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Non-destructive evaluation of stiffness moduli of cemented soil out of resonant frequency

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Abstract
The objective of this research was to determine small-strain stiffness of cement-treated clay by means of the free-free resonant column test. In the test, a cylindrical soil specimen is laid on top of a soft foam layer to simulate fully free boundary conditions. Next an accelerometer is put in contact with one end of the specimen to measure vibrations while the other end is impacted with a light hammer. Knowing the density, dimensions and fundamental frequency of vibration, the small-strain moduli can be evaluated. Factors that can affect the outcome, include the actual boundary conditions of the sample, the interference of the accelerometer on the vibrational response of the sample and the shape of the sample given by the ratio diameter to length. In order to verify the reliability of the measurements, the free-free resonant column test was compared with a more robust technique like the laser doppler vibrometer. Furthermore the impact of the samples shape was investigated through numerical modal analysis from which also correction factors were proposed to improve the reliability of the interpretations.
Keywords
cement, resonant frequency, laboratory testing, clay, stiffness

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Please use this url to cite or link to this publication:

Chicago
Verastegui Flores, Ramiro, Gemmina Di Emidio, Adam Bezuijen, Joachim Vanwalleghem, and Mathias Kersemans. 2015. “Non-destructive Evaluation of Stiffness Moduli of Cemented Soil Out of Resonant Frequency.” Ed. Akira Murakami. Soils and Foundations 55 (5).
APA
Verastegui Flores, R., Di Emidio, G., Bezuijen, A., Vanwalleghem, J., & Kersemans, M. (2015). Non-destructive evaluation of stiffness moduli of cemented soil out of resonant frequency. (A. Murakami, Ed.)SOILS AND FOUNDATIONS, 55(5).
Vancouver
1.
Verastegui Flores R, Di Emidio G, Bezuijen A, Vanwalleghem J, Kersemans M. Non-destructive evaluation of stiffness moduli of cemented soil out of resonant frequency. Murakami A, editor. SOILS AND FOUNDATIONS. 2015;55(5).
MLA
Verastegui Flores, Ramiro et al. “Non-destructive Evaluation of Stiffness Moduli of Cemented Soil Out of Resonant Frequency.” Ed. Akira Murakami. SOILS AND FOUNDATIONS 55.5 (2015): n. pag. Print.
@article{5991387,
  abstract     = {The objective of this research was to determine small-strain stiffness of cement-treated clay by means of the free-free resonant column test. In the test, a cylindrical soil specimen is laid on top of a soft foam layer to simulate fully free boundary conditions. Next an accelerometer is put in contact with one end of the specimen to measure vibrations while the other end is impacted with a light hammer. Knowing the density, dimensions and fundamental frequency of vibration, the small-strain moduli can be evaluated. Factors that can affect the outcome, include the actual boundary conditions of the sample, the interference of the accelerometer on the vibrational response of the sample and the shape of the sample given by the ratio diameter to length. In order to verify the reliability of the measurements, the free-free resonant column test was compared with a more robust technique like the laser doppler vibrometer. Furthermore the impact of the samples shape was investigated through numerical modal analysis from which also correction factors were proposed to improve the reliability of the interpretations.},
  author       = {Verastegui Flores, Ramiro and Di Emidio, Gemmina and Bezuijen, Adam and Vanwalleghem, Joachim and Kersemans, Mathias},
  editor       = {Murakami, Akira},
  issn         = {0038-0806},
  journal      = {SOILS AND FOUNDATIONS},
  keywords     = {cement,resonant frequency,laboratory testing,clay,stiffness},
  language     = {eng},
  number       = {5},
  title        = {Non-destructive evaluation of stiffness moduli of cemented soil out of resonant frequency},
  volume       = {55},
  year         = {2015},
}