李   伟¹  ,  孙海燕¹  ,  赵   杨² ,  王    冉¹  ,  翁娅莲¹

(1 .  云南农业大学 水利学院 ，云南 昆明 650201 ;  2.  江苏大学 流体机械工程技术研究中心 ，江苏 镇江 212013)

摘   要 ：为研究氯化铵侵蚀作用下混凝土性能的劣化，将混凝土浸泡在 6 mol/L 氯化铵溶液中，测定混凝土 的力学性能 、侵蚀深度，通过计算侵蚀龄期下试件的含水率和饱和度来表征孔结构的变化，采用扫描电子显微 镜表征和分析试件内部物相变化以及形貌特征。结果表明：在氯化铵侵蚀环境下，随侵蚀时间的增加，混凝土的侵蚀深度逐渐增加，孔隙率增加显著；与标准养护环境相比，侵蚀初期混凝土的抗压强度增大，而侵蚀 60 ~  90 d 混凝土的抗压强度降低；侵蚀环境下混凝土的含水率明显增加，而试件饱和度却与之相反；氯化铵侵蚀混凝土内部生成的钙矾石和弗雷德尔盐是混凝土后期裂缝发展的主要原因。

关键词：氯化铵 ；加速侵蚀 ；力学性能 ；孔结构；微观结构

中图分类号：TU528          

文献标志码：A            

文章编号： 1005- 8249   (2024)  05- 0011- 06 

DOI:10. 19860/j.cnki.issn1005 - 8249.2024.05.003

LI Wei ¹  ,  SUN Haiyan¹  ,  ZHAO Yang² ,  WANG Ran¹  ,  WENG Yalian¹

(1 . College of Water Conservancy ,  Yunnan Agricultural University ,  Kunming 650201 ,  China;  2. Research  Center

of Fluid Machinery Engineering and Technology ,  Jiangsu University ,  Zhenjiang 212013 ,  China)

Abstract：In order to study the deterioration of concrete performance under the action of ammonium chloride erosion, the concrete was immersed in 6 mol / L ammonium chloride solution, and the mechanical properties and erosion depth of the concrete were measured. The changes of pore structure were characterized by calculating the water content and saturation of the specimens under the erosion age. The internal phase changes and morphological characteristics of the specimens were characterized and analyzed by scanning electron microscopy. The results show that in the environment of ammonium chloride erosion, with the increase of erosion time, the erosion depth of concrete increases gradually, and the porosity increases significantly. Compared with the standard curing environment, the compressive strength of concrete at the initial stage of erosion increases, while the compressive strength of concrete at 60 ~ 90 days of erosion decreases. The water content of concrete increases significantly under the erosion environment, while the saturation of the specimen is opposite. The erosion of ettringite and Friedel 's salt generated inside the concrete by ammonium chloride is the main reason for the development of cracks in the later stage of concrete.

Keywords :  ammonium chloride;  accelerated erosion;  mechanical properties;  pore  structure;  microstructure

*基金项目： 云南省教育厅科研基金项目  (2024J0446) ;  云南农业大学科技创新创业行动基金项目  (2022ZKY373) 。 

作者简介：李   伟  (1994—) , 男 ，硕士研究生，研究方向：水工新材料。

通信作者：孙海燕  (1979—) , 女，博士，副教授，研究方向：水工新材料。

收稿日期：2024- 01 - 19