Small-Strain Shear Modulus and Damping Ratio of Sand-Rubber and Gravel-Rubber Mixtures |
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| Authors: | Anastasios Anastasiadis Kostas Senetakis Kyriazis Pitilakis |
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| Institution: | (1) Department of Civil Engineering, Laboratory of Soil Mechanics, Foundations and Geotechnical Earthquake Engineering, Aristotle University of Thessaloniki, P.O. Box 424, GR-541 24 Thessaloniki, Greece;(2) Department of Civil and Architectural Engineering, City University of Hong Kong, Hong Kong, Hong Kong;(3) Department of Civil Engineering, Aristotle University of Thessaloniki, Thessaloniki, Greece |
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| Abstract: | This study examines the small-strain dynamic properties of mixtures composed of sandy and gravelly soils with granulated tire
rubber in terms of shear modulus (GO), and damping ratio in shear (Dmin). Torsional resonant column tests are performed on dry, dense specimens of soil-rubber mixtures in a range of soil to rubber
particles size 5:1–1:10 and rubber content from 0 to 35% by mixture weight. The experimental results indicate that the response
of the mixtures is significantly affected by the content of rubber and the relative size of rubber to soil particles. Concering
the small-strain shear modulus, an equivalent void ratio is introduced that considers the volume of rubber particles as part
of the total volume of voids. Based on a comprehensive set of test results a series of equations were developed that can be
used to evaluate the shear modulus and damping ratio at small shear strain levels if the confining pressure, the content of
rubber by mixture weight, the grain size of soil and rubber particles, and the dynamic and physical properties of the intact
soil are known. |
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