Strength Evolution Patterns and Degradation Mechanisms of Modified Waste Slag Filler Subgrade Under Dry-Wet Cycling Conditions
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摘要: 以改性废渣(RGM)固化土为对象,探究其在干湿循环条件下的强度演变规律与劣化机理。通过干湿循环试验、无侧限抗压强度测试、微观结构分析(SEM、XRD)及浸泡液化学性质监测,系统对比了RGM固化土与普通硅酸盐水泥(PC)基固化土及素土的耐久性差异。结果表明:RGM固化土在6次干湿循环后仍保持结构完整性,强度损失率(5.65%)显著低于PC基固化土(64.08%),这归因于其水化产物(托贝莫来石、C-A-S-H凝胶)的高稳定性及二次固化效应。微观分析表明,RGM固化土通过胶结物填充孔隙、增强颗粒间黏结力来延缓劣化,但随着循环次数增加,干湿应力导致微裂缝扩展及胶凝体分解,最终引发结构破坏。浸泡液pH值下降与钙离子(Ca2+)浓度动态变化进一步验证了水化产物溶解与反应进程。研究表明,RGM固化土在路基工程中具有抗干湿循环的潜力,其劣化机理为反复膨胀-收缩应力累积与水化产物化学稳定性降低的耦合作用。Abstract: This study investigated the strength evolution patterns and degradation mechanisms of modified red mud-based grouting material (RGM)-solidified soil under wet-dry cycling conditions. Through wet-dry cycling tests, unconfined compressive strength measurements, microstructural analyses (SEM, XRD), and monitoring of soaking solution chemistry, the durability differences among RGM-solidified soil, ordinary Portland cement (PC)-based solidified soil, and untreated soil were systematically compared. The results indicated that RGM-solidified soil maintained structural integrity after six wet-dry cycles, with a significantly lower strength loss rate (5.65%) than that of PC-based solidified soil (64.08%). This superiority was attributed to the high stability of RGM hydration products (tobermorite and C-A-S-H gels) and its secondary solidification effect. Microstructural analysis revealed that RGM-solidified soil mitigated degradation by filling pores with cementitious materials and enhancing interparticle bonding. However, accumulated wet-dry stresses eventually caused microcrack propagation and decomposition of the cementitious phase as the number of cycles increased, leading to structural failure. Dynamic variations in soaking solution pH and calcium ion concentration further confirmed hydration product dissolution and reaction progression. The research demonstrates the potential of RGM-solidified soil as a subgrade filler resistant to wet-dry cycling, with degradation mechanisms arising from coupled effects of cyclic swelling-shrinkage stress accumulation and reduced chemical stability of hydration products.
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Key words:
- modified waste slag /
- wet-dry cycling /
- subgrade filler /
- strength evolution /
