Behavior of compacted clay-concrete interface

Abstract

Tests of interface between compacted clay and concrete were conducted systematically using interface simple shear test apparatus. The samples, having same dry density with different water content ratio, were prepared. Two types of concrete with different surface roughness, i.e., relatively smooth and relatively rough surface roughness, were also prepared. The main objectives of this paper are to show the effect of water content, normal stress and rough surface on the shear stress-shear displacement relationship of clay-concrete interface. The following were concluded in this study: 1) the interface shear sliding dominates the interface shear displacement behavior for both cases of relatively rough and smooth concrete surface except when the clay water content is greater than 16% for the case of rough concrete surface where the shear failure occurs in the body of the clay sample; 2) the results of interface shear strength obtained by direct shear test were different from that of simple shear test for the case of rough concrete surface; 3) two types of interface failure mechanism may change each other with different water content ratio; 4) the interface shear strength increases with increasing water content ratio especially for the case of clay-rough concrete surface interface.

Keywords

soil structure interaction / simple shear test / interface / friction / compacted clay / interface modeling

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Acknowledgements

This research was supported by the China Scholarship Council (No. 2006368T15). Financial support from project "Test study on the properties of coarse-grained soils for high earth rockfill dam under high and complex stress conditions" from the National Nature Science Foundation of China (Grant No. 50639050) and Er-Tan hydraulicpower limited company is appreciated. The authors would like to thank Mr. Zhang Yangga and the technician of the laboratory in the Geotechnical Research Institute Mrs. Yun Yan for their assistance at the primary stage of laboratory work.

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