End-Friction Effect on Concrete Cubes with Passive Confinement
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 8
Abstract
True-triaxial test data are fundamental in obtaining the constitutive laws of fiber-reinforced polymer (FRP)—confined concrete, especially concrete under nonuniform (passive) confinement. A new true-triaxial test system, which exerts passive confinement on concrete cubes, has been developed by the authors to fill the passive confinement gap in existing tests. To obtain true constitutive behavior from cube testing, it is essential to resolve the end-friction effect. In this study, the design of a friction reduction pad with polytetrafluoroethylene (PTFE) sheets was investigated, and a quantitative analysis was carried out to determine the pad’s friction reduction performance. Moreover, an equivalent confinement method was proposed to quantify pad performance under different pad configurations. The results demonstrate that a two-ply greased PTFE pad works efficiently for concrete under uniaxial compression. However, it does not prevent end friction from regenerating in the strain-hardening stage in passively confined concrete. The equivalent confinement method was further developed to quantify the regenerated end-friction effect and to obtain the inherent constitutive behavior of concrete under uniform passive confinement in a true-triaxial test system. This study is the first quantitative investigation of friction reduction performance specifically for concrete cubes with strain-hardening behavior.
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Acknowledgments
The work described in this paper was fully supported by the National Natural Science Foundation of China (Grant No. 51308404) and the Fundamental Research Funds for the Central Universities, China. The authors would also like to acknowledge the suggestions provided by Professor Kent A. Harries.
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Published In
Journal of Materials in Civil Engineering
Volume 30 • Issue 8 • August 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Mar 23, 2017
Accepted: Jan 12, 2018
Published online: Jun 9, 2018
Published in print: Aug 1, 2018
Discussion open until: Nov 9, 2018
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