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Geomechanics and Engineering Volume 37, Number 5, Juen10 2024 , pages 443-452 DOI: https://doi.org/10.12989/gae.2024.37.5.443 |
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Maximum shear modulus of rigid-soft mixtures subjected to overconsolidation stress history |
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Boyoung Yoon and Hyunwook Choo
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| Abstract | ||
| The use of sand-tire chip mixtures in construction industry is a sustainable and environmentally friendly approach that addresses both waste tire disposal and soil improvement needs. However, the addition of tire chip particles to natural soils decreases maximum shear modulus (Gmax), but increases compressibility, which can be potential drawbacks. This study examines the effect of overconsolidation stress history on the maximum shear modulus (Gmax) of rigid-soft mixtures with varying size ratios (SR) and tire chip contents (TC) by measuring the wave velocity through a 1-D compression test during loading and unloading. The results demonstrate that the Gmax of tested mixtures in the normally consolidated state increased with increasing SR and decreasing TC. However, the tested mixtures with a smaller SR exhibited a greater increase in Gmax during unloading because of the active pore-filling behavior of the smaller rubber particles and the consequent increased connectivity between sand particles. The SR-dependent impact of the overconsolidation stress history on Gmax was verified using the ratio between the swelling and compression indices. Most importantly, this study reveals that the excessive settlement and lower Gmax of rigid-soft mixtures can be overcome by introducing an overconsolidated state in sand-tire chip mixtures with low TC. | ||
| Key Words | ||
| compressibility; maximum shear modulus; overconsolidation; rigid-soft mixtures; tire chip | ||
| Address | ||
| Boyoung Yoon: School of Civil and Environmental Engineering, 790 Atlantic Drive, N.W., Georgia Institute of Technology, Atlanta, GA 30332-0355, USA Hyunwook Choo: Department of Civil and Environmental Engineering, Hanyang University, Seoul 04763, Republic of Korea | ||