Abstract
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The stockpiling of scrap tyres is a significant environmental hazard and has attracted ample
research attention to explore viable solutions to recycling and reuse of scrap tyres. The
authors have recently proposed a novel seismic isolation method using sand-tyre chips
(STCh) mixture for protecting buildings and infrastructure. Although the static properties of
STCh mixture have been extensively studied, the investigation on the dynamic properties of
the mixture has been limited. The dynamic properties of STCh mixture are important to its
application for seismic protection of infrastructure. This paper presents the dynamic
properties (shear modulus and damping ratio) of STCh mixture for medium to large range of
shear strain levels (0.15% to 0.5%). The effects of the level of cyclic shear strain, number of
cycles and effective initial confining pressure have been investigated. The dynamic properties
of STCh mixture presented in this paper will also be essential for the application of the
mixtures in other civil engineering projects.