Evolution of Biofilm and Its Effect on Microstructure of Mortar Surfaces in Simulated Seawater  

作　　者：荣辉 YU Chenglong 张颖 RONG Hui;YU Chenglong;ZHANG Ying(School of Materials Science and Engineering,Tianjin Chengjian University,Tianjin 300384,China;Tianjin Key Laboratory of Building Green Functional Materials,Tianjin Chengjian University,Tianjin 300384,China)

机构地区：[1]School of Materials Science and Engineering,Tianjin Chengjian University,Tianjin 300384,China [2]Tianjin Key Laboratory of Building Green Functional Materials,Tianjin Chengjian University,Tianjin 300384,China

出　　处：《Journal of Wuhan University of Technology(Materials Science)》2024年第1期234-243,共10页武汉理工大学学报（材料科学英文版）

基　　金：Funded by the National Natural Science Foundation of China (Nos. 52278269, 52278268, 52178264, 52108238);Tianjin Outstanding Young Scholars Science Fund Project (No. 22JCJQJC00020);State Key Laboratory of Green Building Materials Open Foundation (No. 2021GBM08)。

摘　　要：To explore the role of biofilm formation on the corrosion of marine concrete structures, we investigated the attachment of biofilm on mortar surfaces in simulated seawater and the influence of biofilm on the microstructure of mortar surfaces. The results show that the evolution of biofilm on mortar surfaces in simulated seawater is closely related to the corrosion suffered by the mortar, and the process of biofilm attachment and shedding is continuous and cyclical. It is found that the specimens in the absence of biofilm attachment are more severely eroded internally by the corrosive medium in simulated seawater than those in the presence of biofilm attachment. For the specimens without biofilm attachment, after 60 days, gypsum forms,and after 120 days, the number of pores in the mortar is reduced. In contrast, for the specimens in the presence of biofilm attachment, gypsum could only be detected after 90 days, and fewer pores are filled. Therefore, the formation of biofilm could delay the invasion of the corrosive medium into the interior of mortar during the evolution of biofilm on mortar surfaces, mitigating the corrosion of mortars in seawater.

关 键 词：biofilm attachment MORTAR sulfur-oxidizing bacteria GYPSUM simulated seawater MICROSTRUCTURE 

分 类 号：TG172[金属学及工艺—金属表面处理] P75[金属学及工艺—金属学]