TEOS/IBTS涂层对海洋潮汐区混凝土微生物污损防护效果研究

doi:10.11902/1005.4537.2020.261

中国腐蚀与防护学报

2022, Vol. 42

Issue (1): 135-142 DOI: 10.11902/1005.4537.2020.261

研究报告

本期目录 | 过刊浏览

TEOS/IBTS涂层对海洋潮汐区混凝土微生物污损防护效果研究

刘珺¹, 耿永娟¹, 李绍纯¹(

), 徐爱玲², 侯东帅¹, 刘昂¹, 郎秀璐², 陈旭³, 刘国锋¹

^1.青岛理工大学土木工程学院青岛 266033
^2.青岛理工大学环境与市政工程学院青岛 266033
^3.中建西部建设股份有限公司新疆公司乌鲁木齐 830000

Protection Efficacy of TEOS/IBTS Coating on Microbial Fouling of Concrete in Marine Tidal Areas

LIU Jun¹, GENG Yongjuan¹, LI Shaochun¹(

), XU Ailing², HOU Dongshuai¹, LIU Ang¹, LANG Xiulu², CHEN Xu³, LIU Guofeng¹

^1.School of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China
^2.School of Environment and Municipal Engineering, Qingdao University of Technology, Qingdao 266033, China
^3.China Construction Western Construction Company Limited Xinjiang Company, Urumqi 830000, China

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摘要:

通过溶胶-凝胶法制备了正硅酸乙酯 (TEOS) 和异丁基三乙氧基硅烷 (IBTS) 复合乳液，并在混凝土表面构建TEOS/IBTS复合涂层，然后放置于海洋潮汐区开展生物污损试验。结果表明，TEOS/IBTS复合乳液使得混凝土表面具有长期的疏水效果，海洋微生物不易在其表面粘附，可有效抑制微生物膜的形成。高通量测序表明，涂覆TEOS/IBTS复合涂层降低了混凝土表面微生物的物种丰富度和群落多样性，特别是易导致混凝土腐蚀的脱硫细菌门 (Desulfobacterota) 和厚壁菌门 (Firmicutes) 的丰度水平明显减少，细菌群落结构得到改善。微观测试结果显示，TEOS/IBTS复合涂层改善了混凝土表面的微观结构，降低了混凝土的生物污损程度。

关键词 ：复合涂层, 海洋暴露, 微生物腐蚀, 硅烷, 混凝土

Abstract：

The composite emulsion of ethyl orthosilicate (TEOS) and isobutyltriethoxysilane (IBTS) was prepared by a sol-gel method. The TEOS/IBTS composite coating was applied on concrete surface, which then was placed on the marine tidal zone to experience biofouling process. The results show that the TEOS/IBTS composite coating provides a long-term hydrophobic effect on the concrete surface. Hence, it is difficult for marine microorganisms to adhere on the TEOS/IBTS composite coated concrete surface, thereby, the formation of a microbial membrane may be retarded. High-throughput DNA sequencing results show that the application of the TEOS/IBTS composite coating reduced the species richness and community diversity of microorganisms on the concrete surface. In particular, the abundance levels of Desulfobacterota and Firmicutes, which are prone to cause concrete corrosion, were significantly reduced. Furthermore, the bacterial community structure on concrete surface was improved. CLSM and SEM results show that the TEOS/IBTS composite coating improved the surface morphology and characteristics of the concrete, thereby reduced the fouling degree of the concrete in marine environment.

Key words： composite coatings marine exposure microbial corrosion silanes concrete

收稿日期: 2020-12-10

ZTFLH:

TU528

基金资助:国家自然科学基金(51778308);江苏省土木工程材料重点实验室开放基金(CM2016-06)

通讯作者: 李绍纯 E-mail: lishaochun@qut.edu.cn

Corresponding author: LI Shaochun E-mail: lishaochun@qut.edu.cn

作者简介: 刘珺，女，1996年生，硕士生

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引用本文:

刘珺, 耿永娟, 李绍纯, 徐爱玲, 侯东帅, 刘昂, 郎秀璐, 陈旭, 刘国锋. TEOS/IBTS涂层对海洋潮汐区混凝土微生物污损防护效果研究[J]. 中国腐蚀与防护学报, 2022, 42(1): 135-142.
Jun LIU, Yongjuan GENG, Shaochun LI, Ailing XU, Dongshuai HOU, Ang LIU, Xiulu LANG, Xu CHEN, Guofeng LIU. Protection Efficacy of TEOS/IBTS Coating on Microbial Fouling of Concrete in Marine Tidal Areas. Journal of Chinese Society for Corrosion and protection, 2022, 42(1): 135-142.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.261 或 https://www.jcscp.org/CN/Y2022/V42/I1/135

表1 混凝土配合比

图1 不同海洋暴露时间混凝土 (w/c=0.4) 表面照片

图2 混凝土 (w/c=0.4) 表面接触角和表面能变化

图3 混凝土生物膜在门水平细菌多样性的相对丰度

表2 混凝土表面的细菌α-多样性指数

图4 混凝土 (w/c=0.4) 表面生物膜的CLSM图像

图5 混凝土 (w/c=0.4) 表面活/死细胞的粘附面积百分比

图6 混凝土 (w/c=0.4) 表面微观形貌及EDS结果

图7 TEOS/IBTS复合乳液防污机理图

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