Abstract
Sand-rubber mixtures has characteristics of light weight, cheap and environmental-friendly, thereby it has a great potential to be used in geotechnical engineering for sustainable development. Dynamic properties (i.e. shear modulus and damping ratio) of sand-rubber mixtures in a small range of shearing strain amplitudes (i.e. 10-6-10-4) were investigated in this study through a series of resonant column tests. The effects of shearing strain amplitude, confining pressure and rubber content on dynamic shear modulus (G), maximum dynamic shear modulus (Gmax), damping ratio (D) and dynamic shear modulus ratio G/Gmax of the mixtures were also discussed. Based on the analyses of the relationship among confining pressure, rubber content and Gmax, an empirical formula for predicting Gmax considering the effects of confining pressure and rubber content was also proposed. The model prediction agreed with the experimental results very well.
Highlights
With a rapid development of national economy, the number of cars is increased considerably, which leads to the proliferation of waste tires and other rubber byproducts
When the shear strain was in the range of 10-5-10-4, the dynamic shear modulus decreased with an increase in the dynamic shear strain
When the shear strain was greater than 10-4, the increase of the shear strain led to the greater the rate of attenuation of the dynamic shear modulus
Summary
With a rapid development of national economy, the number of cars is increased considerably, which leads to the proliferation of waste tires and other rubber byproducts. The need of recycling waste automobile tires for environmental protection lead civil engineering research community on contriving ways to reuse these materials in an innovative manner [2]. Recycled rubber tires or mixed with granular soils have been used as backfill, drainage or thermal-isolation materials in the last several years for geotechnical applications [3]. Rubber shred is considered as light material in sand-rubber mixtures. It has the advantages of light weight, high strength, high permeability, short construction period, waste recycling and environmental protection, resulting in a wide range of application in foundation engineering in developing countries for earthquake protection [5]. It is believed that seismic isolation using rubber-soil mixture (RSM) should be a feasible method, considering the excellent energy absorption capability of rubber
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