Abstract
A laboratory investigation into crude oil contaminated sand-concrete interface behavior is performed. The interface tests were carried out through a direct shear apparatus. Pure sand and sand-bentonite mixture with different crude oil contents and three concrete surfaces of different textures (smooth, semi-rough, and rough) were examined. The experimental results showed that the concrete surface texture is an effective factor in soil-concrete interface shear strength. The interface shear strength of the rough concrete surface was found higher than smooth and semi-rough concrete surfaces. In addition to the texture, the normal stress and the crude oil content also play important roles in interface shear strength. Moreover, the friction angle decreases with increasing crude oil content due to increase of oil concentration in soil and it increases with increasing interface roughness.
Highlights
The thin layer between structures and soil is often called soil–structure interface which transfers loads from structures to soil mass
Different types of apparatus were used in the previous studies such as direct shear apparatus, ring shear apparatus, dual shear apparatus, and simple shear apparatus
As can be seen on these Figures, at a fixed bentonite content, the maximum dry density of the contaminated soil increases with oil content and it is achieved in lower water content
Summary
The thin layer between structures and soil is often called soil–structure interface which transfers loads from structures to soil mass. As an early work which has been cited by many articles in the literature, Potyondy [4] conducted direct shear test on the interface of concrete, steel, and wood with sand, sandy silt, cohesive soil, rock flour (silt), and clay. He conducted tests for certain pre-set moisture contents as well as for dry specimens, and found that the frictional resistance of a soil depends on its sand content. Several other researchers such as Evgin and Fakharian [7], Hryciw and Irsyam [8], Uesugi et al [9], and Hu and Pu [10] conducted direct shear tests on the steel/concrete-sand interface in order to measure the interface frictional resistance
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