Abstract
Adding rubber into sands has been found to improve the mechanical behavior of sands, including their dynamic properties. However, ambiguous and even contradictory results have been reported regarding the dynamic behavior of sand–rubber mixtures, particularly in terms of the damping ratio. A series of cyclic triaxial tests were, therefore, performed under a large range of shear strains on sand–rubber mixtures with varying rubber volume contents, rubber particle sizes, and confining pressures. The results indicate the dynamic shear modulus decreases with increasing rubber volume content and with decreasing particle size and confining pressure. The relationship of the damping ratio to the evaluated parameters is complicated and strain-dependent; at shear strains less than a critical value, the damping ratio increases with increasing rubber volume content, whereas the opposite trend is observed at greater shear strains. Furthermore, sand–rubber mixtures with different rubber particle sizes exceed the damping ratio of pure sand at different rubber volume contents. A new empirical model to predict the maximum shear moduli of mixtures with various rubber volume contents, rubber particle sizes, and confining pressures is accordingly proposed. This study provides a reference for the design of sand–rubber mixtures in engineering applications.
Highlights
The quantity of used rubber tires is increasing every year
Laboratory experiments far conducted to investigate the dynamic behavior of sand–rubber mixtures have not been comprehensive
The dynamic shear modulus significantly decreases with increasing shear strain amplitudes less than 0.5%, slows at shear strains greater than 0.5%
Summary
Approximately 290 million old tires are discarded annually [1], approximately 40% of which are disposed in landfills or stockpiles without being effectively utilized [2,3,4]. This excessive accumulation threatens both environmental and human health [5,6]. The increasing volume of discarded rubber tires has garnered interest in developing new methods for reusing these materials [7,8,9], and motivated researchers to characterize the general geotechnical properties of sand–rubber mixtures [10,11,12,13,14,15,16,17,18,19,20]. Laboratory experiments far conducted to investigate the dynamic behavior of sand–rubber mixtures have not been comprehensive
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
