The purpose of this study is to evaluate both the failure and permeability properties of cement treated clay with tire chips under shear deformation using a micro focus X-ray CT scanner. It is possible to observe internal structure and crack growth of cement treated clay with tire chips using X-ray CT scanner. And then, density distribution of cement treated clay with tire chips was investigated based on the result of CT scanning with image processing analysis. Following conclusions are drawn from this study:
1) Tire chips are found to be well mixed in cement treated clay if the volume of tire chips for cement treated clay is less than around 29%. In addition, the tire chip is isolated and suspended the matrix of cement treated clay.
2) It is possible to change crack form of cement treated clay under shear deformation by mixing tire chips. That is, the cracks in cement treated clay are almost straight and their thickness widened as axial strain increased. In contrast, the cracks in the cement treated clay with tire chips are thin and developed successively in a reticulated pattern as axial strain increased.
3) The coefficient of permeability of cement treated clay with tire chips under shear deformation is smaller than that of without tire chips.