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李   偉¹  ,  孫海燕¹  ,  趙   楊² ,  王    冉¹  ,  翁婭蓮¹

(1 .  云南農業大學 水利學院 ，云南 昆明 650201 ;  2.  江蘇大學 流體機械工程技術研究中心 ，江蘇 鎮江 212013)

摘   要 ：為研究氯化銨侵蝕作用下混凝土性能的劣化，將混凝土浸泡在 6 mol/L 氯化銨溶液中，測定混凝土 的力學性能 、侵蝕深度，通過計算侵蝕齡期下試件的含水率和飽和度來表征孔結構的變化，采用掃描電子顯微 鏡表征和分析試件內部物相變化以及形貌特征。結果表明：在氯化銨侵蝕環境下，隨侵蝕時間的增加，混凝土的侵蝕深度逐漸增加，孔隙率增加顯著；與標準養護環境相比，侵蝕初期混凝土的抗壓強度增大，而侵蝕 60 ~  90 d 混凝土的抗壓強度降低；侵蝕環境下混凝土的含水率明顯增加，而試件飽和度卻與之相反；氯化銨侵蝕混凝土內部生成的鈣礬石和弗雷德爾鹽是混凝土后期裂縫發展的主要原因。

關鍵詞：氯化銨 ；加速侵蝕 ；力學性能 ；孔結構；微觀結構

中圖分類號：TU528          

文獻標志碼：A            

文章編號： 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

*基金項目： 云南省教育廳科研基金項目  (2024J0446) ;  云南農業大學科技創新創業行動基金項目  (2022ZKY373) 。 

作者簡介：李   偉  (1994—) , 男 ，碩士研究生，研究方向：水工新材料。

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

收稿日期：2024- 01 - 19