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• W4283577690 endingPage "4480" @default.
• W4283577690 startingPage "4480" @default.
• W4283577690 abstract "The aim of this study was to investigate the effect of roughness and relative density on the mechanical properties of sand-concrete pile interface. A series of direct shear tests were carried out on the interface using a large-scale direct shear apparatus with various relative densities of sand (73%, 47%, and 23%) and concrete blocks with four roughness values (I = 0, 10, 20, and 30 mm). Various mechanical properties (such as shear stress, volume change, peak shear strength, secant friction angle, and normalized friction coefficient) from the interface tests were compared with trends obtained from the pure sand direct shear test. For the smooth interface, the shear stress-horizontal displacement curves of the dense sand specimen exhibited a slight softening response, which became more apparent as the roughness increased. The curves of the loose sand specimen demonstrated a hardening response. The volumetric response was influenced by the combination of normal stress, relative density, and roughness. The peak shear strength demonstrated a nonlinear increasing trend as the normal stress increased. With an increase in the normal stress, the secant friction angle and peak friction coefficient decreased as exponential and power functions, respectively. Additionally, a critical roughness value Icr resulted from the tests, which halted the upward trend of the peak friction coefficient and normalized the secant friction angle when I exceeded Icr." @default.
• W4283577690 created "2022-06-28" @default.
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• W4283577690 date "2022-06-25" @default.
• W4283577690 modified "2023-10-10" @default.
• W4283577690 title "Experimental Investigation of the Mechanical Properties of the Sand–Concrete Pile Interface Considering Roughness and Relative Density" @default.
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• W4283577690 doi "https://doi.org/10.3390/ma15134480" @default.
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