酸性环境中富水充填材料腐蚀及劣化机理

发布时间：2019-05-06 07:20

【摘要】：为了研究酸性环境对富水充填材料的影响,通过强度检测、扫描电镜、能谱分析及X射线衍射(XRD)等实验手段,分析富水充填材料在酸性环境中浸泡后的宏观性能及微观结构变化,并探讨其腐蚀及劣化机理.结果表明:富水充填材料在p H值为1和3的盐酸溶液中浸泡180 d后抗压强度比标养28 d的强度分别降低88.8%和58%,在p H值为3的硫酸溶液中浸泡后降低68%,p H值为1的硫酸溶液中浸泡后强度降为零;微观实验结果显示随着富水充填材料在硫酸溶液中浸泡时间的延长,试件内部有二水石膏生成,盐酸溶液中试件仅在p H值为1的溶液中浸泡180 d后产生二水石膏;盐酸溶液对富水充填材料的腐蚀主要为H+中和作用下硬化体结构的溶解腐蚀,硫酸溶液对材料的腐蚀为硬化体结构的溶解腐蚀和石膏的膨胀腐蚀;硫酸溶液对富水充填材料的腐蚀作用强于盐酸溶液.
[Abstract]:In order to study the influence of acidic environment on water-rich filling materials, the experimental methods such as strength measurement, scanning electron microscopy, energy spectrum analysis and X-ray diffraction (XRD) were used. The macro-properties and microstructure changes of water-rich filling materials after immersion in acidic environment were analyzed, and the corrosion and deterioration mechanism were also discussed. The results showed that the compressive strength of water-rich filling material after soaking in hydrochloric acid solution with pH value of 1 and 3 for 180 days was 88. 8% and 58% lower than that of standard culture for 28 days, and that of rich-water filling material in sulfuric acid solution with pH value of 3 was reduced by 68% after soaking in sulfuric acid solution with pH value of 3. After soaking in sulfuric acid solution with pH value of 1, the strength decreased to zero; The microcosmic experiment results show that the dihydrate gypsum is formed in the specimen with the prolongation of immersion time in sulfuric acid solution, and the dihydrate gypsum is formed in hydrochloric acid solution only after soaking in the solution with pH value of 1 for 180 days, and the dihydrate gypsum is formed in hydrochloric acid solution after soaking in the solution with pH value of 1 for 180 days. The corrosion of hydrochloric acid solution to water-rich filling material is mainly the dissolution corrosion of hardened structure under H neutralization, and the corrosion of sulfuric acid solution to the material is dissolution corrosion of hardened structure and expansion corrosion of gypsum. The corrosion effect of sulfuric acid solution on water-rich filling material is stronger than that of hydrochloric acid solution.
【作者单位】：北京科技大学土木与环境工程学院;
【基金】：国家自然科学基金资助项目(51374036) “十二五”国家科技支撑计划资助项目(2012BAB08B02)
【分类号】：TD823.7

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