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Kim, Jae Hong
Research Group for Concrete Structures and Materials
Research Interests
  • Mechanics of Concrete, Rheology, Structural Analysis, Construction Performance

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Cement particle flocculation and breakage monitoring under Couette flow

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Title
Cement particle flocculation and breakage monitoring under Couette flow
Author
Yim, Hong JaeKim, Jae HongShah, Surendra P.
Keywords
Aggregate particles; Cement paste; Cluster-size distribution; Laser backscattering; Parallel plate rheometers; Physical factors; Rheological behaviors; Rheological property
Issue Date
201311
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
CEMENT AND CONCRETE RESEARCH, v.53, no., pp.36 - 43
Abstract
Freshly mixed concrete is a suspension of cement and aggregate particles dispersed in water. To secure the desired quality of freshly mixed concrete, understanding its rheological behavior, which depends on its flow rate, is necessary. A number of chemical and physical factors influence the rheology of freshly mixed concrete, and the flocculation of cement particles is thought to cause thixotropy and shear thinning. This study proposes a rheometer coupled with a laser backscattering device, which allows us to simultaneously measure the viscosity and the size distribution of cement clusters in cement paste suspension. The laser backscattering instrument measures the cluster size distribution and monitors its growth or breakdown, while the parallel-plate rheometer measures its rheological properties. As a result, the change of cement grains was continuously observed with the change of shear stress under specific strain rates of 1 s- 1, 10 s- 1, and 100 s- 1.
URI
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DOI
http://dx.doi.org/10.1016/j.cemconres.2013.05.018
ISSN
0008-8846
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