8/1/1999
Abstract:
This article is aimed at convincing engineers that a rheological approach to fresh concrete is needed. Rheological concepts, including the Bingham model and the rheometer, are described. Then, an example of high-performance concrete (HPC) devoted to bridge construction is emphasized. It is shown that prevention of slump losses, pumpability and deck slope stability can be controlled with the help of a rheometer. Typical rheological specifications are given, and directions are proposed to adjust a HPC mixture to match those specifications.