铁道科学与工程学报2025，Vol.22Issue(4)：1635-1646,12.DOI:10.19713/j.cnki.43-1423/u.T20240921
基于Weibull分布的氯氧镁水泥盐冻耦合损伤特性与可靠性分析
Weibull distribution-based salt-frost coupling damage characterization and reliability analysis of magnesium oxychloride cement
摘要
Abstract
In order to investigate the effect of highland barley straw ash(HBSA)on the resistance to salt-frozen coupled erosion of magnesium chloroxylate cement mortar(MOCM),salt-frozen coupled erosion tests were carried out on MOCM with different HBSA dosages.The damage patterns and deterioration characteristics of MOCM were reflected by the evaluation parameters of resistance to salt-frozen coupled erosion and combined with the analysis of the apparent morphology,and then the optimal dosage of HBSA was determined.Based on the low-field nuclear magnetic resonance technique(LF-NMR),the pore structure characteristics of MOCM during the resistance to salt-frozen coupled erosion were analyzed.Combined with thermogravimetric analysis(TG)and scanning electron microscope test(SEM),the microstructural compositions of MOCM were characterized,which revealed the intrinsic reasons for the influence of HBSA on the resistance to salt-frozen erosion performance of MOCM.Finally,the reliability analysis of the deterioration law of resistance to freezing and erosion performance of MOCM was carried out by using the Weibull distribution function.The results showed that MOCM exhibited the best resistance to salt-frozen coupled erosion performance when the HBSA doping was 10%,which was increased by 19%compared with that without HBSA.The doping of HBSA effectively improved the pore structure of MOCM,and significantly reduced the proportion of harmful pores and multi-harmful pores.When the doping of HBSA was 10%,a large number of M-S-H gels were generated in the MOCM,which filled a large number of harmful pores and enhanced the denseness of the matrix structure of the MOCM,thus improving the resistance to salt-frozen coupled erosion.According to the reliability analysis results of the Weibull distribution function,the reliability of MOCM mixed with 10%HBSA in the salt-freezing coupled erosion environment was significantly higher than that without HBSA.The results of the study provide a theoretical reference for the engineering applications of magnesium oxychloride cement(MOC)in the saline soil areas of the salt lakes.关键词
氯氧镁水泥/青稞秸秆灰/盐冻耦合侵蚀/孔隙特征/Weibull分布函数Key words
magnesium oxychloride cement/highland barley straw ash/salt-frost coupled erosion/pore characterization/Weibull distribution function分类
建筑与水利引用本文复制引用
欧阳浩,曹锋,郑明杰,乔宏霞,李双营..基于Weibull分布的氯氧镁水泥盐冻耦合损伤特性与可靠性分析[J].铁道科学与工程学报,2025,22(4):1635-1646,12.基金项目
教育部春晖计划自主合作研究基金资助项目(HZKY20220452) （HZKY20220452）
国家自然科学基金资助项目(52178216) （52178216）
青海省重点研发与转化计划(2022-QY-222) （2022-QY-222）
