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Materials 2017, 10(4), 401; doi:10.3390/ma10040401

Small Strain Stiffness of Unsaturated Sands Containing a Polyacrylamide Solution

1
School of Civil Engineering, Chungbuk National University, Cheongju, Chungbuk 28644, Korea
2
Department of Civil and Environmental Engineering, National University of Singapore, Singapore 117576, Singapore
3
Department of Civil and Environmental Engineering, Pusan National University, Busan 46241, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Jorge de Brito
Received: 9 March 2017 / Revised: 30 March 2017 / Accepted: 5 April 2017 / Published: 11 April 2017
(This article belongs to the Section Porous Materials)
View Full-Text   |   Download PDF [1710 KB, uploaded 12 April 2017]   |  

Abstract

Sand improvements using organic agents have shown promising results. Polyacrylamide is one possible organic agent, which has been shown to influence the shear strength, stiffness, soil remediation, and erosion resistance of geomaterials. In this study, we explored the shear wave velocity (S-wave) and water retention curves of unsaturated sands containing polyacrylamide solutions. The shear wave velocity was measured during the water retention curve measurement tests according to the variation of the degree of saturation. The experimental setup was verified through comparison of the measured water retention curves with the published data. The results show that (1) the S-wave velocity of saturated sands increases with polyacrylamide concentration; (2) as the degree of saturation decreases, the S-wave velocity increases; (3) near the residual water (or polyacrylamide solution) saturation, the S-wave velocity increases dramatically; (4) as the degree of saturation decreases, the S-wave velocity at unsaturated conditions increases with any given water (or polyacrylamide solution) saturation, like the water retention curves; (5) the S-wave velocity increases with the increase in capillary pressure; and (6) the predicted S-wave velocity at a given degree of saturation is slightly overestimated, and the modification of the equation is required. View Full-Text
Keywords: small strain stiffness; shear wave velocity; polyacrylamide; unsaturated sand small strain stiffness; shear wave velocity; polyacrylamide; unsaturated sand
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Jung, J.; Ku, T.; Ahn, J. Small Strain Stiffness of Unsaturated Sands Containing a Polyacrylamide Solution. Materials 2017, 10, 401.

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