Abstract
ABSTRACT This paper reports a series of laboratory tests on sand-concrete friction under two-way repeated loading with a simple shear type apparatus. Under monotonic loading, the tangential displacement mostly consists of the shear deformation of sand mass before the yielding of interfaces. After the yielding, the interface sliding becomes the major factor of tangential displacement. The maximum coefficient of sand-concrete friction depends on the surface roughness of concrete and the mean diameter of sand. These effects are combined into the influence of Normalized Roughness of the interfaces. The shear strength of sand affects the upper limit to the coefficient of friction. The residual coefficient of friction under two-way repeated loading coincides with that under monotonic loading. A shear zone forms along a sand-concrete interface during the sliding. Shear zone formation explains the reduction of upper limit to the coefficient of friction. These characteristics of sand-concrete friction are similar to those of friction between sand and rough steel surfaces.
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