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Crushability on granular materials by strain controlled oedometer testing at high stress levels

Gemmina Di Emidio (UGent) , Daniel Verastegui (UGent) and William Van Impe (UGent)
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Abstract
The crushability of artificial and natural granular materials has been analyzed using one-dimensional strain-controlled compression tests and standard oedometer tests at high stress levels to study the effect on the breakage of a number of parameters such as: grain mineralogy, grain size, uniformity coefficient, strain rate and loading time. Measuring the breakage factor at different stages of compression, it was demonstrated that the crushing started before reaching the point of maximum curvature (yield point) in the compressibility curve. Beyond yielding the crushing increased abruptly. Among the natural materials analyzed, the lowest yield stress value occurs in the carbonate sand, and the highest in the silica sand. We found that the breakage increases with increasing size of the grains. Coarse uniform samples showed higher breakage than uniform fine samples and well-graded samples. The breakage increased with decreasing strain rate or increasing load application time. For natural soils it is difficult to study separately the influence of isolated parameters on the breakage. The study of homogeneous artificial materials facilitated this analysis.
Keywords
granular material, compression, crushability, high stress levels

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Chicago
Di Emidio, Gemmina, Ramiro Verastegui Flores, and William Van Impe. 2009. “Crushability on Granular Materials by Strain Controlled Oedometer Testing at High Stress Levels.” In Proceedings of the 17th International Conference on Soil Mechanics and Geotechnical Engineering : the Academia and Practice of Geotechnical Engineering, ed. Mamdouh Hamza, Marawan Shahien, and Yasser El-Mossalbami, 127–130. Amsterdam, The Netherlands: IOS Press.
APA
Di Emidio, G., Verastegui Flores, R., & Van Impe, W. (2009). Crushability on granular materials by strain controlled oedometer testing at high stress levels. In Mamdouh Hamza, M. Shahien, & Y. El-Mossalbami (Eds.), Proceedings of the 17th International conference on Soil Mechanics and Geotechnical Engineering : the academia and practice of geotechnical engineering (pp. 127–130). Presented at the 17th International conference on Soil Mechanics and Geotechnical Engineering, Amsterdam, The Netherlands: IOS Press.
Vancouver
1.
Di Emidio G, Verastegui Flores R, Van Impe W. Crushability on granular materials by strain controlled oedometer testing at high stress levels. In: Hamza M, Shahien M, El-Mossalbami Y, editors. Proceedings of the 17th International conference on Soil Mechanics and Geotechnical Engineering : the academia and practice of geotechnical engineering. Amsterdam, The Netherlands: IOS Press; 2009. p. 127–30.
MLA
Di Emidio, Gemmina, Ramiro Verastegui Flores, and William Van Impe. “Crushability on Granular Materials by Strain Controlled Oedometer Testing at High Stress Levels.” Proceedings of the 17th International Conference on Soil Mechanics and Geotechnical Engineering : the Academia and Practice of Geotechnical Engineering. Ed. Mamdouh Hamza, Marawan Shahien, & Yasser El-Mossalbami. Amsterdam, The Netherlands: IOS Press, 2009. 127–130. Print.
@inproceedings{1004656,
  abstract     = {The crushability of artificial and natural granular materials has been analyzed using one-dimensional strain-controlled compression tests and standard oedometer tests at high stress levels to study the effect on the breakage of a number of parameters such as: grain mineralogy, grain size, uniformity coefficient, strain rate and loading time. Measuring the breakage factor at different stages of compression, it was demonstrated that the crushing started before reaching the point of maximum curvature (yield point) in the compressibility curve. Beyond yielding the crushing increased abruptly. Among the natural materials analyzed, the lowest yield stress value occurs in the carbonate sand, and the highest in the silica sand. We found that the breakage increases with increasing size of the grains. Coarse uniform samples showed higher breakage than uniform fine samples and well-graded samples. The breakage increased with decreasing strain rate or increasing load application time. For natural soils it is difficult to study separately the influence of isolated parameters on the breakage. The study of homogeneous artificial materials facilitated this analysis.},
  author       = {Di Emidio, Gemmina and Verastegui, Daniel and Van Impe, William},
  booktitle    = {Proceedings of the 17th International conference on Soil Mechanics and Geotechnical Engineering : the academia and practice of geotechnical engineering},
  editor       = {Hamza, Mamdouh and Shahien, Marawan and El-Mossalbami, Yasser},
  isbn         = {9781607500315},
  keyword      = {granular material,compression,crushability,high stress levels},
  language     = {eng},
  location     = {Alexandria, Egypt},
  pages        = {127--130},
  publisher    = {IOS Press},
  title        = {Crushability on granular materials by strain controlled oedometer testing at high stress levels},
  url          = {http://dx.doi.org/10.3233/978-1-60750-031-5-127},
  year         = {2009},
}

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