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Geomechanics and Engineering Volume 13, Number 3, September 2017 , pages 459-474 DOI: https://doi.org/10.12989/gae.2017.13.3.459 |
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Mechanical properties of expanded polystyrene beads stabilized lightweight soil |
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Mingdong Li, Kejun Wen, Lin Li and Anguo Tian
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| Abstract | ||
| To investigate the mechanical properties of Expanded Polystyrene (EPS) Beads Stabilized Lightweight Soil (EBSLS), Laboratory studies were conducted. Totally 20 sets of specimens according to the complete test design were prepared and tested with unconfined compressive test and consolidated drained triaxial test. Results showed that dry density of EBSLS (0.67-1.62 g/cm3) decreases dramatically with the increase of EPS beads volumetric content, while increase slightly with the increase of cement content. Unconfined compressive strength (10-2580 kPa) increases dramatically in parabolic relationship with the increase of cement content, while decreases with the increase of EPS beads volumetric content in hyperbolic relationship. Cohesion (31.1-257.5 kPa) increases with the increase of cement content because it is mainly caused by the bonding function of hydration products of cement. The more EPS beads volumetric content is, the less dramatically the increase is, which is a result of the cohesion between hydration products of cement and EPS beads is less than that between hydration products of cement and sand particles. Friction angle (14.92-47.42°) decreases with the increase of EPS beads volumetric content, which is caused by the smoother surfaces of EPS beads than sand grains. The stress strain curves of EBSLS tend to be more softening with the increase of EPS beads content or the decrease of cement content. The shear contraction of EBSLS increases with the increase of ce or the decrease of cc. The results provided quantitative relationships between physico-mechanical properties of EBSLS and material proportion, and design process for engineering application of EBSLS. | ||
| Key Words | ||
| lightweight soil; density; strength; cohesion; friction angle; deformation behavior | ||
| Address | ||
| (1) Mingdong Li: HoHai University, Nanjing, Jiangsu 210098, ChinaHoHai University, Nanjing, Jiangsu 210098, China; (2) Mingdong Li, Anguo Tian: School of Civil Engineering, Huaihai Institute of Technology, 59 Cangwu Road, Lianyungang, Jiangsu 222005, China; (3) Kejun Wen, Lin Li: Department of Civil and Environmental Engineering, Jackson State University, 1400 J.R. Lynch Street, Jackson, MS, 39217, USA. | ||