文献类型：期刊文献

英文题名：Effect of macropores at the steel-concrete interface on localized corrosion behaviour of steel reinforcement

作者：Wen, Cheng[1];Tian, Yuwan[1];Mai, Zijie[1];Hu, Jiezhen[1];Wang, Gui[1]

机构：[1]Guangdong Ocean Univ, Guangdong Prov Ocean Equipment & Mfg Engn Technol, Sch Mech & Power Engn, Zhanjiang 524088, Peoples R China

年份：2022

卷号：129

外文期刊名：CEMENT & CONCRETE COMPOSITES

收录：SCI-EXPANDED(收录号：WOS:000793070900001)、、EI(收录号：20221411912049)、Scopus(收录号：2-s2.0-85127364895)、WOS

基金：Acknowledgements The authors acknowledge the support of the Natural Science Foun-dation of Guangdong Province, China (No. 2021A1515110382) and the Science and technology program of Zhanjiang (No. 2021E05005) .

语种：英文

外文关键词：Interface; Air bubble; Localized corrosion; Quantification

外文摘要：The steel-concrete interface determines the steel corrosion and the durability of concrete structures. In this paper, the relationship between macropores and localized corrosion is quantified, based on the natural deterioration of 5 wt% Cr steel reinforced mortar and laboratory tests of 5 wt% Cr steel in the saturated calcium hydroxide solution. The results show that, considering environmental factors with the same chloride content and water saturation, large interfacial macropores are always the weakest zones at which both corrosion initiation and propagation preferentially take place. The localized rate of steel corrosion (mm/year) increases linearly with the logarithm of the macropore volume (mu L), and the slopes are in the range of 0.05-0.11 depending on the chloride level. The weakened pH buffering effect of solid Ca(OH)2 at interfacial macropores is not the only reason for this phenomenon; the impacts of macropores and their volume on the electrochemical corrosion process are also significant. In small macropores, both cathodic and anodic polarizations are strengthened, and the thermodynamic driving force of the iron dissolution reaction is reduced.