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http://dx.doi.org/10.5345/JKIBC.2014.14.2.118

Prediction of Pumping Friction Resistance Coefficient in Pipe Influenced by Concrete Rheology Properties  

Kim, Hyung-Rae (R&D Division, Hyundai Engineering & Construction)
Cho, Ho-Kyoo (R&D Division, Hyundai Engineering & Construction)
Kim, Jung-Chul (R&D Division, Hyundai Engineering & Construction)
Lee, Kewn-Chu (R&D Division, Hyundai Engineering & Construction)
Publication Information
Journal of the Korea Institute of Building Construction / v.14, no.2, 2014 , pp. 118-126 More about this Journal
Abstract
The establishment of the technology for evaluating friction resistance and pipe pressure and the relation of the fluid characteristics and pumpability of concrete is essential for concrete pumping performance for the rapid construction of super-tall buildings. In this study, a quantitative evaluation of concrete fluid characteristics and surface friction resistance was performed, applying different concrete mix proportions and pumping conditions. To achieve this, we developed a temporary horizontal pumping evaluation system to measure pipe pressure and surface friction characteristics, and performed an experiment to investigate the relations between concrete rheology characteristics and friction resistance in pipe. The experiment found that in terms of the rheology characteristics, plastic viscosity was reduced remarkably after pumping. As well, high regression between the surface friction and pressure gradient was confirmed. This means that it is possible to evaluate the friction resistance between concrete and pipe by means of a pumping system that includes a frictional resistance testing pipe. In addition, high regression between the plastic viscosity of concrete after pumping and friction resistance coefficient was confirmed. Finally, it is considered that pumping pressure can be predicted using the friction resistance coefficient derived in this study, and it has high regression.
Keywords
concrete pumping; rheology; friction resistance coefficient;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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