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This paper examines how the clay structure can be influenced by the interaction between shellfish fossil and amorphous silica with salt leaching. In marine clay, salt leaching behavior triggers the dissolution of both shellfish fossil and amorphous silica which influence the clay structure. In order to understand this interaction, a model system was introduced. The kaolinite was used to represent clay, while calcium carbonate (CaCO3) and sodium silicate (Na2SiO3) were used to represent shellfish fossil and amorphous silica, respectively. Samples combining various kinds of conditions are prepared. The shear strength was measured using vane shear test, while the microstructure of the samples was observed by using mercury intrusion porosimetry (MIP) test. The test results show that the silica addition has an important role for shear strength development because it reduces the macro pore in the sample, while calcium and salt do not give significant influence.
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