behavior of clayey soils mixed with tire chips

recently, mixtures of clay-tire chips are used as construction material in civil engineering projects. with respect to the tending for using these materials, it is necessary to know their mechanical behavior. thereby, a number of undrained monotonic triaxial tests are carried out on the specimens of pure clay and clay-tire chip mixtures. mixed specimens prepared by mixing pure clay with 10%, 20%, and 30% tire chips in weight. the results of the tests indicate that shear strength and pore water pressure due to shearing depend on the amount of tire-chips and clay type. as dependent on the clay type used in the mixtures, there is an optimum content for tire-chips to mix with the clay.