Breakage Characteristics and Crushing Mechanism of Cement Materials Using Point-Loading Tests and the Discrete-Element Method
Publication: Journal of Materials in Civil Engineering
Volume 26, Issue 5
Abstract
A point-loading device was used to research the breakage characteristics of single particles and to study their crushing mechanism. A series of point-loading tests were completed on the basis of cement ellipsoid particles modeled in various sizes and strengths with cement pastes. A close-packing method of equal spheres with several close-packed assemblies was generated, and the corresponding numerical models for cement ellipsoid particles were established by the discrete-element method. Experimental and numerical tests show that the high-strength materials are brittle, whereas the low-strength materials are ductile, and vice versa. A comparison of the experimental and numerical results show reasonable, rational results, and indicate that the force-displacement relationship is approximately linear for this type of granular material. A measurement-sphere method was used to trace the energy and stress distribution in the particle samples. The accumulation of dilatant deformation causes the collapse of the local skeleton structures in the cement ellipsoid particles.
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Acknowledgments
The work presented in this paper was supported by the project of National Basic Research Program of China (2010CB732103), Natural Science Foundation of China (51109117), Independent Research Plan of Tsinghua University (20111081125), and State Key Laboratory of Hydroscience and Engineering Project (2012-KY-02).
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Information
Published In
Journal of Materials in Civil Engineering
Volume 26 • Issue 5 • May 2014
Pages: 992 - 1002
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Apr 6, 2013
Accepted: Jun 10, 2013
Published online: Jun 13, 2013
Discussion open until: Nov 13, 2013
Published in print: May 1, 2014
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