ABSTRACT
The paper aims at describing the advantageous aspects of cement-treated marine clay (CTC) mixed with tire-chips which have been counted as one of the promising recycled materials used in geoenvironmental engineering. In particular, a focus is placed on characteristics of toughness improvement of CTC caused by addition of tire-chips. The results from both tests elucidate that the toughness increases with increasing the content of tire-chips at least up to 30% in volume. In order to describe the undrained stress-strain behaviour of CTC with tire-chips, an attempt was made to propose an elasto-plastic constitutive model in which the sub-loading surface concept and the crack-damage theory are taken into consideration. The proposed model is capable for description of softening and hardening behaviour which depends upon the severity of toughness of CTC with tire-chips observed in stress-strain curves in undrained compression tests.
