This paper presented the results of the investigations on the liquefaction potential and the
dynamic properties of sand-tyre chip (STCh) mixtures. A series of strain controlled
consolidated undrained cyclic triaxial tests were carried out on specimens of sand mixed
with varying proportions of tyre chips (TCh). The specimens of STCh mixture were prepared
at a constant initial relative density and tested at an effective confining pressure of 69 kPa.
The results show that TCh significantly reduces the liquefaction potential of sand with the
addition of gravimetric proportion of TCh between 20 and 40 % to sand. The maximum
shear modulus (Gmax) of the STCh mixture was determined by bender element tests for
different gravimetric proportions of TCh and effective confining pressures. The initial shear
modulus has been found to be influenced by the proportion of TCh and confining pressure.
The shear modulus degradation and damping ratio curves were developed for dynamic
analysis of sand-scrap tyre mixtures. The increase of scrap tyre in sand-scrap tyre mixtures
reduced the shear modulus degradation and increased the damping ratio.