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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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Effects of an externally imposed electromagnetic field on the formation of a lubrication layer in concrete pumping

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Title
Effects of an externally imposed electromagnetic field on the formation of a lubrication layer in concrete pumping
Author
Choi, Myoung SungKim, Yu SeungKim, Jae HongKim, Jeong-SuKwon, Seung Hee
Keywords
Concrete pumping; Discharge rates; Lubrication layer; Pump pressures; Pumpability; Pumping tests; Water molecule
Issue Date
201406
Publisher
ELSEVIER SCI LTD
Citation
CONSTRUCTION AND BUILDING MATERIALS, v.61, no., pp.18 - 23
Abstract
During concrete pumping, a lubrication layer is formed at the interface between the concrete and the pipe. The pumpability highly depends on the characteristics of this layer. In this study, a method to enhance the pumpability by externally imposing an electromagnetic field on the pipe was suggested and experimentally verified. The electromagnetic field activates the free movement of the water molecules so that the layer is expected to become more slippery. Pumping tests with a 1000 m long pipeline were conducted with and without applying an electromagnetic field. When the electromagnetic field was imposed, the same discharge rate could be obtained with a 30% reduction in the pump pressure, and a 15% increase in the velocity under the same pump pressure was observed. The tests revealed that the imposition of an electromagnetic field was very effective in improving the pumpability.
URI
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DOI
http://dx.doi.org/10.1016/j.conbuildmat.2014.02.071
ISSN
0950-0618
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