Abstract In view of its appropriate engineering properties and environmental benefits, waste rubber is being increasingly used in engineering applications. Along with static loading, clay-rubber mixture (CRM) can be also utilized under dynamic loading. Due to a lack of detailed research on dynamic and static properties of CRMs, the effects of 0–30% rubber content on geotechnical properties of clay soil (CS) was investigated in this study through strain-controlled monotonic and cyclic triaxial tests. Moreover, the structure of the CRM and pure rubber was observed under a binocular microscope. The results indicated the effects of rubber size, rubber content, and shear strain amplitude on strength, volumetric strain, damping ratio, and shear modulus of the CRM. The results correspondingly demonstrated a good cohesion between clay and rubber grains as well as an appropriate strength and shear strain for the given mixture. According to the results of the dynamic tests, the highest damping ratio was obtained with 10% rubber content. In addition, the shear modulus showed a downward trend as the rubber content and the shear strain amplitude augmented. The use of rubber powder rather than granular rubber also enhanced the damping ratio by 10% on average. In contrast, the granular rubber boosted the shear modulus by 13% as compared with the rubber powder. Based on the results, it is recommended to use 10% rubber powder in executive operations to achieve the highest damping ratio. Considering the static strength of the CRM and its good damping ratio under cyclic loading compared with pure soil, it is suggested to be used in situations wherein soil could be subjected to low compressive loads combined with cyclic loading.

中文翻译：

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用循环三轴仪研究粘土与废橡胶混合的动态剪切模量和阻尼比

摘要 鉴于其适宜的工程性能和环境效益，废橡胶越来越多地用于工程应用。除了静态载荷外，粘土-橡胶混合物 (CRM) 还可以在动态载荷下使用。由于缺乏对 CRM 的动态和静态特性的详细研究，本研究通过应变控制的单调和循环三轴试验研究了 0-30% 橡胶含量对粘土（CS）岩土特性的影响。此外，在双目显微镜下观察了CRM和纯橡胶的结构。结果表明橡胶尺寸、橡胶含量和剪切应变幅度对 CRM 的强度、体积应变、阻尼比和剪切模量的影响。结果相应地证明了粘土和橡胶颗粒之间的良好内聚力以及给定混合物的适当强度和剪切应变。根据动态试验结果，橡胶含量为 10% 时阻尼比最高。此外，随着橡胶含量和剪切应变幅值的增加，剪切模量呈下降趋势。使用橡胶粉而不是颗粒橡胶也使阻尼比平均提高了 10%。相比之下，粒状橡胶的剪切模量比橡胶粉末提高了 13%。根据结果​​，建议在执行操作中使用10%的橡胶粉，以达到最高的阻尼比。考虑到 CRM 的静强度及其在循环载荷下与纯土相比具有良好的阻尼比，