Improving the Service Life of Bridge Concrete Structure of High-speed Railway Exposed to Marine Environment by Adding Nano Alumina-oxide
YANG Zhiqiang1,2 , WANG Zhen1,2, HUANG Fali1,2, YI Zhonglai1,2, JIANG Jinyang3,4,*
1 Railway Engineering Research Institute, China Academy of Railway Science Corporation Limited, Beijing 100081, China 2 State Key Laboratory for Track System of High-speed Railway, Beijing 100081, China 3 School of Materials Science and Engineering, Southeast University, Nanjing 211189, China 4 Jiangsu Key Laboratory of Construction Materials, Southeast University, Nanjing 211189, China
Abstract: Chloride-induced steel corrosion is one of the main deterioration mechanisms that lead to the durability issue of bridge concrete structures of high-speed railway exposed to marine environment. Improving the chloride resistance of concrete is the fundamental way to increase the service life of concrete structure. The development of nano technology and nano material provides a novel research direction towards higher performance concrete. In this work, the influence of nano alumina oxide (NA) on the chloride migration coefficient (DRCM) and natural diffusion properties of mortar were firstly investigated. Based on the chloride binding isotherms, the chloride diffusion model with binding parameters of concrete were established. Meanwhile, the influence of NA on service life of concrete structures under chloride environment was simulated. The results show that the chloride resistance of mortar can be improved with an appropriate content of NA. With a protective layer of 60 mm and an addition of 2wt%NA, the service life of bearing platform C45 concrete is increased from 68 years to 107 years. The addition of NA provides a novel technology for prolonging the service life of concrete structures of high-speed railway exposed to marine environment.
杨志强, 王振, 黄法礼, 易忠来, 蒋金洋. 纳米氧化铝提升海洋环境高速铁路桥梁混凝土结构服役寿命研究[J]. 材料导报, 2024, 38(7): 22060232-8.
YANG Zhiqiang, WANG Zhen, HUANG Fali, YI Zhonglai, JIANG Jinyang. Improving the Service Life of Bridge Concrete Structure of High-speed Railway Exposed to Marine Environment by Adding Nano Alumina-oxide. Materials Reports, 2024, 38(7): 22060232-8.
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2024, Vol. 38 
