Chen Shengjin, Jiang Jie, Ou Xiaoduo, Tan Zhijie
Guangxi Hualan Geotechnical Engineering Co., Ltd., Nanning 530001, China.
School of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China.
Materials (Basel). 2023 Sep 7;16(18):6104. doi: 10.3390/ma16186104.
Based on the existing research results, this research team developed roadbed stabilized soil materials using nano-SiO synergistically modified red mud in order to study whether the strength of the stabilized soil materials meets the strength requirements of the roadbed materials, and at the same time, analyze its strength characteristics to make the feasibility of it being used as a roadbed material clear. Through different combination schemes, the effects of different nano-SiO and cement contents on the strength of the stabilized materials were explored. The test results show the following: In the synergistic modification of nano-SiO and cement, nano-SiO can significantly improve the early unconfined compressive strength of red mud-based stabilized soil. In the synergistic modification of nano-SiO, gypsum, and cement, the 7 d unconfined compressive strength of red mud-based stabilized soil is greater than 2 MPa, which meets the strength requirements of road base materials and shows the superiority of synergism. The nominal stress-strain curves are divided into five stages: compressed and compacted stage, elastic deformation stage, plastic deformation stage, damage deformation stage, and residual deformation stage. The macroscopic compressive damage pattern of the specimens shows that the modified red mud-based stabilized soil mostly exhibits brittle damage. Tests have shown that the strength of modified terracotta-based stabilized soil meets the requirements of roadbed strength.
基于现有研究成果，该研究团队利用纳米二氧化硅协同改性赤泥研制了路基稳定土材料，以研究稳定土材料强度是否满足路基材料强度要求，同时分析其强度特性，明确其作为路基材料的可行性。通过不同的组合方案，探讨了不同纳米二氧化硅和水泥含量对稳定材料强度的影响。试验结果表明：在纳米二氧化硅与水泥的协同改性中，纳米二氧化硅能显著提高赤泥基稳定土的早期无侧限抗压强度。在纳米二氧化硅、石膏与水泥的协同改性中，赤泥基稳定土的7d无侧限抗压强度大于2MPa，满足道路基层材料强度要求，显示出协同作用的优越性。名义应力-应变曲线分为压缩压实阶段、弹性变形阶段、塑性变形阶段、损伤变形阶段和残余变形阶段。试件的宏观压缩破坏模式表明，改性赤泥基稳定土大多表现为脆性破坏。试验表明，改性陶土基稳定土强度满足路基强度要求。
