Fillers to lessen shear thickening of cement powder paste

Maybury, J., Ho, J. C. M. and Binhowimal, S. A. M. (2017) Fillers to lessen shear thickening of cement powder paste. Construction and Building Materials, 142 268-279. doi:10.1016/j.conbuildmat.2017.03.076

Author Maybury, J.
Ho, J. C. M.
Binhowimal, S. A. M.
Title Fillers to lessen shear thickening of cement powder paste
Journal name Construction and Building Materials   Check publisher's open access policy
ISSN 0950-0618
Publication date 2017-07-01
Sub-type Article (original research)
DOI 10.1016/j.conbuildmat.2017.03.076
Open Access Status Not yet assessed
Volume 142
Start page 268
End page 279
Total pages 12
Place of publication Amsterdam, Netherlands
Publisher Elsevier BV
Language eng
Abstract Superplasticiser (SP) is an indispensable ingredient in the production of contemporary concrete, which is designed to satisfy multi-concurrent performance criteria such as strength, flowability, passing ability, segregation and dimensional stability. Use of SP can decrease flocculation of fine powder and enhance the workability of concrete. However, at the same time it increases the shear thickening of concrete resulting in reduced pumping distance, less uniform mixing and more difficult on-site manual handling, e.g. shovelling or surface trowelling. Therefore, the SP dosage for concrete mix design should be limited, or more practically, fillers should be added to reduce the shear thickening. This paper proposes to decrease the shear thickening of cement powder paste by replacing part of the cement with an equal volume of filler. From the test results, it was evident that when fly ash, silica fume or limestone is added to replace cement, the shear thickening decreases significantly. Also, it was found that the shear thickening of cement powder paste can be correlated negatively to the wet packing density. As the wet packing density increases, the tendency of having clustering of particles or free polymer chains from the SP decreases and thus shear thickening.
Keyword Cement powder paste
Plastic viscosity
Shear thickening
Wet packing density
Yield stress
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
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