| With the development of the automobile industries at home and abroad, the growing amount of waste rubber produced from scrap tires has resulted in an environmental problem. The utilization of scrapped rubber tyre in cement-soil has attracted attention with both energy crisis and the rise of environmental consciousness. Rubberized cement-soil (RCS for short) is a new type cement-soil, which is made by forced mixing soft soil, crumb rubber, cement and so on after a serial of physical and chemical reactions.The preparation method of RCS clay samples is modified based on former researches. The variation laws of dynamic elastic modulus and damping ratio for composite sample of RCS are studied experimentally by means of dynamic triaxial test. Emphasis is laid on the influence of confining pressure and rubber powder content ratio and replacement ratio and analysis their inner mechanisms, which led to several conelusions useful to seismic design in engineering practiee.Test study on dynamic strength of RCS: The relationship of RCS is similar to those of pure clay. Test results indicated that dynamic strength decreases as the confining pressure increases; dynamic strength increases as the rubber powder ratio increases; dynamic strength decreases as the replacement ratio increases.Test study on dynamic elastic modulus and damping ratio of RCS: The relationship of RCS is similar to those of pure clay. Test results indicated that dynamic elastic modulus increases and damping ratio decreases as the confining pressure increases; dynamic elastic modulus decreases and damping ratio increases as the rubber powder ratio increases; dynamic elastic modulus increases and damping ratio decreases as the replacement ratio increases. And a simple for calculating the dynamic elastic modulus and damping ratio is proposed.Some conclusions of RCS are summarized by dynamic triaxial tesx, which will be a useful referce to reasonable foundations treatment in similar engineering practice afterword.
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