- degradation mechanism
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[1] 李超华,陈爱军,蔡建军,等. 螯合飞灰用作路基填料的工程特性[J/OL]. 土木与环境工程学报(中英文),2026[ 2026-06-29]. https://link.cnki.net/urlid/50.1218.TU.20240730.1134.004. [2] 卢进,赵国权,张铮,等. 钢渣基胶凝材料在土壤固化中的应用研究[J]. 新型建筑材料,2024,51(6):101-104. [3] 唐先习,张徐军,李昊杰. 钢渣-煤矸石地聚合物固化黄土的力学特性评价与固化原理分析[J]. 岩土力学,2025,46(4):1205-1214. [4] 余光垒,李亮,征西遥,等. 矿渣-粉煤灰基地质聚合物固化铅污染土冻融特性研究[J]. 材料导报,2026,40(2):98-104. [5] 金胜赫,王修山,吴越鹏. 矿渣-脱硫石膏-电石渣固化剂固化黏土的研究[J]. 工程地质学报,2023,31(2):397-408. [6] 郭沁颖,李白云,丁建文,等. 工业废渣改良泥水盾构渣土的路用性能试验研究[J]. 土木与环境工程学报(中英文),2025,47(2):66-75. [7] 陈康,刘先峰,蒋关鲁,等. 干湿循环下石灰改良红层泥岩填料力学性能劣化规律研究[J]. 岩土力学,2025,46(1):43-54. [8] 徐学翔,张艳美,马丁,等. 干湿循环作用下纳米SiO2-石灰改良黄泛区粉土的累积变形特性[J]. 工业建筑,2023,53(增刊2):536-540. [9] 王协群,刘宁,李智奇,等. 干湿循环作用下氯氧镁水泥基多相胶凝材料改性固化淤泥的水力-力学特性[J]. 岩土工程学报,2023,45(10):2004-2013. [10] 赵献辉,王浩宇,周博宇,等. 粉煤灰基地聚物的性能影响因素及其凝胶产物研究进展[J]. 硅酸盐通报,2021,40(3):867-876. [11] 崔建勤,周耀祖,周应庆,等. 煤矸石制备低碳生态胶凝材料的性能研究[J]. 新型建筑材料,2023,50(11):118-121. [12] 张军辉,陈莎莎,顾凡,等. 工业废弃料在路基改良中的应用综述[J]. 中国公路学报,2023,36(10):1-16. [13] 严立俊,杨俊杰,武亚磊,等. 基于全固废固化剂固化/稳定化赤泥的路基施工工艺研究[J]. 长沙理工大学学报(自然科学版),2025,22(3):23-36. [14] 赵亚婷,杨博,王笑风,等. 废渣固化赤泥路用材料的试验研究[J]. 武汉理工大学学报(交通科学与工程版),2025,49(5):1098-1102. [15] 王军,田云鹏,朱萧霄,等. 压滤泥饼再生料的路用性能试验研究[J]. 中国公路学报,2025,38(6):234-245. [16] 贾能,贺礼. 水玻璃激发矿渣粉改良铁路路基黄土性能研究[J]. 铁道科学与工程学报,2025,22(3):1039-1051. [17] 姜鹏,刘林,邹仁,等. 基于再生胶凝固化剂的季冻区路基固化土工程性能研究[J]. 铁道科学与工程学报,2025,22(2):636-648. [18] 孔坤锋,马杰,袁胜洋,等. 红层泥岩填料强度特性及石灰改良效果研究[J]. 工程科学与技术,2026,58(1):111-120. [19] 扈惠敏,郭雷,王博. 稻壳炭-石灰复合土的力学性能及微观机理研究[J]. 重庆交通大学学报(自然科学版),2025,44(3):57-64. [20] 纪小平,刘杰,董鑫泽,等. 用于稳定尾渣路基填料的飞灰地聚合物制备与性能研究[J]. 中国公路学报,2023,36(10):30-41. [21] 王盛年,苏俊,郭双枫,等. 地聚物稳定粗粒填料静动力学特性试验研究[J]. 岩土力学,2023,44(增刊1):350-363. [22] 何俊,吕晓龙,朱元军. 养护温度对碱渣-矿渣-电石渣固化淤泥强度性质的影响机制[J]. 水利水电科技进展,2023,43(5):58-65. [23] 焦艳军,唐春凌,吴潇,等. 页岩气热解油基钻屑残渣路基填料的制备及其性能研究[J]. 石油与天然气化工,2022,51(4):107-112. [24] 刘凤云,罗怀瑞,万旭升,等. 低温养护下电石渣激发偏高岭土基地聚物固化土力学特性及固化机制研究[J]. 岩土力学,2023,44(11):3151-3164. [25] LAI R,ZHANG Z,ZHANG Y,et al. Deterioration mechanism of loess from Ili valley region of China under wet and dry cycles:evidences from shear tests[J]. Frontiers in Earth Science,2023,11:1276461. [26] SHI F,WANG Q,WU L,et al. Durability analysis of industrial waste stabilized sludge subjected to dry–wet cycles and sulfate erosion[J]. Arabian Journal for Science and Engineering,2025,50(3):1615-1631. -
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