Lubrication layer properties during concrete pumping

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In order to progress in the understanding of the physical phenomena involved in the pumping process of concrete, we study in this work the properties of the lubrication layer, which forms between the pipe and the bulk material. Using ultrasonic velocity profiler, we measure the thickness of this lubrication layer in the case of real size pumping circuits. Our experimental, analytical and numerical results suggest that, from a rheological point of view, this layer behaves similarly as the constitutive mortar of the pumped concrete. Moreover, this layer thickness does not seem to depend on flow rate. We finally propose a simple analytical relation allowing for a rough estimation of the pumping pressure. (C) 2012 Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2013-03
Language
English
Article Type
Article
Keywords

SELF COMPACTING CONCRETE; RHEOLOGICAL BEHAVIOR; CEMENT PASTES; CONCENTRATED SUSPENSIONS; PARTICLE MIGRATION; TRANSIENT FLOW

Citation

CEMENT AND CONCRETE RESEARCH, v.45, pp.69 - 78

ISSN
0008-8846
DOI
10.1016/j.cemconres.2012.11.001
URI
http://hdl.handle.net/10203/173452
Appears in Collection
CE-Journal Papers(저널논문)
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