| Reference Type | Journal (article/letter/editorial) |
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| Title | The variation of elastic wave velocities and quality factor Q of a sandstone with moisture content |
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| Journal | Canadian Journal of Earth Sciences |
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| Authors | Pandit, B. I. | Author |
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| King, M. S. | Author |
| Year | 1979 (December 1) | Volume | 16 |
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| Issue | 12 |
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| Publisher | Canadian Science Publishing |
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| DOI | doi:10.1139/e79-206Search in ResearchGate |
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| Generate Citation Formats |
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| Mindat Ref. ID | 476116 | Long-form Identifier | mindat:1:5:476116:1 |
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| GUID | 0 |
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| Full Reference | Pandit, B. I., King, M. S. (1979) The variation of elastic wave velocities and quality factor Q of a sandstone with moisture content. Canadian Journal of Earth Sciences, 16 (12) 2187-2195 doi:10.1139/e79-206 |
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| Plain Text | Pandit, B. I., King, M. S. (1979) The variation of elastic wave velocities and quality factor Q of a sandstone with moisture content. Canadian Journal of Earth Sciences, 16 (12) 2187-2195 doi:10.1139/e79-206 |
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| In | (1979, December) Canadian Journal of Earth Sciences Vol. 16 (12) Canadian Science Publishing |
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| Abstract/Notes | Elastic wave velocities and the quality factor Q were measured on specimens of Berea Sandstone as their water vapor content was increased by exposure to an environment of increasing relative humidity (RH). At a maximum value of RH (= 0.98), the moisture absorbed was about 0.15% (vs. 9.62% for full saturation) of their dry mass.The bar velocities in the torsional and longitudinal vibrational modes were measured in the frequency range 1–20 kHz, while the pulse first-arrival compressional and shear-wave velocities were obtained at 820 kHz. Over the range of variation in relative humidity from 0.0 (vacuum ~1 Torr) to 0.98 the velocities showed a decrease of 20–30%, the bar velocities undergoing the greater change. Over the same range the Poisson's ratio fell from 0.2 to 0.1.The value of the quality factor Q fell sharply from ~200 to ~50 during the initial increase (about 0.01% by weight) in the moisture content. Further addition of water vapor produced no significant change in Q for either mode. Also, no systematic variation of Q with frequency was observed. However, when the amount of moisture in the specimens increased to about 0.15% by weight, not only did the Q values decrease but also began to show a frequency dependence. This change in the frequency variation of Q suggest that, while the water molecule layers initially absorbed by the specimens form a solid phase, a thickness is reached beyond which they depict bulk water behavior. A rough estimate of this thickness was found to be about 110 Å.On a mesuré la vitesse des ondes élastiques et le facteur de qualité Q sur des spécimens de grès de Berea lorsqu'on augmentait leur teneur en vapeur d'eau par exposition à un milieu d'humidité relative (HR) croissante. Pour la valeur maximale de HR (= 0.98), l'humidité absorbée était d'environ 0.15% (par rapport à 9.62% pour la saturation complète) de la masse à l'état sec. |
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