Yan Xuerui, Xu Qi, Deng Miao, Sun Yanxia, He Xin, Dong Shengde, Ma Luxiang, Hai Chunxi, Zhou Yuan
College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, China.
College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu, China.
Sci Total Environ. 2024 Nov 15;951:175214. doi: 10.1016/j.scitotenv.2024.175214. Epub 2024 Aug 5.
In this study, magnesium oxysulfate cement (MOS) was used as a binder for curing loess. The changes in bulk density, porosity, mineral structure and microstructure of the consolidated loess were systematically studied and verified. The porosity decreased from 40.97 % in pure loess to 28.75 % in 13 % MOS solidified sample. Scanning electron microscopy, energy spectrum analysis and thermogravimetric analysis revealed that the addition of MOS binder resulted in the formation of hydrated products, including Mg(OH), MgO·mSiO·nHO (M-S-H), and 3Mg(OH)·MgSO·8HO (3·1·8 phase), which effectively filled the voids between the grains and facilitated strong bonding among them. After a curing period of 28 days, the compressive strength of loess stabilized with 13 % MOS exhibited an increase to 7.9 MPa. Moreover, following immersion in water for 24 h, the softening coefficient K remained at 0.66. Furthermore, after undergoing five cycles of freeze-thaw cycling, the rate of change in compressive strength R was only 6.3 %. All the results indicate that MOS exhibits promising potential as a binder for soil stabilization applications.
在本研究中，硫酸镁氧水泥（MOS）被用作黄土固化的粘结剂。系统地研究并验证了固结黄土的堆积密度、孔隙率、矿物结构和微观结构的变化。孔隙率从纯黄土中的40.97%降至13% MOS固化样品中的28.75%。扫描电子显微镜、能谱分析和热重分析表明，添加MOS粘结剂导致形成水合产物，包括Mg(OH)、MgO·mSiO·nHO（M-S-H）和3Mg(OH)·MgSO·8HO（3·1·8相），这些产物有效地填充了颗粒之间的空隙并促进了它们之间的强粘结。养护28天后，13% MOS固化的黄土抗压强度稳定增加至7.9 MPa。此外，在水中浸泡24小时后，软化系数K保持在0.66。此外，经过五次冻融循环后，抗压强度变化率R仅为6.3%。所有结果表明，MOS作为土壤稳定应用的粘结剂具有广阔的潜力。
