Abstract

Rheological measurements have been undertaken to illustrate the applicability on fresh self-compacting concrete of a model for the relative viscosity and yield stress of suspensions. The model is based on linear viscoelasticity and classical theory for composite materials and it takes into account the amount, shape (aspect ratio of ellipsoids), and maximum packing density of the particles (here aggregates), as well as the rheological properties of the matrix (here mortar). Self-compacting concretes made from different types of coarse aggregates: spheres (glass beads), sea dredged, crushed, and a mix of sea dredged and crushed aggregates, have been tested in a coaxial cylinder concrete rheometer (BML). The investigations indicate that the aspect ratio, angularity, and surface texture of aggregates affect the viscosity and yield stress. The magnitude of these effects depends on the property in question, viscosity and yield stress.

Issue Section:
Research Papers
Keywords:
self-compacting concrete, rheological properties, modelling, coarse aggregate, viscosity, yield stress

References

1.
Brandl
,
M.
 and
Thrane
,
L. N.
,
2001
, “
Rheological properties of self-compacting concrete
,” M.Sc. thesis, Dept. of Civil Engineering,
Technical University of Denmark
,
2001
.
2.
de Larrard
,
F.
,
1999
, “
Concrete Mixture Proportioning. A Scientific Approach
,”
E FN Spon
, London.
3.
Ferraris
,
C. F.
 and
de Larrard
,
F.
,
1998
, “
Testing and Modeling of Fresh Concrete Rheology
,”
National Institute of Standards and Technology
, Washington DC, NIST Report 6094.
4.
Geiker
,
M. R.
,
Brandl
,
M.
,
Thrane
,
L. N.
,
Bager
,
D. H.
, and
Wallevik
,
O.
,
2001
, “
On The Effect of Measuring Procedure on The Apparent Rheological Properties of Self-Compacting Concrete
,” Accepted by
Cement and Concrete Research
,
01
2002
.
5.
Hackley
,
V. A.
 and
Ferraris
,
C. F.
 “
Guide to rheological nomenclature: Measurements in ceramic particulate systems
,”
National Institute of Standards and Technology
,
Washington DC
,
NIST SP 946
.
6.
Nielsen
,
L. F.
,
2001
, “
Rheology of Some Extreme Liquid Composites such as Self-Compacting Concretes
,” Submitted to Nordic Concrete Research, No.
27
, pp.
83
–
93
.
This content is only available via PDF.
All rights reserved. This material may not be reproduced or copied, in whole or in part, in any printed, mechanical, electronic, film, or other distribution and storage media, without the written consent of ASTM International.
You do not currently have access to this content.