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| DOI | 10.1016/j.cscm.2024.e03014 |
| Study on mechanical properties and microstructure of improved saline soil subgrade filler | |
| 发表日期 | 2024 |
| ISSN | 2214-5095 |
| 起始页码 | 20 |
| 卷号 | 20 |
| 英文摘要 | The harm of saline soil to infrastructure engineering is manifested in its collapsibility after immersion and corrosion of underground structure. The influence on engineering construction mainly depends on the physical properties, content, salinity and natural environment. To clarify the interrelation between the microstructure and mechanical properties of saline soils in cold region after improvement, the pile numbers K602+800, K603+832, K636+187, K642+997 on the highway from Qarhan to Golmud in the Qarhan Salt Lake District of the Qinghai-Tibet Plateau were selected for the mixed saline soil of chloride and sulfate SW-HC47(fine sand high chlorine saline soil), CL-HC17(silty viscous high chlorine saline soil), GF-HC37(breccia high chlorine saline soil), SF-HC38(fine sand high chlorine saline soil) was used as a research soil sample, and cement was added to improve it. Firstly, unconfined compression strength(UCS) was carried out for the improved saline soil with different proportions of cement (6%, 8%, 10%, 12%), and the optimal incorporation amount was clarified. Secondly, the improved specimen was scanned by electron microscopy, the interval estimation method was used to select the optimal magnification. Thirdly, Using the pore system and fracture system identification software Particles (Pores) and Cracks Analysis System(PCAS) and professional image processing software Image Pro-Plus, the microscopic analysis of porosity, average from factor and other parameters before and after soil improvement was carried out, The interrelation between the microscopic parameters and the UCS improved soil is determined by the gray correlation analysis. Finally, combining the tests and analyzing the influence of curing agent materials on the improvement effect of saline soil from a microscopic perspective. The results indicates: (1)The optimal magnification of different soil samples is different. The optimal magnification of SW-HC47 and SF-HC38 was 400 times. The optimal magnification of soil samples CL-HC17 and GF-HC37 is 200 times. (2)With the increase of the number of curing days from 7 days to 28 days, the proportion of large pores in the four improved soil samples decreased significantly. The porosity, average from factor and fractal dimension of the four cement improved soil samples decreased with the increase of curing days. The Probability entropy varies less. (3)Individual micro-parameters affect the UCS to different extents. |
| 英文关键词 | Cement-amended saline soil; Microstructure; Scanning electron microscopy; Unconfined compressive strength; Conservation age |
| 语种 | 英语 |
| WOS研究方向 | Construction & Building Technology ; Engineering ; Materials Science |
| WOS类目 | Construction & Building Technology ; Engineering, Civil ; Materials Science, Multidisciplinary |
| WOS记录号 | WOS:001199642000001 |
| 来源期刊 | CASE STUDIES IN CONSTRUCTION MATERIALS
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/305562 |
| 作者单位 | Lanzhou Jiaotong University; Lanzhou Jiaotong University |
| 推荐引用方式 GB/T 7714 | . Study on mechanical properties and microstructure of improved saline soil subgrade filler[J],2024,20. |
| APA | (2024).Study on mechanical properties and microstructure of improved saline soil subgrade filler.CASE STUDIES IN CONSTRUCTION MATERIALS,20. |
| MLA | "Study on mechanical properties and microstructure of improved saline soil subgrade filler".CASE STUDIES IN CONSTRUCTION MATERIALS 20(2024). |
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