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Geomechanics and Engineering Volume 41, Number 1, April10 2025 (Special Issue) pages 115-127 DOI: https://doi.org/10.12989/gae.2025.41.1.115 |
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 open accessShear strength of crosslinked xanthan gum biopolymer treated sand-clay mixture |
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Jeong-Uk Bang, Minhyeong Lee, Dong-Yeup Park and Gye-Chun Cho
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| Abstract | ||
| Cr3+-crosslinked xanthan gum (CrXG) has emerged as a promising solution for enhancing moisture resilience, wet strength, and durability in biopolymer-soil treatment (BPST) applications. However, its shear strength behavior across diverse soil compositions remains insufficiently explored. This study investigates the shear strength characteristics of CrXG-soil composites, spanning from poorly graded sand to clayey silty sand using direct shear tests (DST) under varying moisture states (initially wet, dried, and re-submerged). The results show that CrXG treatment achieves optimal performance in pure sand at low confinement, with an increase in cohesion and a decrease in internal friction angle. Adding clay particles accelerates the crosslinking process, with CrXG-soil composite with 15% clay content (CSM15) demonstrating consistent shear strength improvements across all confining stresses due to agglomeration effects of the CrXG-clay matrix. XG-treated composites exhibit significant strength gains when dried but suffer severe strength losses upon re-submersion due to swelling. In contrast, CrXG-treated CSM15 retains shear strength across moisture states, demonstrating superior environmental resilience. These findings highlight the potential of CrXG-treated CSM15 for sustainable geotechnical applications, including slope stabilization and erosion control. | ||
| Key Words | ||
| biopolymer soil treatment; direct shear test; gel phase; sand-clay mixture; shear strength; xanthan gum | ||
| Address | ||
| Jeong-Uk Bang, Dong-Yeup Park and Gye-Chun Cho: Department of Civil and Environmental Engineering, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Republic of Korea Minhyeong Lee: Disposal Safety Evaluation Research Division, Korea Atomic Energy Research Institute, 111 Daedeok-daero 989beon-gil, Yuseong-gu, Daejeon 34057, Republic of Korea | ||