Wang Guanci, Chen Shanling, Xia Minmin, Zhong Weilin, Han Xuegang, Luo Biao, Sabri Mohanad Muayad Sabri, Huang Jiandong
Yueyang Road and Bridge Group Co., Ltd., Yueyang 414021, China.
Department of Transportation of Hunan Province, Traffic Manufacturing Cost Management Station, Changsha 410116, China.
Materials (Basel). 2022 Jul 22;15(15):5114. doi: 10.3390/ma15155114.
In this study, the potential application of slag-fly ash-based geopolymers as stabilizers for soft soil in sulfate erosion areas was investigated to promote environmental protection and waste residue recycling. The changes in the physical and mechanical properties and microstructure characteristics of cement-stabilized soil/geopolymer-stabilized soil under sulfate erosion were comparatively studied through tests such as appearance change, mass change, strength development, and microscopic examination. The results show that the sulfate resistance of stabilized soil is significantly affected by the stabilizer type. In the sulfate environment, the cement-stabilized soil significantly deteriorates with erosion age due to the expansion stress induced by AFt, while the geopolymer-stabilized soil exhibits excellent sulfate resistance. The slag-fly ash ratio (10:0, 9:1, 8:2 and 7:3) is an important factor affecting the sulfate resistance of geopolymer-stabilized soils, and the preferred value occurs at 9:1 (G-2). When immersed for 90 d, the unconfined compressive strength value of G-2 is 7.13 MPa, and its strength retention coefficient is 86.6%. The N-A-S-H gel formed by the polymerization in the geopolymer contributes to hindering the intrusion of sulfate ions, thereby improving the sulfate resistance of stabilized soil. The research results can provide a reference for technology that stabilizes soil with industrial waste in sulfate erosion areas.
在本研究中，为促进环境保护和废渣回收利用，对矿渣-粉煤灰基地质聚合物作为硫酸盐侵蚀地区软土稳定剂的潜在应用进行了研究。通过外观变化、质量变化、强度发展和微观检查等试验，对比研究了水泥稳定土/地质聚合物稳定土在硫酸盐侵蚀下物理力学性能和微观结构特征的变化。结果表明，稳定剂类型对稳定土的抗硫酸盐性能有显著影响。在硫酸盐环境中，水泥稳定土由于钙矾石诱导的膨胀应力，随侵蚀龄期显著劣化，而地质聚合物稳定土表现出优异的抗硫酸盐性能。矿渣与粉煤灰的比例（10:0、9:1、8:2和7:3）是影响地质聚合物稳定土抗硫酸盐性能的重要因素，最佳值出现在9:1（G-2）。浸泡90 d时，G-2的无侧限抗压强度值为7.13 MPa，强度保留系数为86.6%。地质聚合物中聚合形成的N-A-S-H凝胶有助于阻碍硫酸根离子的侵入，从而提高稳定土的抗硫酸盐性能。研究结果可为硫酸盐侵蚀地区利用工业废渣稳定土壤的技术提供参考。
